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है”ह”ह

IS 3025-46 (1994): Methods of Sampling and Test (Physicaland Chemical) for Water and Wastewater, Part 46: Magnesium[CHD 32: Environmental Protection and Waste Management]

IS 3025 (Part 46) : 1994(Reaffirmed 2003)

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Indian StandardMETHODS OF SAMPLING AND TEST

(PHYSICAL AND CHEMICAL) FOR WATERAND WASTEWATER

PART 46 MAGNESIUM

( First Revision)

Fifth Reprint MAY 2008(Including Amendment No. 1 & 2)

UOC 628.1.032 : 628.3 : 543.3 [ 546.46 ]

C BIS 1994

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

February 1994 Price Group 4

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.

Magnesium ranks eighth among the elements in order of abundance and is a common constituentof natural water. Magnesium salts are important contributors to the hardness of water whichbreak down when heated. forming scale in boilers. The magnesium concentration may varyfrom zero to several hundred milligrams. Chemical softening, reverse osmosis, electrodialysis,or ion exchange reduces the magnesium and associated hardness to acceptable levels.

The technical committee responsible for formulation of IS 3025 and IS 24118 and its parts, decidedto revise all the parts covered under them and publish it in separate parts.

This standard supersedes 34 of IS 3025 : 1964 and 6 of IS 2488 (Part 5) : 1976. In the preparationof this standard, considerable assistance has been derived from <Standard methods for the examin­ation of water and wastewater' published by the American Public Health Association. Washington,USA, 17th Edition, 1989.

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

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'R ules for rounding off numerical values ( revised)'.

AMENDMENT NO. 1 SEPTEMBER 2000TO

IS 3025 ( PART 46 ) : t 994 METHODS OF SAMPLINGAND TEST ( PHYSICAL AND CHKMICAL) FOR WATER

AND WASTEWATERPART 46 MAGNESIUM

( First Revis..ion )

(Page 3, clause 6.4.8, line 3 ) - Insert the following JIlIIUer after the words"complexing agent' :

'Iike.Magnesium Slilt of 1, 2- cyclohexane diamine tetra acetic acrd (MgCDTA)'

(ClIO 12)

1 II} [)'~ptL of UIS/20QR

AMENHMENT NO. 2 MAH.CU 20('~

TOIS 3025( PART 46) ; J994 METHODS OF SAMPUN(~

AND TEST (PHYSICAl. AND CHEMICA L) 'FOIl \'':ATEI~

AND \\1ASTEWATER

PART 46 MAGNESIUM

(' First Revision )

(Page L, ilaus«: 5.5.1, lin, :?"' Slll>stilute '.10 tC»)(J m! /-,j -IU 1<J -'0 In'

( Page 4, dWH<'7.4.4, line :2) ,-- Suhvuture . MgU' lin '/l.lr,)·

(CHD 32 l

110 Deptt. of HlS.-':!Pllll

IS 3025 ( Part 46 ) : 1994

Indian Standard

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

AND WASTEWATERPART 46 MAGNESIUM

( First Revision)1 SCOPEThis standard prescribes three methods for thedetermination of magnesium:

a) Gravimetric method as magnesiumpyrophosphate;

b) Volumetric method using EDTA; andc) Atomic absorption spectrophotometric

method.2 REFERENCESThe Indian Standards listed below are thenecessary adjuncts to this standard:

IS No. Title

264 : 1964 Nitric acid (second revision)3025 t Part I ): Methods of sampling and test

1986 ( physical and chemical) forwater and wastewater: Part ISampling (first revision)

7022 ( Part I ): Glossary of terms relating to1973 water, sewage and industrial

effluents. Part I

7022 ( Part 2 ): Glossary of terms relating to1979 water, sewage and industrial

effluents, Part 23 TERMINOLOGYFor the purpose of this standard. definitionsgiven in IS 7022 (Part 1 ) : 1973 and IS 7022( Part 2 ) : 1979 shall apply.4 SAMPLING AND STORAGEThe sampling and storage shall he done asprescribed in IS 3025 ( Part I ) : 1986.5 GRAVIMETRIC METHOD AS MAGNESIUMPYROPHOSPHATE5.1 PrincipleDiammonium hydrogen phosphate quantita­tive!y precipitates magnesium in ammonicalsolution as magnesium ammonium phosphate.The precipitate is ignited and weighed asmagnesium pyrophosphate. Below 1 mg/ l,atom ic absorption spectrophotometric methodis desirable.

