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“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 14781 (2000): Sodium Thiosulphate [CHD 1: InorganicChemicals]

IS 14781:2000

Indian Standard

SODIUM THIOSULPHATE - SPECIFICATION

ICS 7 I .060.0 1

0 BIS 2000

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

March 2000 Price Group 5

General Inorganic Chemicals Sectional Committee, CHD 3

FOREWORD

This lndian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the General Inorganic Chemicals Sectional Committee had been approved by the Chemical Division Council.

Sodium thiosulphate in crystalline form is commonly known as ‘hypo’ and is extensively used in the photographic industry as a fixing agent to dissolve unchanged silver salts from exposed negatives. It is also used widely as laboratory reagent in titremetric analysis.

This standard covers only the technical, pure and analytical reagent grade of the material. The photographic grade material has been covered under a separate standard, IS 246 : 1986 ‘Sodium thiosulphate, crystalline, photographic grade Vourth revision)‘.

There is no IS0 specification for this subject. This standard has been prepared based~on indegineous manufacturers’ data/practices prevalent in the field in India.

Composition of the Committee responsible for formulating this standard is given in Annex L.

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values (revised)‘. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

IS 14781 : 2000

Indian Standard

SODIUM THIOSULPHATE - SPECIFICATION

1 SCOPE

This standard prescribes requirements and methods of sampling and test for sodium thiosulphate, technical, pure and analytical reagent.

2 NORMATIVE REFERENCES

The Indian Standards listed below contain provisions which through reference in this text, constitute provisions of this Indian Standard. At the time of publication, the editions indicated were valid. All standards are subject to revisions, and parties to agreements based on this Indian Standard are encour- aged to investigate the possibility of applying the most recent editions of the Indian Standards.

IS No. 265 : 1993 266 : 1993

1070 : 1992 2088 : 1983

2316 : 1990

3 GRADES

Title Hydrochloric acid yburth revision) Sulphuric acid (third revision) Reagent grade water (third revision) Methods for determination of arsenic (second revision) Methods of preparation of standard solutions for calorimetric and volumetric analysis (second revision)

The material shall be of the following three grades :

a) Technical,

b) Pure, and

c) Analytical reagent.

4 REQUIREMENTS

4.1 Description

The material of all grades shall be in the form of colourless crystals or crystalline powder, free from extraneous impurities.

4.2 Solution in Water

A freshly prepared aqueous solution of the material of any grade containing 40 g of the material in 100 ml of carbon dioxide-free water shall be clear and free from sediment other than a slight flocculence.

4.3 The material shall also comply with the requirements given in Table 1, when tested according to methods prescribed in Annexes A to J. Reference to the relevant Annexes is given in co1 6 of the Table 1.

5 PACKING AND MARKING

5.1 The material of the technical grade shall be packed in suitable waterproof lined containers.

5.2 The material of the pure and analytical reagent grades shall preferably be packed in hard-glass bottles with air-tight stoppers.

Table 1 Requirements for Sodium Thiosulphate (Clauses 4.3 and 5.3.1)

Sl No.

(1)

9

ii)

iii)

iv)

v)

VI)

vii)

viii)

IX)

Characteristic

(2)

Sodium thiosulphate (as Na2S203.5H20). percent by

mass

pH of IO percent solution

Insoluble matter and metals other than alkali metals, percent by mass, Mar

Sodium sulphide (as Na.$G), percent by mass, Mar

Heavy metals (as Pb), percent by mass, Mar

Iron (as Fe), percent by mass, Mnr

Calcium (as Ca). percent by mass, MUX

Sulphate and sulphite (as SO4), percent by mass, Max

Arscn~c (as As$I3), percent by mass, Mar

Requirement for Grade

Technical

(3)

97 to 101

Pure Analytical Reagent

(4) (5)

99.0 to 101 .o 99.0 to 101.0

6.0 to 8.5 6.0 to 7.5 6.0 to 7.5

Nil Nil Nil

-

0.05

-

-

- 0.001

0.002 5 0.001

- 0.000 5

To pass test 0.005

- 0.01

0.00 I 0.001

Method of Test (Ref to

Annex)

(6)

A

B

C

1

IS 14781 : 2000

5.3 The containers shall be securely closed after filling and marked with the following details:

a> b) c) 4

‘Indication of the source of the manufacture;

Grade and mass of material in the container;

Recognized trade-mark, if any; and

Batch number or the month and year of manufacture.

