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

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“Invent a New India Using Knowledge”

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“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”

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“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 10523 (1983): Baby toilet soap [CHD 25: Soaps and otherSurface Active Agents]

IS : 10523 • 1983( Reaffirmed 1991 )

Indian StandardSPECIFICATION FORBABY TOILET SOAP

( First Reprint JUNE '998 )

UDC 661.187.842.2

e Copyright 1983

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

IS : 10523 • 1983

Indian StandardSPECIFICATION FORBABY TOILET SOAP

Soaps and Other Surface Active Agents Sectional Committee, CDC 3SChairman R~pr~st!nting

DR B. P. GODRF.J Godre] Soaps Ltd, Bombay

Members

SHRI M. S. TH4KUR ( Alternate toDr B. P. Godrej )

SHRI B. P. BAt..IOA Tata Oil MiIJs Co Ltd, BombayDR N. L. MURTHY ( Alternate )

SHRIMATI KRISHNA BASRUR Consumer Guidance Society of India (Reid),Bombay

DR V. SADASIVAN ( Alternote )SHRr S. K. BAsu Directorate General of Supplies & Disposals

( Inspection Wing ). New DelhiSHRr P. G. BAWARI Indian Soap &. Toileteries Makers' Association,

BombaySHRI R. S. VAIDYANATHAN ( Alternate)

SHRI M.A. BHATT Swastik Household &. Industrial Products Ltd,Bombay

SHRI C. R. K. MURTHY ( Alternate)SHRI N. C. CHATTERJEE National Test House, CalcuttaSHRI P. K. CHAKRABORTY ( Alternat« )CHEMIST '" METALLURGIST-II, Railway Board, Ministry of Railways

RDSO, LUCKNOWASSISTANT RESEARCH OffICER/eM-) ( Alternat« )

Cnre, CHEMIST Central Board of Revenues ( Ministry of Finance ).New Delhi

DEPUTY CHIEF CHEMIST ( Alltrllale )SaRI S. P. GUPTA Kusum Products Ltd, Calcutta

SHRI A. C. CHAKRABARTY ( Alternat« )DRS. S. KALBAQ Hindustan lever Ltd, Bombay

SaRI V. U. MARBALLI ( Alternate)S8RI P. P. KHANNA Nand Kishore Khanna & Sons, Bombay

SHRr N. K. KHANNA ( Alternate )DR M. K. KUNDU Directorate of Vanaspati, Vegetable Oils " rats,

New DelhiDR R. A. KHAN ( Alterna/e )

5RRI V. LAKSHMIKANTHAN Khadi &. Villaae Industries Com~lssion.Bombay

( ConIinu~d 011 /HlI. 2 )

(0 COP1,'gh/1983BUREAU OF INDIAN STANDARDS

This publication is protected under the Indian Copyright Act (XIV or 19'7) andreproduction in whole or in part by any means except with written permission of thepublisher shall be deemed to be an infrioaement of copyrigbt under the said Act.

IS I 10523 • 1983

(Continu,d/rom /Jag. I )Mt!mb~rs

SHRI P. R. MALHAN

Representing

Development Commissioner, Small Scale Industries,New Delhi

SHRI P. SATYANARYAN ( Altemat« )DR V. N. NIGAM Ministry of Defence ( DOl)

SHRI P. K. MAJUMDAR ( Alternate )SHRI S. RAMASWAMY Directorate General of Technical Development,

New DethiSnRI S. N. AOGARWAL ( Alternate)

SHRI SANTOSH KUMAR Federation of Association of Small Scale Soaps &Detergents Manufacturers of India, New Delhi

SRRI R. C. DOSHI ( Alternate )SHRI P. K. SHANRHAO Karnataka Soaps & Detergents Ltd, Bangalore

SHRI B. M. NATARAJ ( Alternate)DR A. K. VASI5HTHA Oil Technologists' Association of India, Kanpur

PROP V. V. R. SUDRAHMANYAN ( Alternate)SHRI M. M. VVAS Gujarat Detergent Manufacturers Association,

AhmadabadSHRI S. K. MATHUR, Director General, IS; ( Ex-officio Member )

Ilead ( Chern )

Sec,etory

SARI P. S. ARORA

Deputy Director ( Chern ), lSI

Soaps Subcommittee, CDC 35 : 1Convener

DRS. S. KALBAO Hindustan Lever Ltd, Bombay

MelnbersSHRI V. U. MAR8ALLI ( Alternate to

Dr S. S. Kalbal)SHRt S. N. AOARWAL DGTD, New Delhi

SHRt N. S. KANDARI ( Alternate)SHill J. A. ASHTAPUTRB Miniltry of Defence ( DOl)

