THE MINISTRY OF HEALTH
---------------- No. 10/2019/TT-BYT | THE SOCIALIST REPUBLIC OF VIETNAM
Independence - Freedom - Happiness
---------------- Hanoi, June 10, 2019 |
CIRCULAR
ON PROMULGATING THE NATIONAL TECHNICAL REGULATION ON PERMISSIBLE EXPOSURE LIMIT VALUE OF 50 CHEMICALS AT THE WORKPLACE
Pursuant to the Law on Occupational Safety and Health No. 84/2015/QH13 dated June 25, 2015;
Pursuant to the Law on Standards and Technical Regulations No. 68/2006/QH13 dated June 29, 2006;
Pursuant to the Government s Decree No. 127/2007/ND-CP dated August 01, 2007, on detailing the implementation of a number of articles of the Law on Standards and Technical Regulations;
Pursuant to the Government s Decree No. 75/2017/ND-CP dated June 20, 2017, on defining the functions, tasks, powers and organizational structure of the Ministry of Health;
At the proposal of the Director of the Health Environment Management Agency;
The Minister of Health shall hereby promulgate the National Technical Regulation on Permissible Exposure Limit Value of 50 Chemicals at the Workplace.
Article 1. National Technical Regulation on Chemicals
To issue together with this Circular the National Technical Regulation on Permissible Exposure Limit Value of 50 Chemicals at the Workplace - QCVN 03:2019/BYT.
Article 2. Effect
1. This Circular takes effect on December 09, 2019.
2. Occupational health standards for the following chemicals: Acetone; Acetic acid; Hydrochloric acid; Sulfuric acid; Ammonia; Aniline; Arsenic and arsenic compounds; Arsin; Benzene; n-Butanol; Cadmium and cadmium compounds; Carbon dioxide; Carbon disulfide; Carbon monoxide; Carbon tetrachloride; Chlorine; Chloroform; Chromium (III) compound; Water-soluble Chromium (VI); Chromium (VI) oxide; Cobalt and cobalt compounds; Dichloromethane; Copper (dust); Copper (fume); Ethanol; Fluorine; Fluoride; Formaldehyde; n-Hexane; Hydrogen cyanide; Hydrogen sulfide; Zinc oxide; Manganese and compounds; Methanol; Methyl acetate; Aluminum and compounds; Nicotine; Nitrogen dioxide; Nitrogen monoxide; Nitrobenzene; Nitrotoluene; Phenol; Selenium dioxide; Selenium and compounds; Sulfur dioxide; Toluene; 2,4,6-Trinitrotoluene; Vinyl chloride; Petrol and Xylene in the occupational health standard issued together with the Minister of Health’s Decision No. 3733/2002/QD-BYT dated October 10, 2020 shall cease to be effective from the effective date of this Circular.
Article 3. Implementation responsibility
Chief of the Ministry Office; Chief Inspector of Ministry; Directors and General Directors of the Health Environment Management Agency, Departments and Directorates of the Ministry of Health; heads of agencies and units of the Ministry of Health; Directors of Health Departments of provinces and centrally-run cities; heads of health agencies of ministries and branches, relevant organizations and individuals shall be responsible for the implementation of this Circular.
Any difficulties and troubles arising in the course of implementation shall be promptly reported to the Ministry of Health (the Health Environment Management Agency) for review and settlement./.
| FOR THE MINISTER
THE DEPUTY MINISTER
Nguyen Truong Son |
QCVN 03: 2019/BYT
NATIONAL TECHNICAL REGULATION ON PERMISSIBLE EXPOSURE LIMIT VALUE OF 50 CHEMICALS AT THE WORKPLACE
Preface
QCVN 03:2019/BYT is prepared by the Drafting Board for national technical regulations on occupational health, submitted by the Health Environment Management Agency, appraised by the Ministry of Science and Technology and promulgated together with the Circular No. 10/2019/TT-BYT dated June 10, 2019 by the Minister of Health.
NATIONAL TECHNICAL REGULATION ON PERMISSIBLE EXPOSURE LIMIT VALUE OF 50 CHEMICALS AT THE WORKPLACE
I. GENERAL PROVISIONS
1. Scope of regulation
This Regulation provides permissible exposure limit value of 50 chemicals at the workplace, including: Acetone; Acetic acid; Hydrochloric acid; Sulfuric acid; Ammonia; Aniline; Arsenic and arsenic compounds; Arsin; Benzene; n-Butanol; Cadmium and cadmium compounds; Carbon dioxide; Carbon disulfide; Carbon monoxide; Carbon tetrachloride; Chlorine; Chloroform; Chromium (III) compound; Water-soluble Chromium (VI) such as Hexavalent chromium; Chromium (VI) oxide; Cobalt and cobalt compounds; Dichloromethane; Copper and compounds (dust); Copper and compounds (fume); Ethanol; Fluorine; Fluoride; Formaldehyde; n-Hexane; Hydrogen cyanide; Hydrogen sulfide; Zinc oxide; Manganese and compounds; Methanol; Methyl acetate; Aluminum and compounds; Nicotine; Nitrogen dioxide; Nitrogen monoxide; Nitrobenzene; Nitrotoluene; Phenol; Selenium dioxide; Selenium and compounds; Sulfur dioxide; Toluene; 2,4,6-Trinitrotoluene; Vinyl chloride; Petrol and Xylene.
2. Subjects of application
This Regulation applies to state agencies managing working environment; agencies and organizations conducting working environment monitoring; organizations and individuals engaged in operations generating chemicals in the workplace air.
3. Interpretation of terms
In this Regulation, the following terms shall be construed as follows:
(Chemical names shall be specified in accordance with TCVN 5529: 2010 Chemical terms - Basic principle and TCVN 5530: 2010 Chemical terms - Nomenclature of chemical elements and compounds).