110Deptt. of BIS/2008

5.2 InterferenceThe solution should be reasonably free fromaluminium, calcium. iron, manganese silicastrontium and suspended matter. It shouldnot contain more than about 3·5 g ammoniumchloride.5.3 Apparatus

5.3.1 Vacuum Pump or Other Source of Vacuum5.3.2 Filter Flasks

5.3.3 Filter Crucibles - medium porosity; 30 011.

5.4 Reagents

5.4.1 Methyl Red Indicator Solution

Dissolve 100 mg of methyl red sodium salt indistilled water and dilute to 100 ml,

5.4.2 Hydrochloric Acid - 1 : I, 1 : 9 andI: 99.

S.4.3 Ammonium Oxalate Solution

Dissolve JO g ( NH4 )8 C20. + H.O In 250011distilled water. Filter, if necessary.

5.4.4 Ammonium Hydroxide - Concentrated ­I: 19.

5.4.5 Nitric Acid - Concentrated (see IS 264 :1964 ).

5.4.6 Diammonlum Hydrogen Phosphate SolutionDissolve 30 g of diammonium hydrogen phos­phate (NH.)8 HPO. in distilled water andmake up to 100 ml.

5.4.7 Urea5.5 Procedure5.5.1 Pre-treatment of Polluted Water and Waste­Ml/Jter SamplesMix the sample pretreated if so required andtransfer a suitable volume (50 to 100 011) to250 ml conical flask or a beaker. Add 5 mlconcentrated nitric acid and a few boiling chipsor glass beads. Bring to a slow boil and

IS 3025 ( Part 4() ) : 1994

evaporate on a hot plate to the lowest volumepossible (about 10 to 20 m ) before precipita­tion or salting occurs. Add 5 ml concentratednitric acid cover with a watch glass and heat toobtain a gentle refluxing action. Continue hea­ting and adding concentrated nitric acid asnecessary until digestion is complete as shownby a light-coloured clear solution. Do not letsample dry during digestion. Add I to 2 mlconcentrated nitric acid and warm slightly \0

dissolve any remaining residue. Wash downbeaker walls and watch glass with water andthen filter, if necessary. Transfer filtrate to100 ml volumetric flask, with two S-ml portionsof water adding these rinsings to the volumetricflask. Cool, dilute to mark and mix thoroughly.Take portions of this solution for the deter­mination.

5.5.2 Removal of Calcium and Other Metals asOxalates

To 200 ml of the sample pretreated if so requi­red containing about 50 mg of calcium, add afew drops of methyl red indicator and I: Ihydrochloric acid. Sufficient acid must bepresent in the solution to prevent the precipi­tation of calcium oxalate when ammoniumoxalate solution is added. Introduce SO ml ofammonium oxalate solution and ISg of urea.Boil the solution gently until the methyl redchanges its colour to yellow. Filter the preci­pitate and wash with small volume of coldwater until free from chloride.

S.5.3 Determination of Magnesium

To the combined filtrate and washings from5.5.2 containing not more than 60mg magnesiumadd 50 ml of concentrated nitric acid and eva­porate carefully to dryness on a hot plate. Donot let reaction become too violent during thelater part of the evaporation stay in constantattendance to avoid losses through spattering.Moisten residue with 2 to 3 ml of concentratedhydrochloric acid, add 20 ml of distilled water,warm, filter and wash. To the filtrate add 3 011of concentrated hydrochloric acid 2 to 3drops of methyl red solution, and 10 ml of( NH, ).HPO, solution. Cool and add concent­rated ammonium hydroxide drop by drop, stirringconstantly until the colour changes to yellow, stirfor 5 minutes add again S ml of concentratedammonium hydroxide and stir vigorously for10 minutes more. Let it stand overnight andfilter through filter paper. Wash with 1: 19ammonium hydroxide. Transfer to an ignited,cooled and weighed crucible. Dry precipitatethoroughly and burn paper off slowly, allowingcirculation of air. Heat at about SOO°C untilresidue is white. Ignite for 30 minutes at1 100°C to constant mass.

