Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 3025-49 (1994): Methods of sampling and test (physicaland chemical) for water and wastewater, Part 49: Zinc [CHD32: Environmental Protection and Waste Management]

June 1994

IS 3025 ( Part 49 ) : 1994( Reaffirmed 2003 )

~3tR~\jf()f(~~~)

~ ~~ (f~ tRtafUT~49~

( 4i5611 ~8ft1T )

Indian Standard

METHODS OF SAMPLING AND TEST( PHYSICAL AND CHEMICAL) FOR WATER

AND WASTEWATER

PART 49 ZINC

( First Revision)

Third Reprint SEPTEMBER 2()().J

UOC 628.1.032: 628.3 : 543.3 [546.47]

OBIS 1994

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEWDELHI 110002

Price Group 4

AMENDMENT NO. 1 OCTOBER 2000TO

IS 3025 ( PART 49) : 1994 METHODS OF SAMPLINGAND TEST (PHYSICAL AND CHEMICAL) FOR WATER

AND WASTEWATERPART 48 ZINC

( First Revisioll )

( Page 1, clause I ) - Insert the following new clause 8t the end of lindrenumber subsequent clauses:

·2I(E....ERENCES

2.1 The Indian Standards listed below contain provisrons which throughreference in tbis text. constitute provision of tbis standard. At tbe time ofpublication, tbe editions indicated were valid. All standards are subject torevision and parties to agreements based on this standards are encouraged toinvestigate the possibility of applying tbe most recent editions of tbe standardsindicated below:

IS No. Title

3025 (Part 1) : 1986 Methods of sampling and test (physical and chemical) forwater and wastewater : Part 1 Sampling (first revision)

7022 (Part 1) : 1973 Glossary of terms relating to water, sewage and industrialeffiuents: Part 1

7022 (Part 2) : 1979 Glossary of terms relating to water, sewage and industrialeffluents : Part II'

( Page 2, clause 4.4.3 ) - Insert the following 'Note' at the end of thisclause:

'NOTE - POlassium cyanide is a ~adly poison. Avoid skin contacl or inhalation ofvapours. Do nol pipette by mouth or brinl in contact with acids.'

( Page 2. ClQI4Se 4.4.4 ) - Substitute tbe following for tbe existing:

'4.4.4 Cyclohexanone Solution

Dissolve 1 ml of purified cyclobexanone in 50 011 of water.'

1

,Amend No.1 to IS JOZ5 ( Part 49 ) : 1994

( Page 2, cltllUe 4.5.1, liM 13 ) - Substitute 'cyclobexanone' for'cblorobexanonet •

(Page 2, claus« 4.5.1, line 14 ) - Delete tbe Collowing:

'(see 4.4.4 Note)'

(CnD 12)

Pnnted at New Indl. Pnntma Pre... Khul)a. Ind.a

2

Environmental Protection Sectional Committee, CHD 012

FOREWORD

This Indian Standard ( First Revision ) was adopted by the Bureau of Indian Standards, after thedraft finalized by the Environmental Protection Sectional Committee had been approved by theChemical Division Council.

Zinc is an essential and beneficial element in body growth. Concentration above 5 mg/l maycause a bitter astringent taste and opalescence in alkaline water. Zinc most commonly entersthe domestic water supply from deterioration of galvanized iron and dezincification of brass.Zinc in water may also come from industrial water pollution. In the preparation of this standardconsiderable assistance has been derived from American Standard Test Methods ( ASTM AnnualBook Section 1J, 1983) and Analytica Chimica Acta, 164 ( 1984) pp 1-21. The assistance soderived is thankfully acknowledged. This standard supersedes 17 of IS 2488 (Part 2 ) : 1968and 39 of IS 3025 : 1964.

In reporting the result of a test or analysis made in accordance with this standard, if the finalvalue, observed or calculated, is to be rounded off. it shall be done in accordance with IS 2 : 1960'Rules for rounding off numerical values ( revised )'.