3.1.Acetone: is a colorless, flammable compound in the liquid or vapor form, with a mint-like aroma. Chemical formula: (CH3)2CO. IUPAC nomenclature is propanone. Other names: Acetona; dimethylformaldehyde; dimethylformehyde; dimethylketal; dimethyl ketone; ketone; ketone propane; β-ketopropane; methyl ketone; 2-propanone; propanone; pyroacetic acid; pyroacetic ether.
3.2.Acetic acid: is a colorless liquid or crystalline compound with a sour odor like vinegar. Chemical formula: CH3COOH. IUPAC nomenclature is acetic acid or ethanoic acid. Other names: 777 etch; glacial; acide acetique; acido acetic; aluminum etch 16-1-1-2; aluminum etch 82-3-15-0; micro-chrome etchant; copper, brass brite DIP 1127; dazzlens cleaner; essigsaeure; ethanoic acid; ethylic acid; freckle etch; glacial acetic acid (pure compound); glass etch; kodak 33 stop bath; kovar bright DIP (412X); KTI aluminum etch I/II; mae etchants; metal etch; methane carboxylic acid; poly etch 95%; vinegar (4 - 6% solution in water); vinegar acid; wet K-etch; wright etch.
3.3.Hydrogen chloride: is a colorless to light yellow liquid or vapor compound that has an unpleasant pungent odor. Chemical formula: HCl. IUPAC nomenclature is hydrochloric acid. Other names: Hydrogen chloride; muriatic acid; hydronium chloride; anhydrous hydrochloric acid.
3.4.Sulfuric acid: is a colorless to dark brown liquid or vapor compound. Chemical formula: H2SO4. IUPAC nomenclature is sulfuric acid. Other names: Hydrogen sulfate; dihydrogen sulfate; oil of vitriol; dipping acid.
3.5.Ammonia: is a colorless, strongly alkaline, and extremely soluble gas with a pungent odor. Chemical formula: NH3. IUPAC nomenclature is azane. Other names: Hydrogen nitride; trihydrogen nitride; nitrogen trihydride; am-fol; ammonia, anhydrous; ammoniac; ammonia gas; ammoniale; ammonium amide; ammonium hydroxide; anhydrous ammonia; aqua ammonia; daxad-32S; liquid ammonia.
3.6.Aniline: is a volatile liquid organic compound with the odor of rotten fish. Chemical formula: C6H5NH2. IUPAC nomenclature is phenylamine. Other names: Aniline; aminobenzene; benzenamine; aniline oil; anyvim; arylamine; benzeneamine; benzene, amino-; blue oil; huile d’aniline; phenylamine.
3.7.Arsenic and compound: chemical element and compound in the vapor or dust form. Chemical formula of arsenic: As. IUPAC nomenclature is arsenic. Inorganic compounds of arsenic including arsenic trioxide (AS2O3); arsenic pentoxide (AS2O5) and a number of salts of arsenic (excluding arsine). Other names of arsenic: Arsenic black; grey arsenic; ruby arsenic; metallic arsenic.
3.8.Arsine: is a colorless, flammable compound in the gas or vapor form, with a mild garlic odor. Chemical formula: AsH3. IUPAC nomenclature is arsenic trihydride. Other names: Arsenic hydride; hydrogen arsenide; arsenous hydride; arseniuretted hydrogen; arsenic anhydride.
3.9.Benzene: is a colorless, flammable and volatile compound in the liquid form, with a pleasant aromatic odor. Chemical formula: C6H6. IUPAC nomenclature is benzene. Other names: Benzol; benzole; phene; phenyl hydride; pyrobenzol.
3.10.N-Butanol: is a colorless compound in the liquid or vapor form, with an alcohol odor. Chemical formula: CH3(CH2)3OH. IUPAC nomenclature is butan-1-ol. Other names: N-butyl alcohol; 1-butanol; propylcarbinol; alcowipe; alpha 100 flux; alpha 850-33 flux; aqua-sol flux; avantine; boron B-30; boron B-40; boron B-50; boron B-60; burmar lab clean.
3.11.Cadmium and compounds: chemical element or compounds in the vapor fume or dust form. Chemical formula: Cd, CdO. IUPAC nomenclature of Cd is cadmium, IUPAC nomenclature of CdO is cadmium oxide. Other names of cadmium: Cadmio; colloidal cadmium; elemental cadmium; kadmium.
3.12.Carbon dioxide: is a colorless and odorless gas compound. Chemical formula: CO2. IUPAC nomenclature is carbon dioxide. Other names: Carbonic anhydride; acetylene black; elemental carbon.
3.13.Carbon disulfide: is a liquid or vapor compound with an ether-like odor. Chemical formula: CS2. IUPAC nomenclature is methanedithione. Other names: Carbon bisulfide; carbon sulfide; dithiocarbonic anhydride; schwefelkohlenstoff; sulphocarbonic anhydride; weeviltox.
3.14.Carbon monoxide: is a colorless, odorless and tasteless gas compound which is heavier than air. Chemical formula: CO. IUPAC nomenclature is carbon monoxide. Other names: Carbonic oxide; carbon oxide; kohlenmonoxid.
3.15.Carbon tetrachloride: is a colorless compound in the liquid or vapor form. Chemical formula: CCl4. IUPAC nomenclature is carbon tetrachloride. Other names: Benzinoform; carbona; carbon chloride; carbon tet; asciolin; flukoids; freon 10; halon 104; katharin; methane tetrachloride; methane tetrachloro-; necatorina; necatorine; perchloromethane; tetrachlorormethane.
3.16.Chlorine: is a colorless chemical element in the vapor form. Chemical formula: Cl2. IUPAC nomenclature is chlorine. Other names: Bertholite; chlore; chlorine molecular; chlorro; dichlorine; poly I gas.
3.17.Chloroform: is a colorless compound in the vapor form. Chemical formula: CHCl3. IUPAC nomenclature is trichloromethane. Other names: Chloroforme; cloroformo; formyl trichloride; freon 20; methane trichloride; methane, trichloro-; methenyl trichloride; methyl trichloride; R 20 refrigerant; trichloroform; trichloromethane.
