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The Second Schedule

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1 [THE SECOND SCHEDULE]

(See section 41 F)

PERMISSIBLE LEVELS OF CERTAIN CHEMICAL SUBSTANCES IN WORK ENVIRONMENT

 

PERMISSIBLE LIMITS OF EXPOSURE

Serial No.

SUBSTANCE

TIME-WEIGHTED AVERAGE CONTRACTION (8 HRS.)

SHORT-TERM EXPOSURE LIMIT (15 MIN)*
   

ppm

Mg./mg**

ppm

Mg./m3**

1

2

3

4

5

6

 

 

 

 

 

 

(1)

Acetaldehyde

100

180

150

270

(2)

Acetic acid

10

25

15

37

(3)

Acetone

750

1780

1000

2375

(4)

Acrolin

0.1

0.25

0.3

0.8

(5)

Acrylonitrile-Skin

2

4.5

-

--

(6)

Aldrin-skin

-

0.25

-

--

(7)

Allyl chloride

1

3

2

6

(8)

Ammonia

25

18

35

27

(9)

Aniline-Skin

2

10

-

-

(10)

Anisidine (o-p-isomers) Skin

0.1

0.5

-

-

(11)

Arsenic & soluble compounds (As)

-

0.2

-

-

(12)

Benzene (S.C.)

10

30

-

-

(13)

Beryllium & compound (as Be) (S,C)

-

0.002

-

-

(14)

Borontrifluride - C

1

3

-

-

(15)

Bromine

0.1

0.7

0.3

2

(16)

Butane

800

1900

-

-

(17)

2 - Butanone (Methyl Ethyl Ketene - MEEK)

200

590

300

835

(18)

N-Butyl acetate 150

710

200

950

-

(19)

N-Butylealcohol-Skin-C

50

150

-

-

(20)

Sce/tert, Butly acetate

200

950

-

-

(21)

Butyl mercaptan

0.5

1.5

-

-

(22)

Cadmium Dusts and salts (as Cd)

-

0.05

-

-

(23)

Calcium oxide

-

2

-

-

(24)

Carbaryl (Sevin)

-

5

-

-

(25)

Carbofuran (Furadan)

-

0.1

-

-

(26)

Carbon disolphide - Skin

10

30

-

-

(27)

Carbon monoxide

50

55

400

440

(28)

Carbon to tetrachloride-Skin (S.C.)

5

30

-

-

(29)

Chlordane - Skin

-

0.5

-

-

(30)

Chlorine

1

3

3

9

(31)

Chlorobenzene (Monochlorobenzene)

75

350

-

-

(32)

Chloroform (S.C.)

10

50

-

-

(33)

bis (Chronometry) ether (H.C.)

0.001

0.005

-

-

(34)

Chromic acid and chromates (as Cr)

-

0.05

-

-

(35)

Chromous salts (as Cr)

-

0.05

-

-

(36)

Copper Fume

-

0.2

-

-

1.SUBSTITUTED BY S.O. 170(E), DATED 2ND MARCH, 1989, PUBLISHED IN THE GAZETTE OF INDIA, EXTRY., NO. 107, DATED 2-3-1989, PT. II, SEC 3(II) P. 6.

1

2

3

4

5

6

(37)

Cotton dust, raw *

-

0.2*

-

-

(38)

Cresol, all isomers-Skin

5

22

-

-

(39)

Cyanides (as CN)-Skin

-

5

-

-

(40)

Cyanogen

-

10

20

-

(41)

DDT (Dichlorodiphenyl trichloroethane)

-

1

-

-

(42)

Dometon-Skin

0.01

0.1

-

-

(43)

Diazinon-Skin

-

0.1

-

-

(44)

Dibutyl phthalate

-

5

-

-

(45)

Dichlorvos (DDVP)-Skin

0.1

1

-

-

(46)

Dieldrin-Skin

-

0.25

-

-

(47)

Dinitrobenzene (all isomers)-Skin

0.15

1

-

-

(48)

Trinitrotoluene-Skin

-

1.5

-

-

(49)

Diphenyl- (Biphenyl)

0.2

1.5

-

-

(50)

Endosulfan (Thiodan)-Skin

-

0.1

-

-

(51)

Endrin-Skin

-

0.1

-

-

(52)

Ethyl acetate

400

1400

-

-

(53)

Ethyl alcohol

1000

1900

-

-

(54)

Ethylamine

10

18

-

-

(55)

Fluorides (as F)

-

2.5

-

-

(56)

Fluorine

1

2

2

4

(57)

Formaldehyde (S.C.)