SHRI P. N. AOARWAL ( Alternate)SHRI M. A. BHATT The Swastik Household and Industrial Product Ltd,

BombaySHRl C. R. KRISHNAMVRTHY ( Alternate)

SHRI D. S. CHAUDHURY Directorate General of Supplie41 &. Disposals,New Delhi

Da B. P. GODREJ Oodrej Soaps Ltd. BombaySHRr M. S. THAKUR ( Alle,n(l/~ )

SMRI S. P. GUPTA. Kusum Products Ltd, RishraSHa, A. C. CHAKRABARTY ( Alter"ate )

Da S. N. IYER Johnson &-Johnson Ltd, BombaySHRIMATI USRA R. JOSHI ( AlteTl,ale )

S8RI P. P. KHANNA Nand Kishore Khanna &, Sons, BombaySHRI N. N. KUANNA ( Alt,rnal, )

( Contlnwd on ptll~ 12)

2

IS : 10523 - 1983

( Continued/rom page 2)

Tata Oil Mills Co Ltd, Bombay

Karnataka Soaps & Detergents Ltd, Bangalore

Office of the Development Commissioner (SSI),New Delhi

Consumer Guidance Society of India, BombayFederation of Associations of Small Scale Soap &

Detergent Manufacturers of India, New Delhi

DR V. SADASIVANSIIRI SANTOSH KUMAR

Members Representing

SHRI K. S. KR1SHNAN Oil Technologists Association of India, KanpurDR M. M. AHUJA ( Alternate)

SHRI SHRll>HAR KRISHNAN K. S. Krishnan & Associates, New DelhiSUI - K. S. KRISHNAN ( Alternate)

SHRI V. LAKSHMIKANTHAN Khadi & Village Industries Commission, BombaySHRI K. C. MATHUR Shriram Foods & Fertilizer Industries, New Delhi

SHRI K. P. SHARMA ( Alternate )DR N. L. MURTHY

DR V. B. DESAI ( Alternate)SURI B. M. NATARAJ

SURf C. G. HOSUR ( Alternate)SURI S. C. PANDEY

12

AMENDMENT NO.1 AUGUsr 1"1TO

IS 10523: 1'83 SPECIFICATION FOR BABY TOILETSOAP

(Pare 3,cllJlue 1.3,1.3 ) - Subllitute 'repnllO'/or '10 Jepnl'.

(Pa~ 3, cllJlUC 0.3, I. 7 ) - Delete the word '.Dd' .r the WOld'bleleriallaack'.

(Pllge 4, clause OA, lUtes 4 IIIId S) - Sut-lilule llow BIDiII'I. 'lowerJimill'.

(CHD2S )

Pnnted at NewIndll Pnnt1na Pre... IChwja, India

AMENDMENT NO. 2

TO

MAY 1992

18 10523:1983 SPECIPICATION PORBABY TOILET SOAP

(Page 3, Foreword, clause 0.4)- Add the following afterclduse 0.4 and renumber the subsequent clause:

'0.5 A scheme for labelling environment friendly products to beknown as [CO Mark is being introduced at the instance of the Min­iutry of EnVlronmant and Forusts (M~~). The ECO Mdrk shdll be dd­m: lster~d by tho Burcdu or Indian Standards (DIS) under the ~lS

Ac.'l, lYUb dS pe r the Re scLut ron No. 71 da t ed 20 I"'~bl'uclry 19~1

pub I Lunod in the Gazette of the Governm~nt of India. For d

ptoduct to be eligible for ECO Mark it shdll dlso carry the stan­ddrd mark of BIS for quality besides meeting additional optiondlenvironment friendly (EF) requirements. The ~f requirements lorbaby toilet soap are, therefore, being Included through Amend­m0nt No.2 to this standard

A proposdl to incorporate some more EF requirements in phases isalso under consideration and would be included in due course.'

(Page 5, clause 3.3.1) - Add the following after 3.3.1:

'3.4 optional Requir•••nt. for ECO Kark

3.4.1 General Requirements

3.4.1.1qua Lr ty,3.] .