The composition of the technical committee responsible for the formulation of this IndianStandard is given in Annex A.

IS 3025 ( Part 49 ) : 1994

Indian Standard

METHODS OF SAMPLING AND TEST( PHYSICAL AND CHEMICAL) FOR WATER

AND WASTEWATERPART 49 ZINC

( First Revision )4 ZINCON METHOD

4.1 PrlDel,l.

Zinc ( II) forms a soluble blue complex with2-carboxy-2-hydroxy-5-sulfoform-azyl benzene( zincon ) at pH 9-0. The coloured complexobeys Beer's law and is suitable for spectropho­tometric measurements.

4.3 Apparatul

4.3.1 Spec1rophotometer - for use at 620 nmwith I em cells.

4.4 ReageDts

4.4.1 Sodium Hydroxide Solution - 40 ./1.Dissolve 40 S of sodium hydroxide (NaOH)in SOO ml of water and make up to I litre.

Though many heavy metals react with zinconand interfere in the analysis, treatment of thesample as given in 4.5.1 with cyanide and chloro­hexanone masks many of the interfering metalions. The following ions interfere beyond theconcentrations given against each:

SJ No. Ion Concentration, mg]!i) Cd'+ 1

ii) All+ Siii) Mnl+ 5iv) Fe l + 7v) Fe l + 9

vi) Crl + 10vii) Nil + 20

viii) CUii- 30ix) COI+ 30x) CrO' SO

1 SCOPE

This standard prescribes following four methodsfor determination of zinc:

a) Zincon Method,

b) Atomic Absorption Method ( Direct ),c) Atomic Absorption Method (Chelation

and Extraction ), andThis method is applicable in the range from

d) Differential Pulse Anodic Stripping 0·02 -S mall of zinc.Voltammetry ( DPASV ).

4.% InterfereDeelDepending upon the concentration range andinterference levels, choice of the method ismade. When the concentration levels are below200 11'.1/1, preconcentration is carried out eitherby chelation and extraction prior to atomicabsorption spectrophotometer (AAS) or bydeposition on a mercury drop electrode as inDPASV method. For dissolved zinc content,filtration through 0·45 I'm membrane filter isrequired.

2 SAMPLING AND PRESERVATION

The sampling bottles shall be cleaned thoroughlywith dilute nitric acid ( 6 N ) prior to the finalrinsing with water_The water samples shouldbe collected and stored preferably in polypro­pylene or chemically resistant glals containers.Por preservation, the samples should be acidi­fied with concentrated nitric acid ( 2 ml of ARgrade of nitric acid in 1 litre just to bring downthe pH below 2). Unacidifted samples shouldbe analysed tho same day while the acidifiodsamples can be stored for a few days ( S days )in a refrigerator.

3 PURITY OF THE REAGENTS

3.1 Unless otherwise indicated. only AR/GRarade chemicals should be used for all the tests.

3.2 Double distilled water, with a specific con­ductivity of less than 1-0 "mho/em should beused for preparing the standards and reagentIOlutions.

1

IS 3025 ( Part 4' ) : 19M

4.4.2 Sodium H;ydroxide Solutio" - 240 Ill.

Dissolve 24 I of sodium hydroxide ( NaOH ) in25 ml of water. Dilute to 100 ml with water.

4.4.3 Potassium Cyanide Solution

Dissolve 1 g of potassium cyanide ( KeN) inSO ml of water and dilute to 100 ml.

~.4.4 Chlorohexanone Solution - purified.

Dissolve 10s of chlorohexanone CCl!4(OH).in 100 ml or water.

NOTE - As the reagents 4.4.3 and 4.4.4 arc poise..nous, they should b~ prepared in a fume hood andhandled with safety pipettes.