3.18.Chromium (III) compounds: is a compound of chromium that has a valence of +3. Chemical formula: Cr3+.
3.19.Chromium (VI) compounds (water soluble): is a vapor, smoke or dust compound of chromium salts and compounds of +6 valence chromium which dissolves in water. Chemical formula: Cr+6. Other names: Hexavalent chromium (Chromium VI).
3.20.Chromium trioxide: is a dark red, odorless inorganic compound in the crystalline form, which dissolves in H2SO4, HNO3, (C2H5)2O, CH3COOH, (CH3)2CO. Chemical formula: CrO3. This is acid anhydride of chromic acid. IUPAC nomenclature is chromium trioxide. Other names: Chromic anhydride; chromic acid (misnomer).
3.21.Cobalt and compounds: metallic chemical element or compounds in the vapor fume or dust form. Metallic cobalt is a silver-gray to black solid. Chemical formula of cobalt: Co. IUPAC nomenclature is cobalt. Other names: Cobalt metal, cobalt (II), cobalt oxide.
3.22.Dichloromethane: is a colorless compound in the liquid or vapor form. Chemical formula: CH2Cl2. IUPAC nomenclature is dichloromethane. Other names: Methylene chloride; methane dichloride; methylene bichloride; methylene dichloride; dichloromethane; solmethine; narkotil; solaesthin.
3.23.Copper and compounds (dust): metal or copper compounds in the dust form. Chemical formula of copper: Cu. IUPAC nomenclature is copper. Other names of copper: 1721 gold; allbri natural copper; anac 110; arwood copper; bronze powder; C.I. pigment metal 2; cobre; copper bronze; elemental copper; gold bronze; kafar copper; M2 copper; Ml (copper); OFHC Cu; raney copper.
3.24.Copper and compounds (fume): metal or copper compounds in the fume form. Chemical formula: Cu, CU2O (copper oxide) and CuO (copper oxide fume).
3.25.Ethanol: is a colorless, volatile, flammable liquid compound. Chemical formula: CH3CH2OH. IUPAC nomenclature is ethanol. Other names: Ethyl alcohol; alcohol; ethylic alcohol.
3.26.Fluorine: is a yellow chemical element in the gas form, with a pungent odor. Chemical formula: F2. IUPAC nomenclature is fluorine. Other names: Fluorine-19; fluorues acide; saeure fluoride.
3.27.Fluorides: is a vapor or dust compound in the air that has an odor and color depends on specific compounds with fluorides. A fluoride is usually in the form of compound with alkali metals such as NaF (floridine). Chemical formula: F-or MxFyoride. IUPAC nomenclature is fluoride. Other names: Fluoride ion; fluoride (1-); perfluoride.
3.28.Formaldehyde: is a colorless and odorless gas compound with a pungent odor. Formaldehyde dissolving in water as a 37% solution named formalin or formol. Chemical formula: HCHO. IUPAC nomenclature is formaldehyde or methanal. Other names: Formalin; methyl aldehyde; methylene oxide; methylene glycol; formol; aldehyde formique; fannoform; formic aldehyde; oxymehylene.
3.29.n-Hexan: is a colorless, flammable and volatile compound in the liquid form, with a petrol-like odor. Chemical formula: CH3(CH2)4CH3. IUPAC nomenclature is hexane. Other names: Sextane; exxsol hexane; genesolv 404 azeotrope; gettysolve-B; n-hexano; hexano; hexyl hydride; skellysolve B.
3.30.Hydrogen cyanide: Is a colorless gas or pale-blue liquid compound with an almond-like odor. Chemical formula: HCN. IUPAC nomenclature is formonitrile. Other names: Hydrogen cyanide; methanenitrile; hydrocyanic acid; prussic acid; zyklon B. In military, AC stands for hydrogen cyanide.
3.31.Hydrogen sulfide: is a colorless compound in the liquid or vapor form, and smells like rotten eggs. Chemical formula: H2S. IUPAC nomenclature is hydrogen sulfide. Other names: Sulfur hydride; hydrothionic acid; dihydrogen monosulfide; dihydrogen sulfide; hydrogen sulfuric acid.
3.32.Zinc oxide: is a white or yellowish solid powder compound with no odor. Zinc oxide fume, vapor or dust is formed when being in the air. Chemical formula: ZnO. IUPAC nomenclature is zinc oxide. Other names: Zinc white; Chinese white; zincite; emar; catamine; zinc peroxide; zincoid.
3.33.Manganese and compounds: Metal chemical element and compounds of manganese. Manganese fume or dust is formed when being in the air. Chemical formula of manganese: Mn. IUPAC nomenclature is manganese. Other names of manganese: Colloidal manganese; cutaval; elemental manganese; manganese-55; manganese element; manganeso; tripart liquid; tronamag.
3.34.Methanol: is a colorless, flammable and volatile compound in the liquid form. Chemical formula: CH3OH. IUPAC nomenclature is methanol. Other names: Wood alcohol, methylol; wood spirit; carbinol; methyl alcohol.
3.35.Methyl acetate: is a liquid or vapor compound with an aromatic odor. Chemical formula: CH3COOCH3. IUPAC nomenclature is methyl acetate. Other names: Tereton; acetic acid methyl ester; methyl acetic ester; methyl ethanoate.
3.36.Aluminum and compounds: Metal chemical element with a silver color and compounds of aluminum. Aluminum fume or dust is formed when being in the air. Chemical formula of aluminum: Al. IUPAC nomenclature is aluminum. Other names of aluminum: Alaun; alumina fibre; aluminio; aluminium; aluminium flake; aluminum 27; aluminum dehydrated; aluminum, aluminum powder; metana; metana aluminum paste; noral aluminum; noral extra fine lining grade; noral nonleafing grade.