The product shall conform to the requirements forsafety and performance prescribed under clauses 3.1 to

3.4.1.2 The manufdcturers shall produce to SIS environmentalconscrrt c Learance froan the concerned stelte Pollution ControlHoard as per the provisions of the Water (Prevention and Control01 Polluti~n) Act, 1974 and Air (Prevention and Control of Pollu­tion) Act, 1981 along with tho authorizcition, if required unUUI"the Environment (Protection) Act, 1986, while applylnq tor ~co

Mdrk.

1

3.4.2 SpeciLic Requirements

l.t.2.1 The material shall neither contain any synthetic deter­gent whan.t••ted .s per the method given in Annex Band C ot IS4955: 1982 nor any phosphate when tested as per the methodpr••cribed in 20 of IS 286:1978+.

3.4.2.2 Tha aatarial shall pas. the test for der.atoloqieal••fety when evaluated aa per the method prescribed inIS 13424:19921

(Page 5, clau•• 4.1) - Add the following after •• 1:

'4.1.1 For ECO Mark the. product shall be packed in such packageswhich are made from recyclable/reusable or biodegradablematerial. and declared by the manufacturer and may beaccompanied with detailed instructions tor proper use.'

(Page 6, clause t.2) - Add the following after •• 2 (f):

'(9) List of identified critical ingredients in descendingorder of quantity, percent by mass for ECO Mark,

(b) The criteria for which the product has been labelled asECO Mark'

• Specification for household laundry detergent powder:(Iecond revision)

+ Methods of sampling and test for soaps (second revision)

I Methods of test for safety evaluation of bathing bars antoilet soaps.

(CHD 025)

Printod at Now IndiaPrinting Pross, Khurj4, India

2

AMENDMENT NO. 3 MAY t 994TO

IS 10523: 1983 SPECIFICATION f4~OR

BABY TOILET SOAP

[ Page 2, Amendment No.2, clause 4.1 (g) J - Substitute the following forthe existing clause:

'4.% (g) The following identified critical ingredients III descending order ofquantity, percent by mass, for ECO Mark:

i) Total fatty Inaner(fFM), and

ii) Water insoluble matter.'

(CHD 25)Pnnted at New IndIa Pnnttna Press. KhufJa. IndIa

IS I 10513· 1983

total fatty matter, lower limits for free caustic alkali and free carbonatedalkali and lower limits for heavy metals, namely, nickel, copper and ironhave been prescribed.

0.5 This standard contains clause 4.1 which calls for agreement between thepurchaser and the supplier.

0.6 For the purpose of deciding whether a particular requirement of thisstandard is complied with, the fioal value, observed or calculated, expressingthe result of a test or analysis. shall be rounded off in accordance withIS: 2-1960*. The number of significant places retained in the rounded offvalue should be the same as that of the specified value in this standard.

1. SCOPE

1.1 This standard prescribes requirements and methods of sampling andtest for toilet soap.

2. TERMINOLOGY

2.1 For the purpose of this standard, the definitions given in IS : 286 - 1978tand IS: 7597-1974: shall apply.

3. REQUIREMENTS

3.1 Description - Baby toilet soap shall be a high grade, thoroughly saponi­fied, milled soap or homogenized soap or both, white or coloured, mildlyperfumed or un perfumed, and compressed in firm smooth cakes. It shallpossess good cleaning and lathering properties. It shall be free fromrancidity.

3.1 IDgredients - Baby toilet soaps shall contain only the following:

Colouring matter, perfume, preservatives and super fatting agents. Allother ingredients except moisture shall be declared on the label. Allthese materials shall be non-injurious to skin in use with soap.

3.3 Baby toilet soap shall also comply with the requirements specified inTable 1.

*Rule. for rounding off numerical values ( revlsed).tMethods of sampling and test for soaps ( second revlston ).tOlossary of terms relating to surface active agents.

4

IS : 10523 - 1983

A

B

CD

(6)

23

7

2

s

6

10

0·5

0·03

To passthe testTo pass

the test

Nil10

3

0'5

IS-O

( 3 )78·0

TABLE I REQUIREMENTS FOR BABY TOILET SOAP( Clause 3.3 )

REQUIREMENTS MI:.7HOD 0' TeST, REF TO

r-----~-----~CI No. in CI No. AppendixIS : 286 • in IS : 74 -1978* J979t

(4) (5)15

CHARACTERISTIC

Ix) Freedom from grit

x) Nickel content

xi) Iron content, parts per million, Max

xii) Copper ( a, Cu ) contents, partsper million, Max

*Methods of sampling and test for soaps ( second revlslon ).tMcthods of samplina and lest {or drying oifs for paints ( second revision ).