4.4.5 Zincoll SolutionDissolve 0·325 g of zincon reagent in 1~ rot of

, methanol by heating gently. Cool. DIlute to250. ml with methanol in a 250 ml standardflask. Store the reagent in a brown colouredbottle.

4.4.6 Sodium AscorbateNeeded only when manganese content is morethan 0·2 ppm.

4.4.7 Borate Buffer Solution

Dilute 213 ml of 1M NaOH solution to 509 mlwith water and dissove 37·3 g of potassiumchloride and 31 g of boric acid. Make up to1 litre in a standard flask.

4.4.8 Hydrochloric Acid - Concentrated.

4.4.9 Zinc ( 11) Solutions

Dissolve 0"274 Sg of zinc sulphate (ZnSO.·7H•O)in 200 ml of water and dilute to 1 litre. 1 ml -==0·1 mg of ze,4.5 Procedure

4.5.1 For dissolved zinc, filter the samplethrough 0-45 pm membrane filter paper- Fortotal zinc, add ] ml of concentrated hydrochlo­ric acid to SO ml or sample and boil for Sminutes. Cool the solution and adjust the pHto 7 with sodium hydroxide solution (4.4.1).Make up the solution to SO ml in a standardflask. Take 10 ml of this solution or the filtrate( in the case of dissolved zinc) in an Erlen­meyer flask. Add 0-5 g of sodium ascorbate,1 ml of cyanide solution, S ml of buffer solu­tion, 3 ml of zincon solution and I mI orchlorohexanone solution in the above orderwith sufficient precaution (aee 4.4•.f Note).Make up the solution to 500 mi. Prepare areagent blank by treating 50 ml of doubledistilled water in the same way as describedabove.

4.5.2 Measure the optical density of the samplesolution at 620 om against the reagent blankcontaining added zinc and prepared In thesame way except for the addition of 3 ml ofchloral hydrate.

4.5.3 Calibration

Treat 50 ml portions of standard solutions COD­taining 0·02, 0·05, 0·1, O-S,I·O. and '·0 millof zinc and treat as above and measure theabsorbance. Plot absorbance versus milligramof zinc for the standards to get a calibrationgraph. Read the" concentration of zinc in thesample from the calibration graph.

4.6 CalculatloB

Zinc. mg/l=~ x 1000

where

M = mass of zinc present in ml in thesample, and

V = volume of sample in mi.

5 ATOMIC ABSORPTION METIIOD(DIRECT )

5.1 Principle

The zinc content 9f the sample is determinedby atomic .absorption spectrophotometry. Fordissolved zinc, the filtered sample is directlyaspirated to the atomizer. For total recovera­ble zinc, an acid digestion procedure is doneprior to aspiration of the sample.

This method is applicable in the raDle from0-01 to 2·0 mg/l. However, the concentrationrange will vary with the sensitivity or theinstrument used-

S.2 IDterfereDeelCadmium, lead, copper, nickel, cobalt andchromium up to 10 mg/l do not interfere.Alkali and alkaline earth metals can be tolera­ted up to 4000 mg/l. Iron interferes at concent­rations or so mgll and above by suppressin, thozinc absorption.

S.3 Apparatus

S.3.t Atomic Absorption SpectrophDtom,te, withAir-Acetylene Flame

5.3.2 Multi-element hollow-cathode lamps orelectrodeless discharge lamps for use at213-8 nm.

5.4 Rea.eats

5.4.1 HydrochlorIc .Acid - Concentrated.

5.4.2 Nitric Acid - Concentrated.

2

5.4.3 Nitric Acid - Diluted ( 1 : 499 ).

5.~.4 Zinc ( II) SolutIo,.,

5•.c.4.1 Stock zinc ( 11 ) solution

Dissolve 1 g of acid washed and rinsed zincIfanules or 1·245 I of zinc oxide (ZnO) in20 ml or 1 : 1 nitric acid. Dilute to 1 : 1 withwater. 1 ml c= 1-0 mg of Zn.