2

5.5.4 Calculation

M · I' Magnesrum, mg/ltre = V x 21S·4x 101

where

M = mass in mg of magnesium pyrophos­phate, and

V = volume in rnl of sample.

5.6 Precision and Accuracy

The method is precise to ± 0·5 mg or better,and the accuracy is comparable if interferencesarc absent.

6 VOLUMETRIC METHOD USING EDTA

6.1 Principle

When water sample containing both calciuman.d mag~esium is titrated with EDTA at pH 10,USing Eriochrorne black-T as indicator, whichestimates values of calcium and magnesium. Ina separate titration against EDTA at pH 12 to13 range using murexide or Patton and Reeder'sindicator, calcium is selectively estimated.From I hese two values magnesium contentmay be calculated. Below I mgll concentra­tion it is desirable to use atomic absorptionspectrophotometric method.

6.2 Interference

Some metal ions form complexes with EDTAand interfere in the process of determinationof calcium and magnesium by EDTA methodby causing fading or indistinct end points. Thisinterference is reduced bv addition of certaininhibitors to the water samples prior to titrationwith EDTA.

6.3 Apparatus -- Hot plate.

6.4 Reagents

6.4.1 Indicator Solutions

6.4.1.1 Patton and Reeder and indicator solution

This indicator solution permits the directtitration of calcium in the presence of magne­sium. It produces a sharp colour change fromwine red to pure blue at the end point. It isprepared by mixing 1 g of Patton and Reederreagent with 100 g of sodium chloride/potas­sium chloride.

6.4.1.1 Murexide (ammonium purpurate)indicator solution

This indicator changes from pink to purple atthe end point. An indicator solution can beprepared by dissolving ISO mg of the dye in100 g of absolute ethylene glycol. Water solu­tions of the dye are not stable Cor longer than

a day. A ground mixture of the dye powderand sodium chloride provides a stable formof the indicator. It is prepared by mixing200 mg of murexide with 100 g of solid sodiumchloride and grinding the mixture to 355 to 300microns. The tiration should be performedimmediatelv after the addition of the indicatorbecause it' is unstable under alkaline condi­tions. End point recognition is facilitated bythe preparation of colour comparison blankcontaining 2·0 ml of sodium hydroxide solution,0'2 g of solid indicator mixture ( or I to 2 dropsif a solution is used) and sufficient standardEDTA titrant ( 0·05 to 0·10 rnl) to produce anunchanging colour.

6.4.1.3 Eriochrome black T indicator (EBT Indi­cator)

Dissolve 0'5 g of EBT indicator and approxi­mately 4·5 g of hydroxylamine hydrochloride in100 ml of rectified spirit (ethanol or methanol).

6.4.2 Standard Zinc Solution -- 0'01 M.

Dissolve 0'653 8 g of pure zinc dust or granulesof 99·9 percent purity in 20 ml of approximatelyI : I hydrochloric acid, warm if necessary. Cooland make up to I litre exactly in a volumetricflask. Preserve this solution in a tightly closedglass bottle.

6.4.3 Buffer Solution

a) Dissolve 70 g of ammonium chloride and570 ml of 30 percent ammonia solution(relative density 0·88 to 0,90) in waterand make up to I litre.

b) Sodium hydroxide I N '-' Dissolve 40 g ofsodium hydroxide and dilute to 1 litrewith distilled wate i ,

6.4.4 Standard Ethylene Diamine Tetra AceticAcid ( EDTA ) Solution - 0·001M.

Dissolve 3·75 g of disodium ethylene diaminetetra-acetate dihydrate in water and make up toI litre in a volumetric flask. Standardize thiswith standard zinc solution. Pipette out 25 mlof standard zinc solution in a 250 ml conicalflask. Adjust the pH to approximately 10 withbuffer solution. Dilute to about 100 ml andadd 3 to 4 drops of EBT indicator solution.This will give a red colour. Titrate with 0'01 Mof EDTA solution to a clear blue end pointfree from violet tinge. This solution will beslightly stronger than 0·01 M. Dilute the solu­tion to exactly 0·0 I M by adding calculatedamount of water and recheck the strength bytitrating 25 ml of standard zinc solution by exactlythe same manner as given above. This shouldconsume exactly 25'0 ml of standard EDTAsolution.