5.3.1 The analytical data of the material for the corresponding characteristics prescribed in Table 1 shall also be shown on the containers of the analytical reagent grade material.

5.3.2 BIS Certification Marking

The packages may also be marked with the Standard Mark.

The use of the Standard Mark is governed by the provisions of Bureau ofIndian Standards Act, 1986

and the Rules and Regulations made thereunder. The details of conditions under which the licence for the use of Standard Mark may be granted to manufac- turers or producers may be obtained from the Bureau of Indian Standards.

6 SAMPLING

Method of preparing the representative test samples and the criteria for judging the conformity to this standard shall be as prescribed in Annex K.

7 QUALITY OF REAGENTS

Unless specified otherwise, pure chemicals and reagent grade water (see IS 1070) shall be employed in tests.

NOTE - ‘Pure chemicals’ shall mean chemicals that do not contain impurities which affect the results of analysis.

ANNEX A

[Table 1, Sl flu. (i)]

DETERMINATION OF SODIUM THIOSULPHATE

A-l OUTLINE OF THE METHOD

The sodium thiosulphate content is determined by titrating a solution of the material with standard iodine solution, using starch as indicator.

A-2 REAGENTS

A-2.1 Starch Solution

Triturate 5 g of starch and 0.01 g of mercuric iodide with 30 ml of water in a mortar. Pour the resulting paste into one litre of boiling water, boil for 3 min, allow the solution to cool and decant off the clear liquid.

A-2.2 Standard Iodine Solution

0.1 N (see IS 23 16).

A-3 PROCEDURE

Weigh accurately about 1 g of the material and dissolve in 50 ml of water. Titrate the solution with standard iodine solution using starch solution as indicator, the end point being indicated by the appearance of blue colour.

A-4 CALCULATION

Sodium thiosulphate (Na,S,O,.SH,O), 24_a Mv percent bv mass Z-c--

4

M where

V =

N =

M=

volume in ml of standard iodine solution used in the titration,

normality of standard iodine solution, and

mass in g of the material taken for the test.

2

IS 14781 : 2000

ANNEX B

[Table 1, SZ No. (ii)]

DETERMINATION OF pH of 10 PERCENT SOLUTION

B-l GENERAL

Two methods have been prescribed for determination of pH, namely, pH meter method (Method A) or by the indicator method (Method B) however, in case of dispute, the pH meter method shall be the referee method.

B-2 METHOD A (PH METHOD)

B-2.1 Apparatus

B-2.1.1 pH meter with glass electrode.

B-2.2 Procedure

Dissolve 5 g of the material in freshly boiled and cooled water, dilute to 50 ml and mix. Determine the pH value of the solution using a pH meter with glass electrode.

B-3 METHOD B (INDICATOR METHOD)

B-3.1 Reagents

B-3.1.1 Indicators

A list of indicators suitable for the determination of pH value is given below :

a) Thymol blue (acid range) pH 1.2 to 2.8, red to yellow

b) Bromophenol blue pH 2.8 to 4.6, yellow to blue violet

c) Bromocresol green pH 3.6 to 5.2, yellow to blue

d) Methyl red pH 4.2 to 6.3, red to yellow

e) Bromocresol purple

f) Bromothymol blue

g) Phenol red

h) Cresol red

pH 5.2 to 6.8, yellow to b_lue violet

pH 6.0 to 7.6, yellow to blue

pH 6.8 to 8.4, yellow to red

pH 7.2 to 8.8, yellow to red

j) Thymol blue (alkali pH 8.0 to 9.6, range) yellow to blue

B-3.1.2 Standard calibrated -glass discs may also be used for comparison.

B-3.1.3 Test Temperature

The test shall be carried out at 27 f 2°C.

B-3.2 Procedure

In a hard-glass tube, place 10 ml of the solution prepared .by dissolving 10.0 g of the material in 100 ml of carbon dioxide free water. Determine the approximatepH by using a universal indicator. Repeat using a solution of the indicator (about one twentieth of the volume of the liquid being tested) which corresponds to the approximate pH found. Compare the colour produced with a series of buffer tubes of known pH, each containing the same proportion of the indicator.