5.4.~.2 Standard zinc ( 11) solution

Dilute tOO ml of zinc stock solution and 1 mlof nitric acid to 1 litre with water.

S.5 Procedare

5.5.1 Add 0·5 ml oC nitric acid to 100 ml ofthe sample (filtered or unfiltered). If totalrecoverable zinc is to be determined, add S mlof concentrated hydrochloric acid and filter thesample through acid washed filter paper. Makeup to 100 ml in a volumetric flask, aspirate thesolution and measure the absorbance at 213·8nm, Aspirate nitric acid (t : 499) prior tolample aspiration.

5.5.2 Prepare a reagent blank and sufficientstandards containing 0'01, O'OS, 0·1, O·S, 1·0and 2·0 mg/l of zinc by diluting suitable volumeof the standard solution with nitric acid( 1 : 499) and repeat as above. Aspirate thesolutions and measure the absorbance.

5.' CalealatioDI5.6.1 Construct a standard calibration graph byplotting the absorbance versus standard con­centration for each standard. Read the con­centration of the samples from the graph.

Zinc, mg/I-~x 1 000y

whereM == mass of zinc present in mg in the

sample, andJ' == volume of sample in ml.

, ATOMIC ABSORPTION METHOD( CHELATION - EXTRACTION)

'.1 Scope aDd ApplleaUoDZinc is cheIated with pyrrolidine dithio carba­mic acid and extracted with chloroform. Theextract is treated with hot nitric acid aftereyapor~tiDg to d~Y&less, d.issolved in hydrochlo­ne acid and diluted with water. An aliquotis aspirated into the air-acetylene flame of thespectrophotometer. For total recoverable zincan acid digestion procedure is done prior toaspiration of the sample.

This method is applicable for the concentrationrange from 1·200 ",a/I.

3

IS 3025 ( Part 49 ) : 1994

Nom - Tho lower faDIO 01 determination to theextent of 0·001 mill may be obtained by paphitesystem.

6.2 InterfereDcel - Same as in 5.2.

6.3 Apparatus - Same as in 5.3.

'.4 ReagenD

6.4.1 Hydrochloric Acid - Concentrated.

6.4.2 Hydrochloric Acid - Diluted ( 1 : 2 ).

6.4.3 Hydrochloric Acid - Diluted ( 1 : 49 ).

6.4.4 Nitric Acid - Concentrated.

6.4.5 Pyrrolidine Dithio Carbamic Ac id - Chlo­roform reagent:

36 ml of pyrrolidine is mixed with 1 litre ofchloroform. The solution is cooled and 30 mlof carbon disulphide is added in small fractionswith continuous stirring. Dilute with 1 litre ofchloroform and store in a cool and dark place.The reagent is stable for at least six months.

NOTE - Aa components of this mixture are hi.hlytoxic and flammable, prepare and ule in a fumehood.

6.4.6 Sodium Hydroxide Solution

Dissolve 100 g of sodium hydroxide in water anddilute to 1 litre with water.

6.4.7 Chloroform

6.4.8 Bromophenol Blue Indicator Solution

Dissolve 0'1 g of bromophenol blue in 100 ml ofSO percent ethanol or isopropanol.

6•.f.' Stock Zinc ( II ) Solution

Dissolve 1 g of acid wasbed and rinsed zincgranules or 1·245 I of zinc oxide (ZoO) in20 ml of 1 : I HNO.. Dilute to 1 litre withwater. 1 ml - 1·0 mg of zinc.

6.4.10 Intermediate Zinc Solution

Dilute 100 ml of zinc stock solution and 1 mlof nitric acid to 1 litre with water.

'.4.11 Sttmdord Zinc Solution

Dilute 10 ml of zinc intermediate solution and1 ml of nitric acid to 1 litre with water. Thissolution should be prepared just before use.