3

IS 30Z~ ( ~art 46 ) : 1994

6.4.5 Triethanolamine Solution - 10 percent( tn]» ).

6.4.6 Potassium Cyanide Solution - 10 percent( mjv ).

NOTE - Preserve in a polyethylene bottle.

6.4.7 Hydroxylamine Hydrochloride Solution­10 percent ( m/v ).

6.4.8 Inhibitor and Complexing Agents - Form-ist waters there is 110 need to utilize an in­hibitor or cornplexing agent. Occasionally watercontaining interfering ions other than Ca++and Mg++ requires adding an appropriate in­hibitor or cornplexing agents to give a clear,sharp change in colour to the cnd point, Avoidthe use of sodium cyanide inhibitor,

6.5 Pre-treatment of Polluted Water and Waste­water Samples

As prescribed in 5.5.1-

6.6 Determination of Calcium

6.6.1 Sample Preparation

Because of the high pH used in this procedure,the titration should be performed immediatelyafter the addition of the alkali and indicator.Use 50 ml of sample or a smaller portion dilu­ted to 50 ml so that the calcium content is about5 to 10 mg. Analyse hard waters with alkali­nity higher than 300 mgfl CaCOs by taking asmaller aliquot and diluting to 50 ml, or byneutralization of the alkalinity with acid, boil­ing for one minute and cooling before beginningthe titration.

6.6.2 Add 2'0 ml of sodium hydroxide solutionOf a volume sufficient to produce a pH of 12to 13. Stir. Add 0'1 to 0'2 g of the indicatormurexide-sodium chloride mixture selected (orI to 2 drops if a solution is used). Alterna­tively, approximately I g of the mixture ofPatton and Reeder reagent and sodium chlorideor potassium chloride may be used. Add EDTAtitrant slowly with continuous stirring to theproper end point. Check the end point by add­ing I to 2 drops of titrant in excess to makecertain that no further colour change occurs.Let the volume used be VI'

6.6.3 Determination of Magnesium

Take a suitable aliquot of the solution, expectedto contain approximately 10 to 3C mg of calciumand magnesium in a 500 ml conical flask. Addro ml of hydroxylamine hydrochloride solution,2 ml of potassium cyanide solution and 25 mlof triethanolamine solution. Dilute to 150to 200 ml and add sufficient quantity of buffersolution to bring the pH to 10'0 ± 0·1. Add3 to 4 drops of EBT indicator solution and

IS 3025 ( Part 46 ) : 19'4

7.5.2 Preparation of Blank Solution

Prepare a blank test simultaneously using thesame reagents in the same quantities andfollowing the same procedure, but replacing thevolume of the test sample used in 7.5.1 by equalvolume of water.

7.5.3 Preparation of Set of Calibration StandardSolutions

To a series of 100 ml volumetric flasks with theaid of pipettes add O. 2'5. S, 10. IS, 20 and25 ml of the magnesium standard solution( 7.4.4). add either 10 ml of the lanthanumchloride solution or 10 ml of the cesium chlo­ride solution as in 7.5.1 and make up to themark with 0·1 N hydrochloric acid.7.5.4 Preparation of Calibration Curve

Aspirate the blank and calibration solutionswith aspirating distilled water in between. Notedown the absorbance value. Prepare calibrationcurve by plotting the absorbance readingsagainst concentration of magnesium standardsolution ( 7.5.3 ).

To a I litre volumetric flask add 24 g of lantha­num oxide ( La.Oa ) atomic absorption spectro­metry grade ). Slowly and cautiously add 50 mlof concentrated hydrochloric acid while stir­ring to dissolve the lanthanum oxide. Makeup to the mark with water.

7.4.3 Cesium Chloride - 20 g/l of Cs.

Dissolve 25 g of cesium chloride in 1 litre ofO' I N hydrochloric acid.