(I) (2)i) Total fatty matter, percent by

mass, Min

li) Moisture and volatlie matter( at 10SoC ), percent by mass, Max

iii) Matter insoluble in alcohol,percent by mass, Max

iv) Matter insoluble in water, percentby mass, Max

v) Free caustic alkali, as sodiumhydroxide ( NaOH ), percent bymass, Max

vi) Chlorides, as sodium ch loride( NaCI ), percent by mass, Max

vii) Free carbonated alkali, percent bymass,Max

viii) Freedom from rosin

SL No.

3.3.1 Calculation 0/ Results - Baby tiolet soap is liable to lose moistureon keeping. The results of analysis in respect of other characteristics shallbe recalculated in relation to the minimum specified total fatty matter bymeans of the equations:

Recalculated result == Actual result X Minimum specified total fatty matterActual total fatty matter

4. PACKING AND MARKING4.1 Packing - The material shall be packed as agreed to between thepurchaser and the supplier.

s

IS I 10523 • 1983

4.2 Marti...~The packages shall be securely closed and labelled in con­formity with the statutory requirements of the Government of India asapplicable from time to time and the following:

a) Name of the materia);b) Manufacturer·s name and address and/or his recognized trade-mark,

if any;c) Net mass when packed;d) Total fatty matter content;e) Batch No. or Lot No. in code or otherwise; andf) Month and year of manufacture.

4.2.1 The packages may also be marked with Standard Mark.

4.3 TIle use of tbe Standard Mark is governed by the provisionsof Bureau ojIndian Standards Act, 1986 and the Rules and Regulations made thereunder.The details of conditions under which the licence for the use of Standard Markmay be gnnted to manfucaturers or producen maybe obtained from tbe Bureauof Indian Standards.

s, SAMPUNG

S.1 For this purpose, scale of sampling and preparation of test samplesshall be as prescribed in 3.1,3.2, and 3.3 respectively of IS : 286· 1978*.

5.2 Number of Tests

5.2.1 Tests for the determination of total fatty matter and free causticalkali shall be conducted on each of the individual samples separately.

S.2.Z Tests for determination of all the remaining characteristics shall beconducted on the composite sample.

5.3 Criteria for CoDformlty

5.3.1 For Individual Samplet- For each of the characteristics which hasbeen determined on the individual samples ( 5.2.1 ) the mean ( s) and therange ( R ) of the test results shall be calculated as follows:

Mean (R) 1:1 The sum of the test resultsNumber of test results

RaDge ( R) = The difference between the maximum and the minimum. values of the test results

.Methods of aampJJDI and testfor soaps( s.coNl milioll ).

6

IS t 10523 - 1983

The lot shall be deemed as conforming to the requirements given in S.2.1if the expression ( ~ - 0·6 R ) is greater than or equal to minimum valuegiven in Table 1, and (~ + 0·6 R) is less than or equal the maximum valuegiven in Table I.

5.3.1 For Composite Sample - For declaring the conformity of lot to therequirements of other characteristics determined on the composite sample,the test results for each of the characteristics shall satisfy the relevantrequirements.6. TESTS6.1 Tests shall be conducted as prescribed in IS : 286 - 1978*, IS : 74· 1979tand Appendices At B, C and D. References to the relevant clauses ofIS: 286· 1978*, IS : 74· 1979t and appendices are given in eols 4, Sand 6of Table I.6.1 Quality of Rellents - Unless specified otherwise, pure chemicals anddistilled water ( see IS: 1070 - 1977: ) shall be employed in the tests.

NOT! - 'Pure chemicals' shall mean chemicals that do not contain impuritieswhich affect the results of analysis.

APPENDIX A[ Table 1. Item ( ix )]

TEST FOR FREEDOM FROM GRIT

A-o. OUTLINE OF THE METHOD

A-G.l Soap is rubbed with water between the hands for a specified timeand examined for its gritty or rough feel, if any.

A-I. PROCEDUREA-l.l Hold a bar of soap in running tap water and rub between both handsfor about 3 minutes. No gritty or rough feel should be perceived whilerubbing the soap surface. Examine the surface of the bar which shall Dotbe rough and shall feel smooth when the fingers are moved across thesurface. Set the bar OD and let it dry for 24 hours at room temperature andexamine its surface.A-l.2 The soap shall be takeD to have passed the test if there is no Iritty orroulh feel on the surface.