6.5 Procedure

6.5.1 For dissolved zinc, filter 100 ml of thesample through 0·45,um membrane filter paper.For total zinc, add S ml of concentrated nitricacid and evaporate the solution to IS to 20 ml.Cool and filter the sample through acid washed

IS 3025 ( Part 49 ) : 1994

filter paper. Make up to 100 ml in a volumetricflask. Add to this solution or the filtrate ( incase of dissolved zinc) 2 drops of bromophenolblue indicator solution and mix. Adjust thepH by adding sodium hydroxide solution till ablue colour persists. Add diluted hydrochloricacid ( 1 : 50 ) drop by drop until the colour justdisappears; then add 2·5 ml in excess to bringthe pH to 2·3-2·5. Add 10 ml of pyrrolinedithio carbamic acid - chloroform reagent andshake well. After the phases separate out. collectthe chloroform phase by taking care to avoidany trace of water in a flask. Repeat the extrac­tion till the chloroform layer becomes colourlesswith fresh 10 ml portions of chloroform andcombine the extracts. Evaporate the solutionjust to dryness and dissolve the residue bydropwise addition of 2 ml of concentratednitric acid by holding the beaker at an angle.Again evaporate to dryness and add 2 ml ofhydrochloric acid ( 1 : 2 ) and heat for 1 minute.Cool and make up the solution in a 10 mlstandard flask. Aspirate the sample andmeasure the absorbance.6.5.2 Prepare a reagent blank and sufficientstandards containing 10, 20, 50, 100 and 20011'8/1 of zinc by diluting a suitable volume of the

. standard solution with 100 ml of water andrepeat as above. Aspirate the solution andmeasure the absorbance.'.6 CalcalatioD'.'.1 Construct a standard calibration graph byplotting the absorbance versus the microgramsof zinc. Read the concentration of the samplesfrom the curve.

Zinc, "a/I ...-~ x 1 000

whereM =a mass of zinc present in the sample

( in ,,8), andV = volume of sample in mI.

7 DIFFERENTIAL PUlSE ANODICSTRIPPING VOLTAMMETRY (DPASV)

7.1 PrlDclpleZinc is deposited on a hanging mercury drop ata negative potential of- 1·2 V vs saturatedcalomel electrode (SeE). Then the zinc isstripped back into the solution by applying a+ ve potential scan. The anodic current peakwhich is measured is representative of the zincconcent ration in the sample. Por total dissolvedzinc the sample is filtered through a 0·45 I'mmem brane filter paper prior to acidificationand analysis, .

This method is applicable In the concentrationraDle 1-0-100 ",g/l of zinc.

7.2 laterfereneesSelenium interferes when it is present in exce••of SO P:g/1 .. This. can be overcome by addingascor.blc acid which reduces selenium ( IV ) toselenium metal. Iron (III) interfere. whenpr~sent at levels greater than zinc. Howeverthis can be overcome by warming the solutionwith hydroxylamine. Also, the presence or anyother neighbouring stripping peaks which is lessthan 100 mV from that of the zinc will interfere.

7.3 Apparatal7.3.1 Polarographic Instrumentation Ctlpable ofPerforming Differential Pulse Work

7.3.2 Hanging Mercury Drop Electrode

7.3.3 Platinum Counter Electrode

7.3.4 Saturated Calomel Reference Electrode

7.3.5 Magnetic Stirrer Control Unit, Stirring Bar

7.4 ReageDts

7.4.1 Hydrochloric Acid - Concentrated.

7.4.2 Nitric Acid - Concentrated.

7.4.3 Nitric Acid - Diluted ( 1 : 1).

7.4.4 Zinc Solutions

7.4.4.1 Stock zinc solution - Prepare as in '.4.9.

7.4.4.% Intermediate zinc solution - Prepare asin 6.4.10_

7.4.4.3 Zinc standard solution - Prepare a.in 6.4.11.

7.4.5 Amalgamated Zinc

Cover 10 g of granular zinc with water and add2 drops of concentrated hydrochloric acid.Then add S-8 drops of mercury with continuousshaking.