3.37.Nicotine: is a powdered or oily liquid compound with a light yellow to dark brown color and a slight fishy odor. Nicotine vapor, fume, or dust formed when being in the air. Chemical formula: C10H14N2. IUPAC nomenclature is (S)-3-[1-methylpyrrolidin-2-yl] pyridine. Other names: Black leaf; campbell’s nico-soap; destruxol orchard spray; di-tetrahydronicotyrine; emo-Nib; flux MAAG; fumeto-bac; mach-Nic; 1-methyl-2-(3-pyridyl)pyrrolidine; 3-(N-methylpyrrolidino) pyridine; (s)-3-(1-Methyl-2-pyrrolidinyl)pyridine; 3-(1-methyl-2-pyrrolidinyl) pyridine; (-)-3-(1-Methyl-2-pyrrolidyl)pyridine; 1-3-(1-methyl-2-pyrrolidyl) pyridine; 3-(1-methyl- 2-pyrrolidyl)pyridine; niagra P.A. dust; nicocide; nicodust; nicofume; nicotina; 1-nicotine; nicotine alkaloid; nikotin; orthon-4 dust; orthon-5 dust; pyridine, 3-(1-methyl-2-pyrrolidinyl)-; pyridine, (s)-3-(1-methyl-2-pyrrolidinyl)- and salts; pyridine, 3-(tetrahydro-1-methylpyrrol-2-yl); β-pyridyl-α-N-methylpyrrolidine; tendust.
3.38.Nitrogen dioxide: is a dark brown gas (above 21°C) or a yellow liquid (below 21°C), easily fuming, with a pungent odor. Chemical formula: NO2; N2O4. IUPAC nomenclature is nitrogen dioxide. Other names: Dinitrogen dioxide; dinitrogen dioxide, di-; dinitrogen tetroxide (N2O4); dioxido de nitrogeno; nitrogen peroxide; nitrogen tetroxide; nitrogen(IV) oxide, deutoxide of nitrogen.
3.39.Nitric oxide: is a colorless gas. Chemical formula: NO. IUPAC nomenclature is nitrogen monoxide; oxidonitrogen. Other names: Nitric oxide; bioxyde d’azote; monoxido de nitrogeno; oxido nitrico; oxyde nitrique; stickmonoxyd; nitrogen(II) oxide.
3.40.Nitrobenzene: is a liquid or vapor compound, insoluble in water with an almond-like odor, in a liquid form, it has a light yellow color. Chemical formula: C6H5NO2. IUPAC nomenclature is nitrobenzene. Other names: Nitrobenzol; nitrobenzole; oil of mirbane.
3.41.Nitrotoluene: Is a solid, liquid or vapor compound. Chemical formula: CH3C6H4NO2. Nitrotoluene has the following isomers: o, m and p. IUPAC nomenclature of o-nitrotoluene is 1-methyl-2-nitrobenzene, IUPAC nomenclature of m-nitrotoluene is 1-methyl-3-nitrobenzene, and IUPAC nomenclature of p-nitrotoluene is 1-methyl-4-nitrobenzene. Other names: Methylnitrobenzene; nitrotoluene; mixed isomers; 4-nitrotoluene; 3-nitrotoluene; 2-nitrotoluene; ortho-nitrotoluene.
3.42.Phenol: is a white, volatile, crystalline compound. Chemical formula: C6H5OH. IUPAC nomenclature is phenol. Other names: Acide carbolique; benzene hydroxy-; benzenol; carbolic acid; carbolsaure; fenol; hydroxybenzene; monohydroxybenzene; mono phenol; oxybenzene; phenic acid; phenole; phenyl alcohol; phenyl hydrate; phenyl hydroxide; phenylic acid; phenylic alcohol.
3.43.Selenium dioxide: is a white to slightly reddish crystalline compound or a yellow liquid or a yellowish-greenish vapor. Chemical formula: SeO2. IUPAC nomenclature is selenium dioxide. Other names: Selenium dioxide; selenium (IV) oxide; selenous anhydride; oxoselane oxide.
3.44.Selenium and compounds: chemical element and compounds with black or red color in a solid phase. The dust formed when selenium and compounds are in the air. Chemical formula of selenium: Se. IUPAC nomenclature is selenium. Other names of selenium: Colloidal selenium; elemental selenium; selenate; selenio; selenium (colloidal); selenium alloy; selenium base; elenium dust; selenium element; selenium homopolymer; selenium powder.
3.45.Sulfur dioxide: is a colorless compound in the vapor form. Chemical formula: SO2. IUPAC nomenclature is sulfur dioxide. Other names: Sulfurous oxide; sulfur oxide; sulfurous acid anhydride; sulfurous anhydride; sulfur (IV) oxide; bisulfite.
3.46.Toluene: is a colorless liquid with a pungent odor. Chemical formula: C6H5CH3. IUPAC nomenclature is toluene or methyl benzene. Other names: Antisal 1A; benzene, methyl-; methacide; methane, phenyl-; methylbenzol; phenylmethane; tolueno; toluol; tolu-sol; phenyl methane; anisen.
3.47.2,4,6 - Trinitrotoluene: is a yellow solid compound or vapor, dust compound. Chemical formula: C7H5N3O6. IUPAC nomenclature is 2-methyl-1,3,5-trinitrobenzene. Other names: Entsufon; 1-methyl-2,4,6-trinitrotoluen; α-TNT; TNT-tolite; tolit; tolite; toluene, 2,4,6-trinitro,-(wet); sym-trinitrotoluene; 2,4,6-trinitrotoluene; trinitrotoluene; trinitrotoluene, wet; s-trinitrotoluol; sym-trinitrotoluol; 2,4,6-trinitrotoluol; trinitrotoluol; tritol; trotyl; trotyl oil; trinol; 2,4,6-trinitromethylbenzene; tritolo.
3.48.Vinyl chloride: is a flammable, gaseous organic chlorine compound. Chemical formula: C2H3Cl. IUPAC nomenclature is chloroethene. Other names: Chloroethylene; ethene chloro-; vinyl chloride monomer; vinyl chloride monomer; ethenechloro- (vinylchloride); monochloroethylene; monochloroethene.
