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IS 4203 (1967): Method for determination of sulphate

content in textile materials [TXD 5: Chemical Methods of
Test]

“!ान $ एक न' भारत का +नम-ण”

Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह”

है”
ह
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“Knowledge is such a treasure which cannot be stolen”
 Is:4203-1967
(Reaffirmed 2004)
Indian Standard
METHOD FOR DETERMINATION OF
SULPHATE CONTENT IN TEXTILE MATERIALS

( Second Reprint NOVEMBER 1988 >

-\
:
-/ UDC 677.01:543:546.226

@ CopVight 1967

BUREAU OF INDIAN STANDARDS

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARC3
NEW DELHI 110002

Gr 2 September 1967
 IS : 4203 - 1967

Indian Standard
METHOD FOR DETERMINATION OF
SULPHATE CONTENT IN TEXTILE MATERIALS

Textile Chemist& Sectional Committee, TDC 5

Chairman Representing
Da P. C. aliTA Ahmedabad Textile Industry’s Research Association,
Ahmedabad

Members
SHRI K. D. BAHADURJI Textile Auxiliaries Manufacturers’ Association,
Bombay
DR S. M. BETRABET The Cotton Technological Research Laboratory
( ICAR ). Bombay
SHRI K. S. BHUJANG Office of the TextileCommissioner, Bombay _
SHRIB. B. CHAKRAVERTI Superintendence. Company of India ( Private)
Limited, Calcutta
SH& R. C. BA~XHI (Alternate)
DASCUPTA
SHRI I$. C. National Test House, Calcutta
DIRECZOR OF HANDLOOMS Government of Madras
SHRI K. ]RA@dAMJRTH?Z
( Altmurtc )
DR A. S. DUTT Indian Jute Industries’ Research Association,
Calcutta
SHRI S. K. DIJTTA Ahmedabad Manufacturing & Calico Printing Co
Ltd, Ahmedabad
SHRI GUNVANTMANGALDAS Ahmedabad Millowners’ Association, Ahmedabad
DR V. P. KULKARNI All India Handloom Board,. Bombay
Snm L. G. MAKHIJANI Indian Rope Manufacturers’ Association, Calcutta
SHRI A. K. Grios~ ( Alternate )
SHRI S. B. MEWCA The Bombay Textile Research Association, Bombay
SHRI S. S. i%fEIiTA ICI ( India ) Private Ltd, Calcutta
Snar V. J. VAISHNAV ( Alternate )
DR S. H. MHATRE The Bangalore Woollen, Cotton & Silk Mills Co
Ltd, Bangalore; and the Buckingham & Carnatie
Company Limited, Madras
SHRI S. M. MISTRY Association of Merchants & Manufacturers of Textile
Stores & Machinery, India, Bombay
DR C. N. K. h~uktTxiY Ministry of Defence ( DGI )
SHRI C. L. GUPTA ( Alternate )
SHRI P. S. NADYARP~I Ministry of Defence ( DC1 )
DR V. N. NIGAM Ministry of Defence ( R & D )
SHRI N. D. BHANDARI( Alternate )
DR M. V. NIMKAR The Millowners’ Association, Bombay
DR R,V. PARIKX The Bombay Textile Research Association, Bombay
SHRI GORDELWBHAI H. PATEL Shri Dinesh Mills Ltd, Baroda
( Continuedon page 2 )

BUREAU OF XNDIAN STANDARDS

MANAK BHAVAN, g BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
 ( Continucd~fom page1 )
Members Representing
SHRI I. L. PATEL Inspection Wing, Directorate General of Supplies & :
Disposals { Ministry of Works, Housing &
supply ) . . .
SHRI A. K. PRAMANICK( Altumate )
SHRI Y. G. PATHAK The Textile Processors’ Association ( India ), Bombay
SHARI G. R. PODAR Silk & Art Silk Mills’ Association Ltd, Bombay
SHRI J. G. PARIKH ( Alternab )
REPUSENTATIVE Directorate of Industries, Government of Punjab
REPRILTENTATIVE Shri Ram Institute for Industrial Research, Delhi
SHRI JAMNADASK. SHAH The Raipur Manufacturing Co Ltd, Ahmedabad
SHRI R. C. SHAH The Ahmedabad Textile Industry’s Research
Association, Ahmedabad
SHRI S. J. SHAH Association of Merchants & Manufacturers of Textile
Stores & Machinery, India, Bombay
SHRI G. V. SHIROLKAR The Delhi Cloth & General Mills Co Ltd, Delhi
DR R. V. R. SUBRAMANIAN The Silk & Art Silk Mills’ Research Association,
Bombay
SHRI S. M. CHAKRABORTY, Director General, BIS ( Ex-a.#& Member )
Director ( Tex )
Secretary
SHRI G. S. ABHYANKAR
Deputy Director ( Tek ), BR3k