7.4.6 Purified NitrogenBoil 2 • of ammonium meta vanadate with 2S mlof concentrated hydrochloric acid. Dilute to250 ml and transfer to the scrubber. Add 10-15 gof amalgamated zinc. Pass nitrogen pi throUlhthe scrubber for removal of traces of oxygenand through distilled water for washio8 aoytraces of scrubber chemicals ( Pig. 1 ).

7.5 Procedure7.5.1 Clean all the glassware. and the voltam­metric cells by soaking them overnight inconcentrated nitric acid and rinsins themthoroughly with distilled water. If total dissol­ved zinc alone is to be determined, the sampleshould be filtered through 0·45 ~m membranefilter paper. For total recoverable zinc, diaeat

4

the sampl~ with 3 ml each of concentratedhydrochloric acid and nitric acid. Evaporate thesolution to 15-20 mi. Cool and make up to100ml in a volumetric flask. Take 10 ml of thesample in the polarographic cell and deaeratefor 15 minutes. The cell should be covered withnitrogen gas during the experiment ( Fig. 2 ).

Generate a new droplet of mercury and put thestirrer on. Connect the cell and deposit at-1'2 V versus SCE for 3 minutes. Stop thestirrer and wait for 30 seconds. Start the anodic•can with the following settings:

Initial potential - }'2 V vs SCEScan rate S mV/sScan direction +veModulation amplitude 2S mVCurrent range 1-10 p.ADrop time 0'5 sDisplay direction - veLow pass filter Off positionMode Differential pulseScan range -1·2 to -0·6 V

IS 3025( Part 49) : 19H

Measure the current peak height ( /1)' Add20 "I ofstandard zinc solution and deaerate forS minutes. Repeat as above. Measure thecurrent peak height ( 1. ).

7.' CaleulatioDII V CSld X 1 000

Ceampl•• mgll = 1. v + (1.-11) V

where11 = current peak height for the

sample •I • .. current peak height for the

sample + standard.

l' _ volume of standard added( 20 141 ).

V _ volume of the sample solution.

CIld == concentration of the standardsolution added. and

CBtomple .. concentration of zinc in thesample.

-WATER

==~ r;:::=== --;;

AMALGAMATEDZINC

FIG. 1 ScRUBBIIR AssEMBLY 'OR NITROGBN PuRIPlCATION

s

IS 3025 ( Part ..9 ) : UN

..

STIRRER BAR

TO HI RESERVOIR

Flo. 2 VOLTAMIO!'I'RIC CELL ASS8MBLY

6

PI COUNTERELECTRODE

HhtDE,WORKINGELECTRODE

Claalrman

ho, D. K. BmwAI

IS 3025 ( Part 49 ) : 1994

ANNEX A(Foreword)

COMMITTEE COMPOSITION

Environmental Protection Sectional Committee, CHD 012Repre,entln,

Central Pollution Control Board, Delhi

M.mbe"DR K. R. RANOANATHAN ( Alternat« to

Prof D. K. Biswaa )ADVISER ( PHE )

ADDL ADVISER ( PHE ) ( Allernat, )SHRIS.B.C.AoARWALA

SRRI S. BALAOURUNATHAN ( Alternat« I )SRRI A. I{. GUPTA ( Allernate 11 )

Da A. L. AOOARWAL

Da T. CHAXRABARTI ( Alternate)DaA. ALA"

SHRI S. C. AHLUWALIASHRI A. D. AONIHOTllJ ( Alternat« )

SRaI R.. IC. BANERJEBSHRI P. K. MAIR ( Alternate )

SHRI B. BASUDR S. MUKHERJEE ( Alternate )

SRRIV.S.BHATNAOARDR M. S. N· SRINIVAS (Alternate)