B-4 The pH of the buffer solution, which matches with that of the material, shall be reported as pH of 10 percent solution of the material.

3

ANNEX C

[T&e 1, SZ No. (iii)]

DETERMINATION OF INSOLUBLE MATTER AND METALS OTHER THAN ALKALI METALS

C-l OUTLINE OF THE METHOD

Absence of the insoluble matter and metals other than alkali metals is qualitatively detected by mixing the material with water, adding ammonium oxalate, ammonium phosphate and ammonium hydroxide to the solutionThe material shall be taken to pass the test if no turbidity is obtained.

C-2 REAGENTS

C-2.1 Ammonium Oxalate Solution

4 percent.

C-2.2 Ammonium Phosphate Solution

10 percent.

C-2.3 Dilute Ammonium Hydroxide Solution

1:9 (v/v).

C-2.4 Dilute Ammonium Hydroxide Solution

1:39 (v/v).

C-3 PROCEDURE

Dissolve about 10 g of the material, accurately weighed, in 75 ml of water. Add 5 ml of ammonium oxalate solution, 2 ml of ammonium phosphate solution and 10 ml of dilute ammonium hydroxide (1:9). Allow it to stand for 4 h for development of any turbidity.The sample shall be taken to have the requirement of this test if no turbidity is obtained.

ANNEX D

[Table 1, Sl No. (iv)]

TEST FOR SODIUM SULPHIDE

D-l OUTLINE OF THE METHoD

Colour produced with alkaline lead acetate solution is compared with the colour produced with standard sulphide solution under identical conditions.

D-2 APPARATUS

D-2.1 Nessler Tubes

50 ml capacity.

D-3 REAGENTS

D-3.1 Sodium Hydroxide Solution

10 percent.

D-3.2 Lead Acetate Solution

10 percent.

D-3.3 Alkaline Lead Acetate Solution

Add sufficient amount of sodium hydroxide solution to lead acetate solution to dissolve the precipitate and provide a slight excess of sodium hydroxide.

D-3.4 Standard Sulphide Solution

Dissolve about 15 g of sodium sulphide (Na,S.gH,O)

in water and dilute to 500 ml in a volumetric flask. Pipette out 20 ml of the~solution in a conical flask and add 50 ml of 0.1 N iodine solution to it. Keep for 5 min and titrate with 0.1 N sodium thiosulphate solution. Apply a correction for the blank determination. One millilitre of 0.1 N iodine solution corresponds to 0.012 0 g of sodium sulphide (Na,S.9H,O). Dilute in a volumetric flaska volume of sodium sulphide solution containing 3.075 g of sodium sulphide (Na,S.9H,O) to 1 000 ml. Further dilute 10 ml of this solution to 1000 ml in a volumetric flask. One millilitre of the diluted solution contains 0.01 mg of sodium sulphide (as Na$).

D-4 PROCEDURE

Dissolve 2.000 g of the material in 10 ml of water and add 0.5 ml of alkaline lead acetate solution. Transfer to a Nessler tube and dilute to 50 ml and mix well. Carry out a control test in another Nessler tube using 2 ml of standard sulphide solution in place of the material for analytical reagent grade.

D-4.1 The limit prescribed in Table 1 shall be taken as not having been exceeded if the intensity of colour produced with the material is not greater than that in the control test.

IS 14781 : 2000

ANNEX E

[Table 1, Sl No. (v)]

TESTFOR HEAVY METALS

E-l APPARATUS

E-l.1 Nessler Tubes

50 ml capacity.

E-2 REAGENTS ,

E-2.1 Dilute Ammonium Hydroxide .

Approximately 5 N.

E-2.2 Hydrogen Peroxide

Approximately 15 percent by mass.

E-2.3 Dilute Hydrochloric Acid

Approximately 5 N and 1:99 (v/v).

E-2.4 p-Nitrophenol Indicator

Dissolve 0.2 g ofp-nitrophenol in hot water and dilute

with water to 100 ml.