3.49.Petrol (Petrol distillates, gasoline): is a liquid or gas compound. Conventional petrol is a blend of more than 200 different hydrocarbons with the general chemical formula CnH2n+2from compounds containing 4 to 12 carbon atoms. Other names: Gasoline; petrol.
3.50.Xylene: is a colorless, volatile, fragrant liquid compound which is insoluble in water. Xylene contains a group of 3 isomers: octo-, meta-, and para- of dimethyl benzen. Chemical formula: C6H4(CH3)2. IUPAC nomenclature of o; m and p isomers is 1,2-dimethyl benzene; 1,3-dimethyl benzene and 1,4-dimethyl benzene, respectively. Other names: m-isomer: benzene, m-dimethyl-; benzene, 1,3-dimethyl-; m-dimethyl benzene; 1,3-dimethyl benzene; m-methyl toluene; m-xileno; m-xylene; 1,3-xylene; xylene, m-; m-xylol o-isomer: benzene-o-dimethyl; benzene-1,2-dimethyl-; o-dimethyl benzene; 1,2-dimethyl benzene; o-methyl toluene; 1,2-methyl toluene; o-xileno; o-xylene; 1,2-xylene; xylene, o-; o-xylol p-isomer: benzene-p-dimethyl; benzene-1,4-dimethyl; chromar; p-dimethyl benzene; 1,4-dimethyl benzene; p-methyl toluene; 4-methyl toluene; scintillar; p-xileno; p-xylene; 1,4-xylene; xylene, p-xylol.
3.51.Time weighted average (TWA) exposure limit: is the concentration value of an agent in the working environment air, averaged over the exposure time of 08 hours/shift, 40 hours/working week, and workers are not allowed to expose exceed this threshold.
The TWA exposure limit value is also used in case where there is no regulations on short term exposure limit (STEL) for one agent:
If the concentration in a work shift exceeds 03 times of the TWA value, the exposure duration with such concentration must not be longer than 30 minutes; during the work shift, the exposure concentration must not exceed 05 times of the TWA value, even the 8-hour TWA exposure does not exceed the TWA limit.
3.52.Short term exposure limit (STEL): is the concentration value of an agent in the working environment air, averaged over a period of 15 minutes and workers are not allowed to expose exceed this threshold.
If the agent concentration in the working environment falls within the TWA and STEL limits, the workers shall not be allowed to expose with such agent more than 15 minutes at a time, and more than 04 times in a work shift, provided that the interval between each exposure must be 60 minutes or more.
The short term exposure limit shall apply to chemicals likely causing: Irritation to skin and mucosa; central neutral system inhibition or stimulation; acute or subacute lesions; irreversible tissue lesions.
3.53.Measuring duration: means the duration for one time of measuring or taking chemical sample in a work shift.
3.54.Exposure duration: means the exposure duration with chemicals of the worker in a work shift.
3.55.Taking samples at a moment: means the measuring or taking chemical samples at a definite time, for a short period of at least 15 minutes.
3.56.Chemical abstracts service (CAS): Chemical registration number of the American Chemical Society.
3.57.IUPAC: International Union of Pure and Applied Chemistry.
3.58.IARC: International Agency for Research on Cancer. Based on the carcinogenicity, chemicals are classified into 05 groups by the IARC as follows:
- Group 1: Agent (mixture) carcinogenic to humans.
- Group 2A: Agent (mixture) probably carcinogenic to humans.
- Group 2B: Agent (mixture) possibly carcinogenic to humans.
- Group 3: Agent (mixture) not classifiable as to its carcinogenicity to humans.
- Group 4: Agent (mixture) probably not carcinogenic to humans.
II. GENERAL PROVISIONS
1. Permissible exposure limit value of chemicals at the workplace
Table 1. Maximum permissible exposure limit value of chemicals at the workplace.
Unit: mg/m3
No. | Chemical name | Chemical name in English | Chemical formula | Molecular mass | CAS registry number | TWA exposure limit (TWA) | STEL (STEL) | Toxicity group according to IARCMonographs |
1 | Aceton | Acetone | (CH3)2CO | 58.08 | 67-64-1 | 200 | 1000 | - |
2 | Acid acetic | Acetic acid | CH3COOH | 60.08 | 64-19-7 | 25 | 35 | - |
3 | Acid hydrochloric | Hydrogen chloride | HCl | 36.46 | 7647-01-0 | 5.0 | 7.5 | 3 |
4 | Acid sulfuric | Sulfuric acid | H2SO4 | 98.08 | 7664-93-9 | 1.0 | 2.0 | 1 |
5 | Amonia | Ammonia | NH3 | 17.03 | 7664-41-7 | 17 | 25 | - |
6 | Anilin | Aniline | C6H5NH2 | 93.13 | 62-53-3 | 4.0 | - | 3 |
7 | Arsenic và hợp chất | Arsenic and compound | As | 74.92 | 7440-38-2 | 0.01 | - | 1 |