Rnl S. CHAItRAVORTI

DR M. H. FULEKAR ( Alternate )Saar S. DAS

SRIt.M. K. PRABHUDBSAI ( Alternate )DR V. S. GUPTA

SHRI D. N. P. SINOH ( Alternate)DR HARISH CHANDRA

SHRI B. K. JAINDR ( Ms ) B. SWAMINATHAN ( Altemat« )

SBRI G. K. GURIJADR A. K. WAOU ( Alt.rnat, )

So, A. LAHIR!SHRI B. B. DAV. ( A.lterut' )

DRW. MADHAVAItRIIHNASRRI S. 'RAlAMANI (Alternal.)

SSRI S. J{. MAIKASHRI A. SARA (A Iterllat, )

SRal R.. IC. MALHOTRASRRI S. K. JAIN (Alt,rna,.)

SHRI A. N. KALB5n. V. S. MAHAlAH ( ""t~rnatl )

D. p. K. MATHUR

n..P. M. MODAKPRo, H. VI.RAMAN. ( Allernat,)

SHIll K. p. NYATISRRI L. PANEBRSELVAM ( Alt~rlltlt' )

P.o. B. PADMANABHAMURTHY

DR T. S. PATELSOl C. V. RAIYANI (AII.fllll'.)

DR V.V. RAODa M. ATCHAYYA (Alternate)

Ministry of Rural Development

Dharat Heavy Electrical. Ltd. Hyderabad

National Environmental EOlineeriol Research Institute ( CSIR),HalPur

Indian Council of Aaricultural Research, New DelhiNational Council for Cement" Duildin. Materials, New Delhi

Shriram Institute for Industrial Research, Delhi

National Thermal Power Corporation Ltd, New Dolbi

Central Scientific Inetruments Orlanizatjon ( CSIR), Chandigarh

Directorate General Factory Advice Service & Labour Tn.litutes,Bombay

Indian Petrochemical. Corporation Ltd. Vadodara

National Telt Houle, Calcutta

Industrfal ToxicololY Research Centre ( CSIR ). LucknowThe Fertilizer Association of India. New Delhi

Thermax Ltd. Pune

Hindustan Lever Ltd, Bombay

Central Leather Research Institute ( CSIR), Madras

Flakt Jodia Ltd, Calcutta

Indian Oil Corporation Ltd ( R.& D Centre ), Faridabad

Municipal Corporation of Greater Bombay

Bhabha Atomic Reteareh Centre (IOCAR), ICalpakkam (TN)Indian Institute of TechnololY, Bombay

National Productivity Council, New Delhi

Jawabarlal Nehru Univeraity. New DelhiNationallnltitute of Occupational Health (leMR), Ahmadabad

Dbarmai Morarji Chemical Co Ltd, Bombay

( Conlllllled011JHI~ 8 )

7

IS 3025 ( Part 49 ) : ItN

( COIII'IIM.d fromP"I. 7 )Member.

SHRIP.S. RAMANATHANSIIRID. N. V. RAo

SRaI R. J. BUCR (..4lt~r1lllt.)DR S. RoUTH

DR J. C. NIJHAWAN ( A/terllat. )SRRI P. R. SAMADDAR

SRRI P. K. SBN ( Alternale )SRRI S. C. SHARMA

SRRI R. N. GUPTA ( Alternale)SRRI M. P. SINOH

SHRI N. C. TIWARI ( A/terMte )SHRI M. SUBBA RAO

DR T. CHANDINI ( Alternat. )SHRI R. M. SUNDARAM

SHRI C. KRISHNA RAO ( Alternate)SRRI SURBNDIR KUMAR

SRRI R.. PARTHASARTHY (AII.rnate)Su.aINTINDING BNGINESR

J EXECUTIVE ENOINna ( Alternale )SRRI J. M. TULI

SRRI S. N. CHAKRABART. (AlterMle )DR R. K. SINOH,

Director ( Cbem )