E-2.5 Standard Lead Sol&ion

Dissolve 1.60 g of lead nitrate [Pb(NO,),] in water, add I ml of concentrated nitric acid and make up the volume to 1 000 ml. When required for use, pipette out 10 ml of this solution and dilute to 1 000 ml. When required for use, pipette out 10 ml of this solution and dilute to 1 000 ml with water.One millilitre of this solution contains 0.0 I mg of lead (as Pb).

E-2.6 Hydrogen Sulphide Water

Freshly prepared, saturated, aqueous solution of

hydrogen sulphide.

E-3 PROCEDURE

Dissolve 0.200 g of the material of technical grade

and 5.0 g of the material of other grades, in 20 ml of

water. Add 5 ml of dilute ammonium hydroxide and

then add slowly, in several portions, 40 ml of hydrogen

peroxide. Allow to stand for 10 min. Evaporate to

dryness on a steam-bath. Add 5 ml of dilute

hydrochloric acid ( 5 N) and 10 ml of water. Heat to

boiling. Dilute to 100 ml with water. Transfer 20 ml

of the solution in a Nessler tube and neutralize with

dilute ammonium hydroxide using p-nitrophenol as

indicator. Add dilute hydrochloric acid (1 : 99)

dropwise until neutral to the indicator and then 1 ml

of acid in excess. Carry out a control test, following

the same procedure, in another Nessler tube using the

following volumes of stand&d lead solution in place

of the material :

a) 2 ml for technical grade,

b) 2.5 ml for pure grade, and

c) 1 ml for analytical reagent grade.

Add 10 ml of hydrogen sulphide water to each Nessler

tube, dilute to the mark and shake the contents well.

Compare the colour produced in the two tubes.

E-3.1 The limit prescribed in Table 1 shall be taken

as not having been exceeded if the intensity of colour

produced in the test with the material is not greater

than that produced in the control test.

ANNEX F

[Table 1, SZ No. (vi)]

TEST FOR IRON

F-l OUTLINE OF THE METHOD

Ferric iron gives a red colour with potassium thiocyanate. The colour produced by the material after oxidation is compared with the colour formed by a standard iron solution.

F-2 APPARATUS

F-2.1 Nessler Tubes

50 ml capacity.

F-3 REAGENTS

F-3.1 Concentrated Hydrochloric Acid

Conforming to IS 265.

F-3.2 Ammonium Persulphate or Potassium Persulphate

F-3.3 Butanolic Potassium Thiocyanate Solution

Dissolve 10 g of potassium thiocyanate in 10 ml of

water. Add sufficient n-butanol to make up to 100 ml

5

1s 14783 : 2000

and shake vigorously unti! the solution is clear.

F-3.4 Standard lrorr Solution

Dissolve 0.702 g of ferrous ammonium sulphate [F&O, (NH,)~S0,.6H,O ] in 10 ml ofdilute sulphuric acid (IO percent v/v) and dilute with water to 1 000 ml. Pipette out 10 mf of the solution and dilute

with water to make up the volume to 100 ml. One

mil!ilitre of this solution contains 0.01 mg of iron (as Fe).

F-4 PROCEDURE

Pipette out 20 ml uf the solution prepared in E-3 to a

Nessler tube. Add 1 ml of concentrated hydrochloric acid, 30 mg of ammonium persulphate or potassium persulphate and 15 ml of butanolic potassium thiocyanate solution. Carry out a control test using 0.5 ml of standard iron solution for the analytical

reagent grade, in place of the material. Shake the solution in the tube vigorously for 30 s and allow the liquid to separate.

F-4.1 The limit prescribed in Table 1 shall be taken as not having been exceeded if the intensity of any red colour produced in the butanolic layer of the first Nessler tube is not greater than that produced in the control test.

ANNEX G

[Table 1, Sl No. (vii)]

TEST FOR DETERMINATION OF CALCIUK

G-I OUTLINE OF THE METHOD

The formation of calcium oxalate, which appears as a turbidity, is taken as the test for calcium.

G-2 FOR PURE-GRADE

G-2.1 Reagents

G-2.1.1 Amtnonium O.w/ate Solution

2.5 percent.

G-2.2 Procedure

Dissolve 0.25 g of the material in 5 ml of water. Add to it 5 ml of ammonium oxalate solution and allow to stand for 5 min.