1.0

1.5

2

3

(58)

Formic acid

5

9

-

-

(59)

Gasoline

300

900

500

1500

(60)

Hydrazine-.Skin (S.C.)

0.1

0.1

-

-

(61)

Hydrogen chloride-C

5

7

-

-

(62)

Hydrogen cyamide-Skin-C

10

10

-

-

(63)

Hydrogen fluoride (as F)-C

3

2.5

-

-

(64)

Hydrogen peroxide

1

1.5

-

-

(65)

Hydrogen sulphide

10

14

15

21

(66)

Iodine-C

0.1

1

-

-

(67)

Iron-Oxide Fume (F°20)) (as Fe

-

5

-

-

(68)

Isoamyl acetate

100

525

-

-

(69)

Isoamyl alcohol

100

360

125

4500

(70)

Isobutyl alcohol

50

150

-

-

(71)

Lead, inorg, dusts and fumes (as Ph)

-

0.15

-

-

 

1

2

3

4

5

6

(72)

Lindane-Skin

-

0.5

-

-

(73)

Malathion-Skin

-

10

-

-

(74)

Manganese (as Mn) dust and compounds-C

-

5

-

-

(75)

Manganese fume (as Mn)

-

1

-

3

(76)

Mercury (as Hg)-Skin-

        

 

(i)

Alkyl compounds

-

0.01

-

0.03

 

(ii)

All forms except alkyl vapour

-

0.05

-

-

(77)

Aryl and inorganic compounds

-

0.1

-

-

(78)

Methyl alcohol (Methanol)-Skin

200

260

250

310

(79)

Methyl Cellosolve (2-Methoxyethanol) Skin

5

16

-

-

(80)

Methyl isobutyl ketone

50

205

75

300

(81)

Methyl isocyanate - Skin

0.02

0.05

-

-

(82)

Naphthalene

10

50

15

75

(83)

Nickel carbonyl (as Ni)

0.05

0.35

-

-

(84)

Nitric acid

2

5

4

10

(85)

Nitric oxide

25

30

-

-

(86)

Nitrobenzene-Skin

1

5

-

-

(87)

Nitrogen dioxide

3

6

5

10

(88)

Oil mist-mineral

-

5

-

10

(89)

Ozone

0.1

0.2

0.3

0.6

(90)

Parathion-Skin

-

0.1

-

  

(91)

Phenol-Skin

5

19

-

-

(92)

Phorate (Thimet)-Skin

-

0.05

-

0.2

(93)

Phosgene (Carbonyl chloride)

0.1

0.4

-

-

(94)

Phosphine

0.3

0.4

1

1

(95)

Phosphoric acid

-

1

-

3

(96)

Phosphorus (yellow)

-

0.1

-

-

(97)

Phosphorus pentachloride

0.1

1

-

-

(98)

Phosphorus trichloride

0.2

1.5

0.5

3

(99)

Picric acid-Skin

-

0.1

-

0.3

(100)

Pyridine

5

15

-

-

(101)

Silans (Silicon tetrahydride)

5

7

-

-

(102)

Sodium hydroxide -C

-

2

-

-

(103)

Styrene, monomer (phenylethylene)

50

215

100

425

(104)

Sulphur dioxide

2

5

5

10

(105)

Sulphur hexafluoride

1000

6000

-

-

 

1

2

3

4

5

6

(106)

Sulphuric acid

-

1

-

-

(107)

Tetraethyl lead (as Pb)-Skin

-

0.1

-

-

(108)

Toluene (Toluol)

100

375

150

560

(109)

  O - Toluidine - Skin (S.C.)

2

9

-

-

(110)

Tributyphosphate

0.2

2.5

-

-

(111)

Trichloroethylene

50

270

200

1080

(112)

Uranium, natural (as U)

-

0.2

-

0.6

(113)

Vinyl chloride (H.C.)