• Methods of samplinl and test for soaps ( $~CQnd Nvlslon ).'fMclhods of samplin. and telt for drylnl oils for paints ( ,«ond nl'ls/DII).:SpeclftcatioDfor water for aenerallaboratory use ($.cond ,..,11/011).

7

IS : 10513 - 1983

APPENDIX B

[ Table 1, ltem ( x )]

DETERMINAI'ION OF NICKEL

B-O. OUrrJ.JINE 0.' THE MErrllOD

B-O.l The method is based on the isolation of metal from the soap andreaction between nickel in the oxidized form with dimethyl glyoximeforming a red colour.

B-1. REAGI4:NTS

B-l.1 Sodium Hydroxide - AR grade.

B-l.2 Concentrated Hydrochloric Acid - Conforming to IS: ~65 -1976*.

B-l.3 Dimethyl Glyoxime Solution -- 0·1 percent ( vlv) in 95 percent ethylalcohol.

B-l.4 Saturated Bromine Water

B-l.5 Liquor Ammonia - Relative density 0·9.

B-2. PROCEDURE

B-2.1 Isolation of Metals from Soap - Weigh 50 g of soap in a beakerand dissolve in hot water. Add to this soap solution 40 fill of concentratedhydrochloric acid, stir and keep on steam bath until fatty acid layer separa­tes. Add 20 g of paraffin wax, stir at intervals and allow it to settle untilphases are clear. Cool to room temperature.

B-2.1.1 Remove wax cake with rod, rinse with water and add rinsings toaqueous phase. Evaporate aqueous phase to about 60 ml by gentle boiling.Add 100 ml of water and filter through paper washed previously withhydrochloric acid. Evaporate filtrate and washings to about 60 ml, Cool andtransfer to volumetric flask. Make up the volume to 100 ml, Take aliquotportions for metal estimation.

8-2.1 Determination of Nickel Content - Take 50 ml aliquot of the aqueoussolution from the test solution in a 250-ml beaker. Evaporate the solutionto about 15 rot by heating. Transfer the solution to a 50-rot glass stopperedvolumetric flask using a small quantity of water for rinsing the solutionfrom the beaker into the volumetric flask. Add to the flask 3 ml of saturatedbromine water and allow to stand for one minute. Add liquor ammonia

·Specification for hydrochloric acid ( secondrevision ).

IS : 10523 - 1983

dropwise until excess bromine is destroyed as indicated by the disappear­ance of brown colour. Then add 5 ml of liquor ammonia in excess, If aprecipitation occurs, filter the solution and wash the precipitate with distilledwater; combine the filtrate and the washings and concentrate to a volumeof a few millilitres and transfer to a 50-rol volumetric flask. Add 10 ml ofdimetyl glyoxime solution, followed by 15-20 ml of95 percent ethyl alcohol.Mix thoroughly and make up the volume and again mix thoroughly. Allowthe solution to stand for 5 minutes to permit fun development of colour.The sample shall be considered to have passed the test if no pink colourdevelops.

APPENDIX C[TaiJ/e ], Item ( xi)]

DETERMINATION OF IRON

C-O. OUTLINE OF THE 1\1ETHOD

C-O.l The method is based on the isolation of metal from the soap by dis­solving in hot water. The aqueous extract is treated with citric acid tosequester aluminium and then thioglycolic acid in ammoniacal solution isadded and colour measured spcctrophotometrically.

C-l. APPARATUS

C-l.1 Spectrophotometer

C-2. REAGENTS

C-2.1 Liquor Ammonia - Relative density 0·9.

C-2.2 Sulpburic Acid - 50 percent ( l'/lJ ).C-2.3 Citric Acid ( Aqueous Solntion ) - 50 percent (l'lv ).

C-2.4 Tbioglycolic Acid ( Aqueous Solution) .

C-2.5 Standard Iron Solution - Containing 10 /l.g of iron per ml preparedfrom ferric ammonium sulphate rFe2 ( 804 )3· (NH4 )2 504. 12H20] in acidsolution.

C-2.6 Methyl Red Indicator - 0·1 percent aqueous solution.