G-2.3 The material shall be taken to have passed the test if no turbidity is produced.

G-3 FOR ANALYTICAL REAGENT GRADE

G-3.1 Reagents

G-3.1.1 Dilute Ammonium Hy\dvoxide

Approximately 5 N.

G-3.1.2 Ammoniutn Oxalate Solution

2.5 percent.

G-3.2 Procedure

Dissolve 2.0 g of the material in 20 ml of water. Add 2 ml of dilute ammonium hydroxide and 2 ml of ammonium oxalate solution. Shake and set aside for

10 min.

G-3.3 The limit prescribed in Table 1 shall be taken as not having been exceeded if no turbidity is produced.

6

IS 14781 : 2000

ANNEX H

[Table 1, SI No. (viii)]

TEST FOR SULPHATE AND SULPHITE

H-l OUTLINE OF THE METHOD

Sulphite is oxidized to sulphate by iodine. The formation of barium sulphate which appears as a turbidity is taken as the test for sulphate and sulphite.

H-2 APPARATUS

H-2.1 Nessler Tubes

50 ml capacity.

H-3 REAGENTS

H-3.1 Iodine Solution

Approximately 0.1 N

H-3.2 Barium Chloride Solution

Approximately 10 percent.

H-4 PROCEDURE

Weigh 1.000 g of the material into a Nessler tube.

Dissolve in water and add iodine solution till the

solution becomes faint yellow. Add 1 ml of barium

chloride solution.

H-4.1 The limit prescribed in Table I shall be taken

as hot having been exceeded if no opalescence or

turbidity is produced in the test.

ANNEX J

[Table 1, Sl No. (ix)]

TEST FOR ARSENIC

J-l OUTLINE OF THE METHOD

The stain produced by arsenic on a mercuric bromide

paper is compared with the stain produced by standard

arsenic solution.

J-2 REAGENT

J-2.1 Concentrated Sulphuric Acid

Conforming to IS 266.

J-3 PROCEDURE

J-3.1 Preparation of Solution

Dissolve i.000 g of the material in 50 ml of water. Add 5 ml of concentrated sulphuric acid and evaporate

to about 15 ml.

J-3.2 Carry out the test for arsenic as prescribed in 1s 2088 using for comparison a stain prepared by using

0.0 1 mg of arsenic trioxide (As,O,).

ANNEX K

(Clause 6)

SAMPLING AND CRITERIA FOR CONFORMITY

K-l GENERAL REQUIREMENTS OF SAMPLING

K-l.1 In drawing, preparing, storing and handling test samples, the following precautions and directions

shall be observed.

K-l.2 Samples shall not be taken at a place exposed

to weather.

K-l.3 Precautions shall be taken to protect the

samples, the material being sampled, the sampling

instrument and the containers for samples from adventitious contamination.

K-l.4 To draw a representative sample, the contents of each container selected for sampling shall be mixed thoroughly by suitable means.

K-1.5 The samples shall be placed in suitable, clean, dry and air-tight opaque glass containers.

K-l.6 The sample containers shall be of such a size

IS 14781 : 2000

that they are almost completely filled by the sample.

K-l.7 Each sample container shall be sealed air-tight after filling and marked with full details of sampling, the date of sampling and the year of manufacture of

the material.

K-l.8 Samples shall be stored in such a manner that the temperature of the material does not vary unduly from the normal temperature.

K-2 SCALE OF SAMPLING

K-2.1 Lot

All the containers in a single consignment of the material drawn from a single batch of manufacture shall constitute a lot. If a consignment is declared to consist of different batches of manufacture, the batches shall be marked separately and the group of containers in each batch shall constitute separate lots.

K-2.2 From each lot five containers shall be selected (see K-2.2.1) for drawing samples for test. In~case the lot contains less than five containers, each container shall be tested.

K-2.2.1 Arrange the containers in a lot in a systematic way and starting from any container, count them as 1, 2, 3 ,..... up to r and so on. Every rth container thus counted shall be separated for drawing samples for

test, where

Number of containers in the lot Y=

5

NOTE -- In case the value of r comes out to be a fractional number it shall be taken as equal to the integral part of that value.

K-3 TEST SAMPLES

K-3.1 Drawing of Samples

Draw a representative sample from each container

-selected.