Undyed Textile Materials Subcommittee, TDC 5 :2

Convener
SHRI R. C..SHAH Ahmedabad Textile Industry’s Research Association,
Ahmedabad

SHRI G. G. KULKARNI(Alternate to
Shri R. C. Shah )
DR ( KUMARI) M. D. BHAVSAR The Silk & Art Silk Mills Research Association,
Bombay
SHRI B. B. CHAKRAVERTI Supez;;;tp Company of India ( Private ) Ltd,

SHRI R. C. BAGCHI( Alternate )

* SHRI R. J. CH~KTE The Khatau Makanji Spinning & Weaving Co Ltd,
Bombay
SHRI C. L. GUPTA Ministry of Defence ( DGI )
SHRI B. K. KEDIA The Raymond Woollen Mills Limited, Bombay
SHRI K. MANIVANNAN Shri Ram Institute for Industrial Research, Delhi
DR V. N. NICAM Slinistry of Defence ( R 8r D )
SHRI N. D. BHANDARI( Jllernaie.\,
Da D. V. PARtKH The Bombay Textile Research Association, Bombay
REPRESENTATIVE Directorate of Industries, Government of Punjab
SHRI JAMNADASK. SHAH Raipur Manufacturing Co Ltd, Ahmedabad

2
 IS : 4203- 1967

Indian Standard
METHOD FOR DETERMINATION OF
SULPHATE CONTENT IN TEXTILE MATERIALS

0. FOREWORD
0.1 This Indian Standard was adopted by the Indian Standards Institution
on 31 July 1967, after the draft finalized by the Textile Chemistry Sectional
Committee had been approved by the Textile Division Council.
0.2 In textile industry, textile materials undergo various treatments in
course of which extraneous matter of various types, such as, sizing or
finishing material, and water-soluble salts ( chlorides and sulphates) is
gathered by or added to the textile materials. Such water-soluble subs-
tances, if present, in more than certain quantities may have deleterious
effect on the fibrous material or on other materials with which they are
associated in use and may, therefore, it aflect their performance in service.
It is hoped that this standard will be useful for determining the sulphate
content in aqueous extract of textile materials.
0.3 The gravimetric and volumetric methods for estimating the sulphate
content in textile materials are prescribed in this standard.
0.4 In reporting the result of a test made in accordance with this standard,
if the final value, observed or calculated, is to be rounded off, it shall be
done in accordance with IS : 2-1960*.

1. SCOPE
1.1 This standard prescribes the methods for determination ofwater-soluble
sulphate present in textile materials, and the procedure for extracting the
textile materials with water.

2. PRINCIPLE
2.1 The aqueous extract of textile material is prepared, the sulphate
content is determined, either gravimetrically or volumetrically and expressed
as the percentage of the weight of the conditioned material.

3. SAMPLING
3.1 Sampling for Fibre and Yarn
3.1.1 Lot ( Fibre or Yarn ) - The quantity of fibre or yarn from the same
source shall constitute a lot. If the lot contains more than 200 kg. of fibre
or yarn, it shall be divided in sub-lots each weighing 200 kg or less,
*Rules for rounding off numerical values ( v~hed).

3
IS:4203-1967

3.1.2 From a sub-lot 15 increments each approximately weighing 10 g

shall be taken from different parts so that a representative sample is
obtained. All the increments thus collected shall be thoroughly mixed.
This shall constitute the test sample.