7.4.4 Standard Magnesium Solution-l 000 rngll

Dry a portion of magnesium oxide ( MnO ) at180°C fer I hour. Weigh 1'66 ± 0·01 g anddissolve in 1 N hydrochloric acid. Dilute withthe same acid to I 000 ml in a volumetricflask. Store the solution in a polyethylenebottle.

7.5 Procedure

7.5.1 Preparation of Test Solution

Sample: containing particulate matter afteracidification shall be filtered to prevent clog­ging of the nebulizer and burner systems. Toa 100 ml volumetric flask, add 10 ml of lantha­num chloride solution ( 7.4.2) if an air-acety­lene flame is to be used, or 10 ml of cesiumchloride solution (7.4.3) if a nitrous oxide­acetylene flame is to be used. Add 10 ml oft he sample and make up to the mark with 0·1 Nhydrochloric acid.

NOTE -If the concentrario n or the sample is hi,her.then appropriately smaller volume of the sampleshall be used.

I 000 x ( V, - Vt )

V

NOTE - If magneaium i. net present. it should beadded as 1 : 1 magnesium EDTA complex. in orderto get the proper colour change at the end point.This can be done by either adding I ml of 0·1 magne­sium EDTA ( 1 : 1 ) complex before proceeding fortitration, or. incorporating sm:111 amoun t of Mg. +ions in EDTA solution before its standardization.

7 ATOMIC ABSORPTION SPECTROPHOTO­METRIC METHOD

7.1 This method is applicable to the analysis ofraw and drinking waters ann can' be used forwaters having a magnesium content up to 5 mgper litre. For samples containing higher concen­tration smaJler volume of the sample must betaken for the analysis. In general nitrous oxide­acetylene flame should be used if the compo­sition of the sample is complex or unknown.

7.2 IDterfereaClI

Chemical interferences are common. Thesecan be overcome by the addition of a releasingagent. that is. lanthanum chloride [ if air-acety­lene (oxidizing) flame is used] or cesiumchloride (if nitrous oxide-acetylene flame isused ).

7.3 Atomic absorption spectrophotometer setup and equipped with an appropriate burner forair-acetylene flame or nitrous oxide-acetyleneflame and a hollow cathode lamp for magnesiumwith wavelength of 285'2 nm,

7.4 Reagents

7.4.1 Hydrochloric Acid - 1 Nand 0'1 N.

7.4.2 Lanthanum Chloride - 20 gIl of La.

whereV == volume in ml of the sample taken for

the test;

Vt - volume in ml of BDAT consumed intitration for calcium determination inthe same aliquot of solution of sample;and

Va - volume in ml of EDTA solution con­sumed in titration.

6.6.4 Calculation

Magnesium ( as Mg ).mg/l percent 0'024 35 x

by mass :=-----...,--..>--....:....--':....:.

titrate with 0'01 M EDTA solution till the redcolour changes to pure blue end point freefrom violet tinge. It is easier to note the endpoint by comparing the colour with that ofpreviously titrated solution having a pure blueend point, where a slight excess of EDTAsolution has been added.

4

7.5.5 Aspirate the test solution (7.5•• ) andnote the absorbance value and read the concen­tration of magnesium from the calibration curve

. against the absorbance value obtained.

7.6 CalcalatloD

Magnesium V( as mg ), mgll = CX V:

where

C = concentration in mgll of magnesiumcalculated from the calibration curvehaving taken into account the blankvalue,

Vo - volume in mJ of the original sampletaken for analysis, and

IS 3015 ( Part," ) : .994

Vl = volume in ml to which the sample hasbeen diluted.

8 PRECISION

In a single laboratory using distiUed water withadded calcium concentrations of9'0 and 36 mgflthe standard deviations were 0'3 and 0'6 mgllrespectively. Recoveries at both these levelswere 99 percent.

In an interlaboratory study with over 50 parti­cipating laboratories, Qs four waters withcalcium contents in the range 100 to 300 mglland magnesium contents from 7 to 85 mgll wereanalysed. The coefficients of variation variedfrom 3'5 to 4·6 percent for calcium and from2·9 to 6·9 magnesium.