K-3.1.1 Mix portions of the material drawn from the same container to prepare the test sample representing the container. The quantity of material to be drawn from each container shall be sufficient to conduct all the tests given in K-4 shall not be less than 200 g.

K-3.1.2 The samples shall be stored in dry opaque glass bottles or other suitable containers, sealed air- tight and labelted with all the particulars of sampling

given in K-1.7.

K-3.1.3 Five test samples representing the five containers selected shall constitute a set of test samples.

K-4 NUMBER OF TESTS

K-4.1 For Technical Grade

Tests for thf: determination of sodium thiosulphate content shall be conducted on each of the five test samples (see K-3.1.3). Tests for all other

characteristics prescribed in 3 shall be conducted on a composite test sample, prepared by mixing equal quantities of material from each of the five test samples.

K-4.2 For Pure Grade

Tests for the determination of sodium thiosulphate, heavy metals and arsenic shall be conducted on each of the five test samples (see K-3.1.3). Tests for all other characteristics prescribed in 3 shall be conducted on the composite sample (see K-4.1).

K-4.3 For Analytical Reagent Grade

Tests for the determination of sodium thiosulphate and sulphate and sulphite shall be conducted on each of the five test samples (see K-3.1.3). Tests for all other characteristics prescribed in 3 shall be conducted on the composite sample (see K-4.1).

K-5 CRITERIA FOR CONFORMITY

K-5.1 For Test Carried Out on Five Test Samples

K-5.1.1 Sodium Thiosulphate

From the test results for sodium thiosulphate, the mean

(x ) and (R) of test results shall be calculated (range

being defined as the difference between the maximum and the minimum values of test results). The lot shall be considered to have passed if the values of the

expression (x f 0.86 R) are within the limits for the

relevant grades prescribed in Table 1.

K-5.1.2 Heavy Metals, Iron, Sulphate and Sulphite and Arsenic

The lot shall be considered to have passed for the characteristics tested (see K-4.1 to -K-4.3) if each test sample passes the corresponding test prescribed.

K-5.2 TEST CARRIED OUT ON COMPOSITE TEST SAMPLE

The lot shall be considered to have passed in respect of the characteristics tested on the composite te~st sample (see K-4.1 to K-4.3) if the composite test sample satisfies the corresponding tests prescribed.

K-5.3 The lot shall be considered as conforming to the specification if it satisfies all the~criteria given in K-5.1 and K-5.2.

8

IS 14781:2000

ANNEX L

(FOtVWOd)

COMMITTEE COMPOSITION

General Inorganic Chemicals Sectional Comniittee,CHD 3

Chairman

DR A. N. BHAT

Members

DR A. PRAMANIK (Aternare to Dr A. N. Bhat)

SHIU R. M. CURSETJI

SHRI S. P. GANDHE (Ahernate)

SHRI R. C. SETHI

SHRI N. RAW BHUSHAN (Alrernafe)

DR S. K. ROY

SHRI P. KUNDU (Alrernare)

DR J. S. REKHI SHRI R. C. SHARMA

SHRI A. K. CHATT~RII (Alfemale) SHRI P. JAYAKUMARAN

SHRI N. K. KAUSHAL (Allernafe)

SHRI A. K. DASGWTA

SHRI B. S. MEHTA (Alternate) SHR~ K. A. ABDULKHADIR

DR K. N. MATHUR

DR. SUBHASH CHANDRA (Alternate)

DR P. G. PRADHAN

SHRI P. I. BHAGAT (Alrernale)

SHIU R. S. VYAS

SHRI H. VAMAN RAO (Alfernate)

DR P. C. GWTA

SHRI SURENDER KUMAR (Alternate)

REPRESENTATIVE

SHRI G. M. RAO

SHRI S. R. BHAISARE (Akrnare)

SHRI A. K. DAS

SHRI R. BHA~ACHARJEE (Alternafe)

SHIU R. P. KHANNA

DR. A. K. SARANGI (Alfernate)

DR S. K.XAPOOR

DR. R. K. SETHI (Akernaw)

DR S. H. IQBAL

DR C. GOPINATHAN (Alternate)

DR B. B.PAL

SHIU A. K. CHAKRAVARTY (Alternate)