3.2 Sampling for Fabrics

3.2.1 Lot ( Fabric ) - The quantity of fabric manufactured under
relatively uniform conditions shall constitute a lot.

3.2.2 The number of pieces to be selected from a lot shall be as given

below. The pieces thus selected shall constitute the gross sample.
Lot Size Sample Size
up to 100 3
101 ,, 300 4
301 ,, 500 5
501 and above 7

3.2.3 From each piece in the gross sample about 25 g of fabric shall be
taken out from at least two different parts. The parts shall then be cut
into further smaller pieces and thoroughly mixed. The pieces thus
collected shall constitute the test sample.

4. TEST SPECIMENS

4.1 From the test sample draw at least two test specimens each weighing
about 10 g. Cut the test specimens into small pieces. If the sample under
anarysis d foose f%re, take about 5 g of tAe test speciinen.

5. CONDlTIONING OF TEST SPECIMENS

5.1 Prior to test, the test specimens shall be conditioned for 24 hours to
moiiture equilibrium in a standard atmosphere at 65 & 2 percent relative
humidity and 27” 5 2°C (see also IS : 196-1966* ).

6. APPARATUS

6.1 Flat-Bottom Flask - of a suitable capacity with a glass stopper.

6.2 Water-Cooled Condensers

6.3 Goock Crucible - with asbestos pad.

*Atmospheric conditions for testing ( revised ).

4
 Isr4!203-1967

7. QUALITY OF REAGENTS

7.1 pure chemicals shall be employed tests

and distilled water (see : 1070-1960* ) shall be used where the use of
water as reagent is intended.
NOTE - r Pure chemicals ’ shall mean chemicals that do not contain impurities which
affect the test results.

8. PREPARATION OF AQUEOUS EXTRACT

8.1 Condition the test specimens to moisture equilibrium in the standard

atmosphere and weigh accurately each test specimen.
8.2 Put a test specimen in the flask and add sufficient amount of water
into it to make liquor to material ratio of 20 : 1 ( see Note ). Connect the
flask to the condenser and bring rapidly to the boil and continue to boil
the liquor gently for 60 minutes. Disconnect and remove the flask while
the liquor is still boiling and close it immediately with the glass stopper
fitted with the stopcock. Rapidly cool the flask to room temperature
( 27°C j. Do not remove or open the tap until ready for filtration.
NOTE- If the test specimen is wool in any form, felt or loose fibre masses of any
composition, the liquor to material ratio should be 50 : 1.

8.3 Similarly prepare separate extracts for each of the remaining test
specimens.

9. GRAVIMETRIC METHOD

9.1 Reagents
9.1.1 Barium Chloride Solution - 2 percent *( w/v).

9.1.2 Hydrochloric Acid - concentrated.

9.2 Proce’dure
9.2.1 Take a measured portion of extract. Filter through a suitable
filter paper ( see Note ) and wash the filter paper with distilled water. Add
concentrated hydrochloric acid.drop by drop to the combined filtrate and
washings until the solution is just acidic to litmus, then add 1 ml ofacid
per 100 ml of solution. Boil the solution for5 minutes and leave it to cool
overnight. Filter off any precipitate on a filter paper-pulp pad. Wash
with water and heat the combined filtrate and washings to boiling. To
the boiling solution add drop by drop 10 ml of hot barium chloride solu-
tion. Boil for 30 minutes and leave to cool overnight. Transfer the
*SpeciIication for water, distilled quality ( teuisJ ) ( Since revised ).

5
X5:4203-1967

precipitate quantitatively to an ignited tared Gooch crucible with asbestos

pad and wash with cold water until the washings are free from chloride.
Ignite the crucible and its contents gently at first and finally at 800” to
900°C to constant weight.
NOTE - Whatman No. 41 paper is suitable.