5

IS 3025 ( Part 4' ) : 1994

Chairman

.PROP D. K. BISWAS

ANNEX A(Foreword)

COMMITTEE COMPOSITION

Environmental Protection Sectional Committee, CHD 012Representing

Central Pollution Control Board, Delhi

MembersDR K. R. RANOANATHAN ( Alternate to

Prof D. K. Biswas )ADVISER ( PHE )

AooL ADVIS.R ( PHE ) ( Alternate)SHRIS. B.C.AGARWALA

SHRI S. BALAOURUNATHAN ( Alternat« I )SHRI A. K. GUPTA ( Alternate II )

DR A. L. AOGARWAL

DR T. CHAKRABARTJ ( Alternate)DR A. ALAMSHRI S. C. AHLUWALIA

SHRI A. D. AONIHOTRI ( Alternate )

SHRI R. K. BANERJEESHRI P. K. MAIR ( Alternate)

SHRI B. BASUDR S. MUKHERJEE ( Alternate)

SHRI V. S. BHATNAGARDR M. S. N· SRINIVAS ( Alternate)

lllHRI S. CHAKRAVORTI

DR M. H. FULEICAR ( Alternat« )SHU S. DAS

SHRI M. K. PRABUUDESAI ( Alternate)DR V· S. GUPTA

SHRI D. N. p. S'NGH ( Alternate )DR HARISH CHANDRASURI B. K. JAIN

DR ( Ms ) B. SWAMINATHAN ( Alternate )SOl G. K. GURIlJA

DR A. K. WAOLB ( Alternate)So, A. LAHIRI

SHRI B. B. DAVE ( Alternat« )

DR W. MADHAVAltRISHNASHRI S. RAJAMANI (Alternate)

SHR' S. K. MAJRASHRt A. SARA (Altllrnate )

SHill R. K. MALHonASHRI S. K. JAIN ( Alternate)

SRllI A. N. KAuSor V. S. MAHAlAN (Alternat.)

DIl p. K. MATHURDIl p. M· MODAlt

PRoPH. V8lIRAWAN' ( Alternat.)SHal K. P. NYATI

SOl L. PANIlBRSELVAM ( Alternat. )Paop B. PADMANABHAMVRTHYDa T. S. PATllL

Smll C. V. RAIYANI (Alt.,nat.)Dil V.V. RAO

DIl M. ATCHAYYA ( Alt.rnat. )

Ministry of Rural Development

Bharat Heavy Electricals Ltd. Hyderabad

National Environmental Enaineerina Research Institute (CSIR).Nagpur

Indian Council of Agricultural Research, New DelhiNational Council for Cement & Building Materials , New Deihl

Shriram Institute for Industrial Research, Delhi

National Thermal Power Corporation Ltd, New Delhi

Central Scientific Instruments Organization ( CSIR). Chandigarb

Directorate General Factory Advice Service & Labour Institutes,Bombay

Indian Petrochemicals Corporation Ltd, Vadodar a

National Test House, Calcutta

Industrial Toxicology Research Centre ( CSIR ), LucknowThe Fertilizer Association of India. New Delhi

Thermax Ltd. Pune

Hindustan Lever Ltd, Bombay

Central Leather Research Institute ( CSIR ). Madras

Flakt India Ltd, Calcutta

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

Municipal Corporation or Greater Bombay

Bhabha Atomic Research Centre ( IGCAR), Kalpakkam (TN)Indian Institute of Technology, Bombay

National Productivity Council. New Delhi

Jawabarlal Nehru Univerlit:ll. New DelhiNational Institute of Occupational Health ( ICMR), Ahmadabad

Dharmsi Morarji Chemical Co Ltd, Bombay

( Continued on pap 7 )

6

( Continll!d from page 6 )

Membe"SHIll P. S. RAMANATHANSHRI D. N. V. RAO

SHil.l R. J. DUCH ( Alternate)DR S. ROUTH

DR J. C. NUHAWAN ( Alternate)SHRIP. R. SAMADDAR

~HRI P. K. SEN ( Alternate)SHRI S. C. SHARMA

SHil.l R. N. GUPTA ( Alternate)SHRI M. P. SINGH

SHil.l N. C. TIWARI ( Alternate)SHil.l M. SUBDA RAO

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

SHil.l C. KRISHNA RAO ( Alternate )SHil.l SURENDER KUMAR

SHil.l R. PARTHASAaTHY (Alternate)SUPI!RINTI!ND/NO ENOINEER

EXECUTIVE ENO/NEER ( Alternate)SHil.l J. M. TULI

SHRI S. N. CHAKRABARTI ( Alternate )DR R. K. SINOH,

Director ( Chern )