8 | Arsin | Arsine | AsH3 | 77.95 | 7784-42-1 | 0.05 | - | 1 |
9 | Benzen | Benzene | C6H6 | 78.12 | 78,12 | 5.0 | 15.0 | 1 |
10 | n-Butanol | n-Butanol | C4H9OH | 74.12 | 71-36-3 | 150 | - | - |
11 | Cadmi và hợp chất | Cadmium and compounds | Cd CdO | 112.41 128.41 | 7440-43-9 1306-19-0 | 0.005 | - | 1 |
12 | Carbon dioxide | Carbon dioxide | CO2 | 44.01 | 124-38-9 | 9,000 | 18,000 | - |
13 | Carbon disulfide | Carbon disulfide | CS2 | 76.13 | 75-15-0 | 15 | 25 | - |
14 | Carbon monoxide | Carbon monoxide | CO | 28.01 | 630-08-0 | 20 | 40 | - |
15 | Carbon tetrachloride | Carbon tetrachloride | CCl4 | 153.84 | 56-23-5 | 10 | 20 | 2B |
16 | Chlor | Chlorine | Cl2 | 70.90 | 7782-50-5 | 1.5 | 3.0 | - |
17 | Chloroform | Chloroform | CHCl3 | 119.37 | 67-66-3 | 10 | 20 | 2B |
18 | Chromi (III) (dạng hợp chất) | Chromium (III) compounds | Cr3+ | 52 | 16065-83-1 | 0.5 | - | 3 |
19 | Chromi (VI) (dạng hòa tan trong nước) | Chromium (VI) compounds(water soluble) | Cr6+ | - | 1333-82-0 | 0.01 | - | 1 |
20 | Chromi (VI) oxide | Chromium trioxide | CrO3 | 99.99 | 1333-82-0 | 0.05 | - | 1 |
21 | Cobalt và hợp chất | Cobalt and compounds | Co | 58.93 | 7440-48-4 | 0.05 | - | 2B |
22 | Dichloromethan | Dichloromethane | CH2Cl2 | 84.93 | 75-09-2 | 50 | - | 2A |
23 | Đồng và hợp chất (dạng bụi) | Copper and compounds (dust) | Cu | 63.55 | 7440-50-8 | 0.5 | - | - |
24 | Đồng và hợp chất (dạng hơi, khói) | Copper and compounds (fume) | Cu CuO CuO2 | 63.55 79.55 95.55 | 7440-50-8 1317-38-0 1317-39-1 | 0.1 | - | - |
25 | Ethanol | Ethanol | CH3CH2OH | 46.08 | 64-17-5 | 1,000 | 3,000 | 1 |
26 | Fluor | Fluorine | F2 | 38.00 | 7782-41-4 | 0.2 | 0.4 | - |
27 | Fluoride | Fluorides | F- | 19.00 | 16984-48-8 | 1.0 | - | 3 |
28 | Formaldehyde | Formaldehyde | HCHO | 30.30 | 50-00-0 | 0.5 | 1.0 | 1 |
29 | n-Hexan | n-Hexane | CH3(CH2)4CH3 | 86.20 | 110-54-3 | 90 | - | - |
30 | Hydro cyanide | Hydrogen cyanide | HCN | 27.03 | 74-90-8 | 0.3 | 0.6 | - |
31 | Hydro sulfide | Hydrogen sulfide | H2S | 34.08 | 7783-06-4 | 10 | 15 | - |
32 | Kẽm oxide (dạng khói, bụi) | Zinc oxide (dust, fume) | ZnO | 81.37 | 1314-13-2 | 5.0 | - | - |
33 | Mangan và các hợp chất | Manganese and compounds | Mn | 54.94 | 7439-96-5 | 0.3 | - | - |
34 | Methanol | Methanol | CH3OH | 32.04 | 67-56-1 | 50 | 100 | - |
35 | Methyl acetat | Methyl acetate | CH3COOCH3 | 74.09 | 79-20-9 | 100 | 250 | - |
36 | Nhôm và các hợp chất | Aluminum and compounds | Al | 26.98 | 7429-90-5 | 2.0 | - | - |
37 | Nicotin | Nicotine | C10H14N2 | 162.23 | 54-11-5 | 0.5 | - | - |
38 | Nitơ dioxide | Nitrogen dioxide | NO2 | 46.01 | 10102-44-0 | 5.0 | 10 | - |
39 | Nitơ monoxide | Nitric oxide | NO | 30.01 | 10102-43-9 | 10 | - | - |
40 | Nitro benzen | Nitrobenzene | C6H5NO2 | 123.12 | 98-95-3 | 3.0 | - | 2B |
41 | Nitro toluen | Nitrotoluene | CH3C6H4NO2 | 137.15 | 99-99-0 99-08-1 88-72-2 | 11 | - | 3 3 2A |
42 | Phenol | Phenol | C6H5OH | 94.12 | 108-96-2 | 4.0 | - | 3 |
43 | Selen dioxide | Selenium dioxide | SeO2 | 110.96 | 7446-08-4 | 0.1 | - | 3 |
44 | Selen và các hợp chất | Selenium and compounds | Se | 78.96 | 7782-49-2 | 0.1 | - | 3 |
45 | Sulfur dioxide | Sulfur dioxide | SO2 | 66.06 | 7446-09-5 | 5.0 | 10 | 3 |
46 | Toluen | Toluene | C6H5CH3 | 92.15 | 108-88-3 | 100 | 300 | 3 |
47 | 2,4,6 - Trinitrotoluen (TNT) | 2,4,6 - Trinitrotoluene | C7H5N3O6 | 227.15 | 118-96-7 | 0.1 | - | 3 |
48 | Vinyl chloride | Vinyl chloride | C2H3Cl | 62.50 | 75-01-4 | 1.0 | - | 1 |
49 | Xăng | Petrol (Petrol distillates, gasoline) | CnH2n+2 | 99.99 | 8006-61-9; 89290-81-5 | 300 | - | 2A |
50 | Xylen | Xylene | C6H4(CH3)2 | 106 | 1330-20-7 | 100 | 300 | 3 |
2. Formula to convert the part per million (ppm) concentration of an analyzed substance (fume or gas) in the air into mg/m3concentration
In which:
- C (mg/m3): Analyzed substance concentration in the air is calculated by mg/m3.
- ppm: Analyzed substance concentration in the air with the measurement unit of ppm.
- Wm: Molecular weight of the analyzed substance.
- 24.45: Volume (liters) of a gas mole under a normal temperature and pressure condition (25°C and 1 atm).
3. TWA exposure limit value adjusted for the exposure duration with chemicals that is longer than 08 hours/day.
Such value is prescribed and calculated according to the following formula:
In which:
- TWAn: TWA exposure limit value adjusted for the exposure duration with chemicals that is longer than 08 hours/working day (mg/m3).