SHRI S. C. GULATI

DR (SMT) LAXMI KANTHAM

DR R. M. BHATNAGAR

SHIU P. R. DESAI

DR A. N. SONY (Alfernate)

SHRI P. K. KAICKER

SMT LAXMI RAWAT (Altemafe)

DR T. C. PAT~L

SHRI R. P. PATHAK (Alternate)

SHRI C. R. SANTHANAKRISHNAN

SHRI G. ETHIRAJ (Alternate)

Representing

Hindustan Lever Ltd, Mumbai

The Associated Cement Companies Ltd, Mumbai

Bharat Electronics Ltd, Bangalore

Central Glass and Ceramics Research Institute, Calcutta

Development Commissioner, Small Scale Industries, New Delhi Department of Industrial Policy and Promotion, Ministry of Industry, New Delhi

Directorate General of Supplies and DisposaLNew Delhi

Deepak Nitrite Ltd, Vadodam

Federation of Associations of Small Industries of India, New Delhi Geological Survey of India, Calcutta

Golden Chemicals Ltd, Mumbai

The Dharamsi Moratji Chemical Co Ltd, Ambemath

Indian Chemicals Manufacturers’ Association, Calcutta

Indian Oil Corporation Ltd (Refineries and Pipelines Division), New Delhi Indian Bureau of Mines, Nagpur

BOC India Ltd, Calcutta

Ministry ofDefence (DGQA)

Ministry of Defence (R & D)

National Chemical Laboratory, Pune

National Test House, Calcutta

Oil and Natural Gas Commission, Debra Dun Indian Institute ofchemical Technology, Hyderabad Projects and Development India Ltd, Sindri Sarabhai MChemicals, Vadodara

Shrimm Institute for Industrial Research, Delhi

Tata Chemicals Ltd, Mumbai

T.C.M. Ltd, Metturdam

(Continued on page 10)

9

IS14781:2000

(Continued from page 9)

Members

DR R. V. JASRA

DR P. M. OZA (Alternafe) SHRl v. B. %3Nl

SHRI A. K. CHAKRAWARTY (Alternate) SHRI LAJINDER SINGH,

Director(Chem)

Convener

SHRI V. B. SONI

SHRI A. K. CHAKRAVAR~V (Alternate) SHRI B. H. PATEL

SHRI H. R. SHAH @/tern&e)

DR J. S. REKHI

SHRI R. K. CH~PRA

DR (SMT) RENU GUPTA (Alternate) SHRI S. S.~NGHANIA

SHRI B. L. KANODIA (Alternafe) DR P. G. PRADHAN

SHRI P. I. BHAGAT (Alternate) DR H. C. SHAH

SMT~K. H. SHAH (Ahernate)

DR R. M. BHATNAGAR

SHRI B. MUKHERJEE (Alternate) SHRI S. BALASUBRAMANIAN

SHRI K. SUBRAMANIAN (Alternate) SHRI D. B. RAM MOHAN

SHRI S. ANANTHAQAMAN (Alternate) SHK~ S. K. BARAT

SHRI S. BANEUJEE (Alternate)

CentralSalt and Marine Chemicals Research Institute, Bhavnagar

Union Carbide of India Ltd, Mumbai

Directorate General, BIS (fi-oflccio Member)

Secretary

MS CHITRA GUPTA

Deputy Director (Chem), BIS

Auxiliary Chemicals Subcommittee, CHD 3: 4

Electrolytic Manganese Company, India Ltd, Thane

Union Carbide of India Ltd, Mumbai

Deepak Nitrite Ltd, Vadodara

Development Commissioner, Small Scale Industries, New Delhi

Geological Survey of India, Calcutta

Indian Council of Small Scale Industries, Calcutta

Golden Chemicals Pvt Ltd. Mumbai

3 K Chemicals Company, Thane

Projects and Development india Ltd. Sindri

Tamii Nadu Chemical Products Ltd, Chennai

The Travancore-Cochin Chemicals Ltd, Udyogamandal

Waldies Limited, Calcutta

10,

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Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country.

Copyright

“:

BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as.symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review of Indian Standards 4 ;.. t ,+

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

This Indian Standard has been developed from Dot : No. CHD 3 (593).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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