R.,re.entlllgPesticides ASlociatfon or India, New DeIhlTata Chemicall Ltd, Bombay

National Teet Houle, Calcutta

Contral Mechanical BOil Rosearch Institute ( eSIa.), Dur._pur

India Metcorololical Department, New Delhi

Directorate General or Technical Development, New Delbi

Ministry of Bnvironment & Porcltl

National Malaria Bradication Programme (DOHS ), Dolhi

Indian Chemical Manufacturers Association, New Delhi

Panchayat Raj Department, Government 01 Andbra Prado.h,Hyderabad

Enlineera India Ltd, New Delhi

Director General. DIS ( Ex-officio M.",b.,)

M,mber S,~,eIQry

SRRI T. RANOAIAMYJoint Director ( Chem ). DIS

Water Environment Subcommittee, CHD 012 : 01Co",.".,

DR Y. P. KAItAR

MemHr,SHRI S.B.C. AOARWALA

SBRI A. K. GUPTA ( Allel'Mt. )8HRI A. BAsu

SRRI A. IC. JINDAL ( A.II.rIUlI. )SHRI M. S. DHINORA

SRRI V. G. K. NAIR ( Alt,rIlGI, )DR E. IC. JAYANARAYANAN

SRRI K. K. Manu ( AII,rllat. )SRRI S. ISLAMSRRI F. LAL IC.ANIAL

Sn. S. S. SANOHA ( Alt,r1lll1, )SRRI D. D. KUMTA

DR K. C. PATHAIt ( Alternale )PRo. IC. J. NATH

PRO. A. K. ADHYA ( Alt,rtlat, )DR R.. NATH

DR S. RATAN ( Alt,rllllt. )DR S. ll. PAND8

DR M. V. NANOTI (A/t,rnat,)DR p. M. PHIRKa

DR S. R.. JOSHI (~II""Qt')SRRI S. PRAKASH

SHRI S. S. lluIRAICHYANI ( 1f11.rllG/, )5RRI R. V. RAO

SSRI D. K. KAUIHIIt ( Ifll.rIltJI, )RIPRBI8NTATIVIR.BPRBlBNTATIVIDR B. SINOU.TA

DR Il. C. TaivlDI ( Alt.rlUlt. )SUPBRINTINDINO BHOINI.R

EXICUTIVI BNOINII& ( ~/te'IIG'. )SHIll S. ll. TAUTA

Snl K. RAJAOOPALAN ( Alt.,,,,,'. )Da p. N. VIIWANATRAM

Mini'try of Environment &. Forestl

Bharat Heavy Electricall Ltd. Hyderabad

Thermax Ltd, Puoe

Shriram Institute for Industrial Research, Deihl

Mohan Meakin Ltd, Mohan Na.ar

Central Pulp and Paper Research Institute. SabaraDpurPunjab Pollution Conrrol Board, Patiala

Tata Chemicall Ltd, Bombay

All India Institute of HYliene &. Public Heal tb, Calcutta

Banaral Hindu University, Varanasi

National Bnvironment BOlineerinl R.esearch In.tltuto (ClIR. ).Na,Pur

National Environment Ba.ioeerinl R.e.eareb Inltituto (CSIR),Na.pur

Delhi Water Supply & Sewa,o Disposal Undcrtakilll, No. DeW

Central Water Commilsion, Now Delhi

Ministry of Rural DevelopmentU. p. Jal Nilam, LuckoowCentral Pollution Control Board, Del hi

Panchayat Raj Department, Government of Aodhra Pradllb,Hyder.bad

Central Ground Water Board, New Delhi

Indultrial ToxicololY R.olearch Centro ( CSIR. ), LuokDow

8

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This Indian Standard has been developed from Doc: No. CHDOI2( 172)

Amendments Issued Since Publication

Amend No. Date of Issue

BlJREAU OF INDIAN STANDARI)S

Text Affected

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