IS 302S ( Part 46) : 1994

RepresentingPesticides Association of India, New DelhiTata Chemicals Ltd. Bombay

Nat ional Test House, Calcu tta

Central M.:chanical Engg Research Institute ( CSIR ). Durgapur

India Meteorological Department, New Delhi

Directorate General of Technical Development, New Delhi

Ministry of Environment & Forests

National Malaria Eradication Programme (DGHS ), Delhi

Indian Chemical Manufacturers Association, New Delhi

Panchayat Raj Department, Government of Andhra Pradesh,Hydcrabad

Er.ginecrs India Ltd, New Delhi

Director General, BIS ( Ex-officio Member)

Member Serre·tarySHRI T. R"NOASAMY

Joint uirector ( Chem ), BIS

Water Environment Subcommittee, CHD 012: 01Convener

DR Y. P. KAKAR

Members

SHil.l S. R. C. AOARWALASHa I A. K. GUPTA ( Alternate)

liHal A. BASUSHal A. K. JINDAL ( Alternate)

SURI M. S. DR/NORASHill V. G. K. NAIR (Alternate)

DR E. K. JAYANARAYANANSHRI K. K.. M ITTU ( Alternate)

;;HR I S. ISLd'SHRI F. LAL KANSAL

SHil.l S. S. SANGHA ( Alternate)SHRI D. D. KIJMTA

DR K. C. PATHAK (Alternate)PROP' K. J. NATH

PROP' A. K. ADHYA ( Alternate )DR R. NATH

Dk S. RATAN ( Alternate)DR S. R. PANOS

DR M. V. NANOTI (Alternate)DR p. M. PmRKB

DR S. R. JOSHI ( Alternate )581.' S. PRAKASH

SHil.l S. S. R"MRAK8YANI (Alternate)SHRI R. V. RAO

SHRI D· K. KAUSHIK ( Alternate)REPRBSENTAT/VBREPRESENTATIVEDR B. SBNGUPTA

DR R. C. TRIVEDI ( Alternate)SUPBIUNTI!NDINO ENOINl!IlR

EXECuTlVIi ENOINIIlR ( Alternate)SHRIS.R.TAMTA

SHil.l K. RAJAOOPALAN ( Alternate)DR p. N. VUWANATHAN

Ministry of Environment & Forests

Bharat Heavy Electricals Ltd, Hyderabad

Thermax Ltd. Pune

Shriram Institute for Industrial Research. Delhi

Mohan Meakin Ltd. Mohan Nagar

Central Pulp and Paper Research Institute, SaharanpurPunjab Pollution Control Board, Patiala

Tata Chemicals Ltd, Bombay

All India Institute of Hygiene & Public Health, Calcutta

Banaras Hindu University, Varanasi

National Environment Engineering Research Institute ( C5IR ).Nagpur

National Environment Engineering Research Institute (CSIR).Nagpur

Delhi Water Supply & Sewage Disposal Undertaking, New Delhi

Central Water Commission, Ne'W Delhi

Ministry of Rural DevelopmentU. P. Jal Nigam, LucknowCentral Pollution Control Board, Delhi

Panchayat Raj Department, Goverment of Andhra Pr_dub,Hyderabad

Central Ground Water Board. New Delhi

Industrial Toxieotoay Research Centre ( CSIR), Lucltnow

7

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Review or Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of'BIS Catalogue' and 'Standards: Monthly Additions'.

This Indian Standard has been developed from Doc: No. CHD 012 (0162).

Amendments Issued Since Publication

Amendment No. Date of Issue

BUREAU OF INDIAN STANDARDS

Text Affected

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Telephones

{2323761723233841

{2337 8499, 2337 856123378626,23379120

{26038432609285

{2254 1216,2254 14422254 2519, 2254 2315

{2832 9295, 2832 785828327891,28327892

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