- TWA: TWA exposure limit value calculated by the exposure period of 08 hours/day (mg/m3) is specified in Table 1, corresponding to each type of chemical.
- h: The actual exposure hours in one day (h > 8).
4. TWA exposure limit value adjusted for the duration of exposure to chemicals exceeding 40 hours/working week.
Is calculated by the following formula:
TWAt= | 40 | x | (168 - H) | x TWA |
H | 128 |
In which:
- TWAt: TWA exposure limit value adjusted for the exposure duration of over 40 hours in a working week (mg/m3).
- TWA: TWA exposure limit value calculated on the basis of the exposure durations of 08 hours/day and 40 hours/working week (mg/m3) as prescribed in Table 1 that correspond to each chemical.
- H: The actual exposure duration (H>40) in a working week.
5. Method of calculation of the actual TWA exposure value.
5.1. In case the total measuring duration is equal to the total exposure duration, the TWA exposure value shall be calculated as follows:
The TWA exposure value shall be calculated as follows:
TWA = (C1.T1 + C2.T2 +...+ Cn.Tn) : T
In which:
- TWA: TWA exposure value (mg/m3).
- C1; C2;...; Cn: Actual concentrations (mg/m3) that are measured in the corresponding measuring duration T1;T2;...; Tn (minutes).
+ The acts of measuring, taking samples may be carried out once with the duration equal to the exposure duration in the work shift in cases of low chemical concentration.
+ The acts of measuring, taking samples may be carried out many times with different sampling and measuring durations depending on chemical concentrations at the measurement positions to avoid the overload of chemicals on filter papers or sampling tools, but ensuring that the total measuring duration is equal to the total exposure time.
- T: Total exposure duration (in minutes)
+ If the total exposure duration is 08 hours/day or less, the total exposure duration shall be calculated at 08 hours and T shall be equal to 480 (in minutes).
+ If the total exposure duration is over 08 hours/day, T shall be equal to the actual exposure duration.
The acts of measuring and taking samples can be carried out with a total measuring duration of at least 80% of the exposure duration. In this case, T shall be the total measuring duration (in minutes). And the exposure value in the remaining duration shall be deemed to be equivalent to the one in the measured duration.
For example: A worker or a group of workers are exposed to formaldehyde for 06 hours in an 8-hour workday; the measured average concentration in 06 hours is 0.8 mg/m3; in the 2 hours remaining, that worker or group of workers take a rest or perform other duties without exposing to formaldehyde. In this case, TWA shall be calculated as follows:
TWA = (0.8mg/m3x 6 hours + 0mg/m3x 2 hours): 8 hours = 0.6mg/m3
5.2. In case the total measuring duration is less than the total exposure duration, the TWA exposure value shall be calculated as follows:
For the evaluation of exposure in a work shift, it s best to measure and take samples in the whole shift with the total measuring duration equal to the total exposure duration. In case of limited human resources, equipment and production and working conditions, taking samples at moments shall be acceptable to assess the exposure in a work shift as follows:
Based on the manufacturing process, to predict each duration during which generation or release of chemicals is relatively stable, then to take a random representative sample for each of those durations. The number and lengths of time periods depend on the fluctuation of generation or release of chemicals during the work shift. In case the generation or release causing chemical pollution are expected to be relatively uniform during the work shift, the number of time periods can be equal to 2 (n = 2) with the same lengths of 1/2 of the total exposure duration.
The TWA exposure value shall be calculated as follows:
TWA = (C1.K1 + C2.K2 +...+ Cn.Kn) : T
In which:
- TWA: TWA exposure value (mg/m3).
- C1; C2; ...; Cn: Average concentrations (mg/m3) in the durations K1; K2;...; Kn (minutes).
- K1; K2;...; Kn: Durations in a work shift (minutes). The total of durations shall be equal to K1 + K2 + ... + Kn is the total time of a work shift.
- T: Total exposure duration (in minutes).
+ If the total exposure duration is 08 hours/day or less, the total exposure duration shall be calculated at 08 hours and T shall be equal to 480 (in minutes).
+ If the total exposure duration is over 08 hours/day, T shall be equal to the actual exposure duration.
The average concentration (C1; C2;...; Cn) in durations of a work shift shall be calculated according to the following formula:
Cx = (N1 + N2 +...+ Nn): n
In which:
- Cx: Average concentration in durations Kx (mg/m3) and X = 1; 2;...; n.
- N1; N2;...; Nn: Concentrations measured at the times 1, 2,..., n in the durations Kx (mg/m3).
- n: Total of samples measured at random in the durations Kx. (n>2)
The measuring durations of the sampling at moments must be equal.
For example: In one workshop, the initial survey showed that the release of ammonia was relatively uniform during the 8-hour work shift, to divide it into 02 durations (each duration is 04 hours). When taking the random measurement at 02 times representing the first 04 hours, 02 obtained values are 14 mg/m3and 13 mg/m3. When taking the one at 02 times representing the last 04 hours, 02 obtained values are 17 mg/m3and 18 mg/m3.
In this case, TWA shall be calculated as follows:
TWA = [(14 + 13)mg/m3: 2] x 4 hours + [(17 + 18)mg/m3: 2] x 4 hours]: 8 hours
= 15.5mg/m3
III. METHODS OF DETERMINATION
1.Technique for determination of acetone [(CH3)2CO] shall comply with Appendix 1 to this Regulation.
2.Technique for determination of acetic acid (CH3COOH) shall comply with Appendix 2 to this Regulation.
3.Technique for determination of hydrogen chloride (HCl) shall comply with Appendix 3 to this Regulation.
4.Technique for determination of sulfuric acid (H2SO4) shall comply with Appendix 4 to this Regulation.
5.Technique for determination of ammonia (NH3) shall comply with Appendix 5 to this Regulation.
6.Technique for determination of aniline (C6H5NH2) shall comply with Appendix 6 to this Regulation.