5

10

-

-

(114)

Welding fumes

-

5

-

-

(115)

Xylene (o-. m-, p-isomers)

100

435

150

655

(116)

Zinc oxide-

        
 

(i)

Fume

-

5.0

-

10

(ii)

Dust (Total dust)

-

10.0

-

-

(117)

Zirconium compounds (as Zr)

-

5

-

10

 

Ppm3    Parts of vapour or gas per million parts of contaminated air by volume at 25.C and 760 mm of Hg.

mg/m2 milligrams of substance per cubic metre of air.

*            

Not more than 4 times a day with at least 60 min. interval between successive exposures.

 

**          

                                Molecular weight            

mg/m2=               -----------------------------                xppm

                                  24.45    

G             denotes ceiling limit.

Skin   

denotes potential contribution to the overall exposure by the cutaneous route including mucous membranes and eye.

 

S.C.        denotes suspected human carcinogens.

H.C.        denotes confirmed human carcinogens.

 

Substance           Permissible time-weighted average concentration (TWA) (8 hours)

 

Silica, SiO2

(a)          Crystalline

                (i)            Quartz

                               

                                                          10600   

(1) In term of dusts count            -----------------------------                mppcm

                                                      %Quartz+l0

 

1

2

3

4

5

6

(106)

Sulphuric acid

-

1

-

-

(107)

Tetraethyl lead (as Pb)-Skin

-

0.1

-

-

(108)

Toluene (Toluol)

100

375

150

560

(109)

  O - Toluidine - Skin (S.C.)

2

9

-

-

(110)

Tributyphosphate

0.2

2.5

-

-

(111)

Trichloroethylene

50

270

200

1080

(112)

Uranium, natural (as U)

-

0.2

-

0.6

(113)

Vinyl chloride (H.C.)

5

10

-

-

(114)

Welding fumes

-

5

-

-

(115)

Xylene (o-. m-, p-isomers)

100

435

150

655

(116)

Zinc oxide-

        
 

(i)

Fume

-

5.0

-

10

(ii)

Dust (Total dust)

-

10.0

-

-

(117)

Zirconium compounds (as Zr)

-

5

-

10

Ppm3    Parts of vapour or gas per million parts of contaminated air by volume at 25.C and 760 mm of Hg.

mg/m2 milligrams of substance per cubic metre of air.

*            

Not more than 4 times a day with at least 60 min. interval between successive exposures.

 

**          

                                 Molecular weight            

mg/m2=               --------------------------------           xppm

                                      24.45    

G             denotes ceiling limit.

Skin       

denotes potential contribution to the overall exposure by the cutaneous route including mucous membranes and eye.

 

S.C.        denotes suspected human carcinogens.

H.C.        denotes confirmed human carcinogens.

 

Substance           Permissible time-weighted average concentration (TWA) (8 hours)

 

Silica, SiO2

(a)          Crystalline

                (i)            Quartz

                               

                                                          10600   

(1) In term of dusts count            -----------------------------                mppcm

                                                       %Quartz+l0        

 

 

(2)         

                                                               10          

In term of respirable dust            --------------------------------           mg/m2

                                                    respirable Quartz+2      

(3)         

                                               30          

In term of total dust       --------------------------------           mg/m2

                                           % Quartz+3        

                                (ii)           Cristobalite         Half the limits given against quartz

                                (iii)          Triovmite             Half the limits given against quartz

                                (iv)         Silica, fused        Same limits as for quartz

                                (v)          Tripoli    Same limit as in formula in item (2) given against quartz

(b)            Amorphous Silicate       10mg/m3, Total dust

                  Asbestos (H.C.)               *2 fibres/ml, greater than 5 urn in length and less than 3 um in breadth

                  Portland cement     

                                                        10 mg/m3, Total dust containing less than 1% quartz

 

Coal Dust 

                   2 mg/m3, respirable dust fraction containing less than 5% quartz

 

 

mppcm-Million particles per cubic metre of air based on impinger samples counted by light- field techniques.

 

*As determined by the membrane-fiter method at 400---

 

450 x megnification (4 mm objective) phase contrast illumination.

 

Respirable Dust:

Fraction passing a size-selector with the following characteristics:

 

Aerodynamic Diameter (u.m.) 
(Unit density sphere)

%passing sector

  VI 2

90

  2.5

75

  3.5

50

  5.0

25

  10

0
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