C-J. PROCEDURE

C-3.1 Isolation of Metals from Soap - Weigh SO g of the soap sample in abeaker and dissolve it with hot water. To this soap solution add 40 ml of

9

IS : 10523 - 1983

concentrated hydrochloric acid with constant stirring and keep the beakeron steam bath until fatty acid layer separates. Add 20 g of paraffin wax tothis solution while hot. Stir the solution at intervals and allow it to settleuntil phases arc clear. Cool the mass to room temperature. Remove the waxcake with rod, rinse with water and add the rinsings to aqueous phase.Evaporate the aqueous phase to above 60 ml by gentle boiling. Add 100 mlof water and filter through paper washed previously with hydrochloric acid.Evaporate the filtrate and washings to about 60 mI. Cool and transfer thesolution to a volumetric flask and make up the volume to 100 ml. Takealiquot portion of the solution for metal estimation.(~-3.2 Determination of Iron - Take 5 ml aliquot of the aqueous solutionfrom the test solution in a 25·lnl volumetric flask. To this add 4 ml citricacid solution and 0·02 mt methyl red indicator and liquor ammonia tillthe colour of the solution turns yellow. Then add 3 ml liquor ammonia inexcess. Cool the solution and add 3 ml thioglycolic acid. Make up thevolume to 25 ml and mix the solution thoroughly. Filter the solutionthrough acid washed and dried filter paper. Measure absorbance of the clearsolution at 540 nm in the spectrophotometer using water as reference.Prepare a calibration curve with standard iron solution and determine theiron content of the soap sample from it.

APPENDIX D[ Tahle 1, 11('111 ( xii )]

1)}~TERMINArrION OF COPPER

D-O. OU rr LI NI4: OF 'rn..: l\1.~TlfOI)

1)-0.1 The method is based on the isolation of metal from the soap and tomake a copper complex using zinc dibcnzyl dithiocarbamatc in carbontetrachloride solution and measure the colour of the solution spcctrophoto­metrically.

0-1. APPARArrUS

n.r, t Spectrophotometer

)-2. REAGENT

D-2.1 Zinc Dibenzyl Dithiocarbamate Solution·- 0'05 percent in ( lllv) incarbon tetrachloride,

1)·2.2 Standard Copper Solution - Containing 1 Jlg of copper per ml ( pre­pared from a stock solution of 100 I imes the concentration ).

10

IS : 10523 - 1983

D-3. PROCEDURE

D-3.1 Isolation of Metal from Soap -- Weigh 50 g of soap 4\ I In plc In a beakerand dissolve it with hot water. To this ~O,lP solution 1.1Jd 40 ml or con­ccntrated hydrochloric aud with constant strrrrng and keep the beaker onsteam bath until fatty acid layer separates Add 20 g of paraffin wax to thissolution while hot Stir the voluuon at Intel vals and allow It to settle untilphases are "lear. Cool the mass to rOOI11 temperature. Remove the wax cakewith rod, nnsc with water and add the rrnsmgv to aqueous phase Evaporatethe aqueous phase to about 60 ml bv gentle boilmg Add 100 ml of waterand filter through filter paper washed prcviouvly with hydrochloric acrd.Evaporate the filtrate and wavlungs to about 60 In) Cool and transfer thesolution to a volumctnc fla-k .md made up the volume to 100 ml, Takealiquot poruon of the solution for mct.il cstimat .on.

D-3.2 Determination of Copper -ll.lkc 20 1111 aliquot of the ..lqUCOU~ solu­non and to It add 10 rnl at zinc dcbcnzyl ditluoc arb..imate voluuon followedby 25 1111 sulphunc acid III a scparaung tunnel. Shake the <olutron tor onemmute and allow it to settle Run the lower carbon tcn achlorrdc layer III

to a 25-ll11 volumetric flask Wa-h the 1.1qUCOU' layer with carbon tetra­chlondc and transfer through glas-wool to volumctnc fla-k. Make up thevolume and mix well. Mea-an c absorption of the clear volutron at 435 nmIn the vpcctrophotometcr. Prepare ,1cahbrauon (.UI ve with standard coppersoluuon and dctcrrrune the copper content of the 'OdP sample from thecurve,

NOTE - The vtandard -oluuon shall also be C\lfJLtCJ wuh carbon tctr.u hlor rdcbefore evum.mon of colour

11

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21 68 76

23 89 23

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52 51 71323635

·Sales Office IS at 5 Chownnghee Approach. P 0 Pnncep Street,CALCUTIA 700072

tSales Office IS at Novelty Chambers. Grant Road, MUMBAI oo7סס4

*Sal8s Office IS at ·F' Block, Unity BUilding, NarashlmarBja Square,BANGALORE 560002

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