9.22 Carry out the blank determination.

9.2.3 Calculate the percentage of water-soluble sulphate by either of
the following formulae:
4 For all materials in yarn and fabric form other than wool (see
Note 1 ):

b) For wool in any textile form and for felts and loose fibre masses
of any composition ( see Note 2 ):
p= 2058 x (u-6)
V

where
P = percentage, by weight, of water-soluble sulphates as
sulphate ion;
a = weight, in g, of the precipitate obtained in the test ( see
9.2.1);
b = weight, in g, of &the precipitate obtained as in blank
( see 9.2.2 ) ; and
v = volume, in ml, Qf extract taken for the test.
NOTE 1 --- 100 ml of extract are equivalent to 5.0 g of conditioned
test specimen.
NOTE 2 - 100 ml of extract are equivalent to 2.0 g of conditioned
test specimen.

9.2.4 Repeat the test with the extracts of the remaining test specimens
and calculate the percentage of water-soluble sulphate in each test
specimen.

9.2.5 Calculate the average of the values obtained as in 9.2.3 and 9.2.4.

10. VOLUMETRIC METHOD

10.1 Reagents
10.1.1 Bxnzidine Hydrochloride Solution - prepared as hollows:
Dissolve 5 g of benzidine hydrochloride in 40 ml of 1 N hydro-
chloric acid and dilute the solution to 250 ml with 50 percent
aqueous ethanol * ( u/v ). Heat the solution to boil, cool, filter if
necessary, and store in a dark glass stoppered bottle.
 IS:4203-1967

10.1.2A!cohol-95percent (2)/v).
10.13 Standard Sodium Hydroxide Solution - 0.02 N.
10.1.4 Standard Sulphuric Acid - 0.02 N.
10.1.5 Pirenol Red Indicator - 0.25 percent ( w/v) prepared in 25 percent
ethanol ( v/v).

10.2 Procedure
10.2.1Take a measured portion of extract ( see 8.2 ) and concentrate it
to 20 ml. Add to this 20 ml of alcohol followed by 20 ml of benzidine
hydrochloride solution. Allow the solution to stand for 30 minutes.
Filter the solution under low suction through a. suitable filter paper
( see Note 1 ). Wash the precipitate with 5 ml of alcohol and repeat the
washing 4 times more. After the test washing transfer the precipitate and
filter paper to 250-ml conical flask and add 25 ml of distilled water. Add
few drops of phenol red indicator. Heat the solution to boiling and COOL
Add a known volume of standard sodium hydroxide solution to the con-
tents of the flask, shake thoroughly to dissolve all the precipitate, add more
phenol red indicator as required and back titrate the excess of sodium
hydroxide with standard sulphuric acid.
NOTE 1 - Whatman No. 42 paper is suitable.
NOTE 2 -The accuracy of the above method may be checked by determining the
sulphur content in 2 ml of sodium sulphate solution of known strength. 2 ml of sodium
sulphate solution is taken in a beaker and 8 ml of alcohol is added. To this 4 ml of
benzidine hydrochloride is added. The solution is allowed to stand for 30 minutes.
The precipitate is filtered and titrated against 0.0‘2 N sodium hydroxide as above.

10.2.2Calculate the percentage of water-soluble sulphates by either of

the following formulae:
a) For all materials in yarn and fabric form, other than wool
( see Note 1 ):
p = L?L_B__-x 4*8 x 20
V
b) For wool in any textile form, and for felts and loose fibre masses of
any composition (see Note 2 ):
p = 21 x B x 4.8 x 5.
V
where
P = percentage, by weight, of water-soluble sulphate as
sulphate ion;
_I = volume, in ml, of standard sodium hydroxide solution;

7
IS : 4203- 1967

B = normality of sodium hydroxide solution; and

V = volume, in ml, of the extract.
NOTE l- 100 ml of extract are equivalent to 5-O g of conditioned
test specimen.
NOTE 2 - 100 ml of the extract are equivalent to 2-O g of condi-
tioned test specimen.

10.2.3 Repeat the test with the remaining test specimens and calculate
the percentage of water-soluble sulphate in each test specimen.
10.2.4 Calculate the average of the. values obtained as in 10.2.2
and 10.2.3.

11. REPORT

11.1 Report the values obtained as in 9.2.5 or 10.2.4 as the percentage of

sulphate content as sulphate ions in textile materials.
NOTE-If the percentage of water-soluble sulphate is to be expressed as sodium
sulphate, multiply P by l-48.

11.2 Report also the method used ( whether gravimetric or volumetric ).

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