7.Technique for determination of arsenic (As) and compound shall comply with Appendix 7 to this Regulation.
8.Technique for determination of arsine (ASH3) shall comply with Appendix 8 to this Regulation.
9.Technique for determination of benzene (C6H6) shall comply with Appendix 9 to this Regulation.
10.Technique for determination of n-Butanol [(CH3(CH2)3OH] shall comply with Appendix 10 to this Regulation.
11.Technique for determination of cadmium (Cd) and compound shall comply with Appendix 11 to this Regulation.
12.Technique for determination of carbon dioxide (CO2) shall comply with Appendix 12 to this Regulation.
13.Technique for determination of carbon disulfide (CS2) shall comply with Appendix 13 to this Regulation.
14.Technique for determination of carbon monoxide (CO) shall comply with Appendix 14 to this Regulation.
15.Technique for determination of carbon tetrachloride (CCl4) shall comply with Appendix 15 to this Regulation.
16.Technique for determination of chlorine (Cl2) shall comply with Appendix 16 to this Regulation.
17.Technique for determination of chloroform (CHCl3) shall comply with Appendix 17 to this Regulation.
18.Technique for determination of chromium (III) compounds (Cr3+) shall comply with Appendix 18 to this Regulation.
19.Technique for determination of chromium (VI) compounds (water soluble, Cr+6) shall comply with Appendix 19 to this Regulation.
20.Technique for determination of chromium trioxide (CrO3) shall comply with Appendix 20 to this Regulation.
21.Technique for determination of cobalt (Co) and compounds shall comply with Appendix 21 to this Regulation.
22.Technique for determination of dichloromethane (CH2Cl2) shall comply with Appendix 22 to this Regulation.
23.Technique for determination of copper (Cu) and compounds (dust) shall comply with Appendix 23 to this Regulation.
24.Technique for determination of Copper (Cu) and compounds (fume) shall comply with Appendix 24 to this Regulation.
25.Technique for determination of ethanol (CH3CH2OH) shall comply with Appendix 25 to this Regulation.
26.Technique for determination of fluorine (F2) shall comply with Appendix 50 to this Regulation.
27.Technique for determination of fluorides (F-) shall comply with Appendix 26 to this Regulation.
28.Technique for determination of formaldehyde (HCHO) shall comply with Appendix 27 to this Regulation.
29.Technique for determination of n-Hexane [CH3(CH2)4CH3] shall comply with Appendix 28 to this Regulation.
30.Technique for determination of hydrogen cyanide (HCN) shall comply with Appendix 29 to this Regulation.
31.Technique for determination of hydrogen sulfide (H2S) shall comply with Appendix 30 to this Regulation.
32.Technique for determination of zinc oxide (ZnO) (dust, fume) shall comply with Appendix 31 to this Regulation.
33.Technique for determination of manganese (Mn) and compounds shall comply with Appendix 32 to this Regulation.
34.Technique for determination of methanol (CH3OH) shall comply with Appendix 33 to this Regulation.
35.Technique for determination of methyl acetate (CH3COOCH3) shall comply with Appendix 34 to this Regulation.
36.Technique for determination of aluminum (Al) and compounds shall comply with Appendix 35 to this Regulation.
37.Technique for determination of nicotine shall comply with Appendix 36 to this Regulation.
38.Technique for determination of nitrogen dioxide (NO2) shall comply with Appendix 37 to this Regulation.
39.Technique for determination of nitric oxide (NO) shall comply with Appendix 38 to this Regulation.
40.Technique for determination of nitrobenzene (C6H5NO2) shall comply with Appendix 39 to this Regulation.
41.Technique for determination of nitrotoluene (CH3C6H4NO2) shall comply with Appendix 40 to this Regulation.
42.Technique for determination of phenol (C6H5OH) shall comply with Appendix 41 to this Regulation.
43.Technique for determination of selenium dioxide (SeO2) shall comply with Appendix 42 to this Regulation.
44.Technique for determination of selenium (Se) and compounds shall comply with Appendix 43 to this Regulation.
45.Technique for determination of sulfur dioxide (SO2) shall comply with Appendix 44 to this Regulation.
46.Technique for determination of toluene (C6H5CH3) shall comply with Appendix 45 to this Regulation.
47.Technique for determination of 2,4,6 - Trinitrotoluene (TNT) shall comply with Appendix 46 to this Regulation.
48.Technique for determination of vinyl chloride (C2H3Cl) shall comply with Appendix 47 to this Regulation.
49.Technique for determination of petrol (CnH2n+2) shall comply with Appendix 48 to this Regulation.
50.Technique for determination of xylene [(CH3)2C6H4] shall comply with Appendix 49 to this Regulation.
51.Technique for determination of concentrations of chemicals in the air by using digital electronic measuring equipment shall comply with Appendix 50 to this Regulation.
52.Determination methods being national and international standards with the accuracy equivalent or higher than the above methods shall be acceptable. For specific situations and requirements, standards or other methods meeting defined requirements shall be acceptable.
IV. MANAGEMENT PROVISIONS
1.Establishments having employees exposed to chemicals shall organize the monitoring of chemicals in the working environment at least once a year and in accordance with the Labor Code and the Law on Occupational Safety and Health.
2.Employers must fully provide their employees with labor safety means in conformity with the working environment according to the law on occupational safety and health.
3.In case concentrations of chemicals at the workplace exceed the permissible limit value, employers must promptly carry out measures to improve working conditions and protect the employees’ health according to the law on occupational safety and health.
V. IMPLEMENTATION ORGANIZATION
1.The Health Environment Management Agency - the Ministry of Health shall assume the prime responsibility for, and coordinate with relevant authorities in, guiding, deploying and implementing this Regulation.
2.In case national and international standards, legal normative documents invoked in this Regulation are amended, supplemented or superseded, the amending, supplementing, superseding documents shall be applied.
* All Appendices are not translated herein.
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