IS 582 : Part 5 : Sec 1 : 2024/ISO 17234-1 : 2020 Methods of Chemical Testing of Leather - Part 5 Determination of Certain Azo Colorants in Dyed Leathers - Section 1 Determination of Certain Aromatic Amines Derived from Azo Colorants

ICS 59.140.30

CHD 17

NATIONAL FOREWORD

This Indian Standard (First Revision) (Part 5/Sec 1) which is identical to ISO 17234 -1 : 2020 'Leather — Chemical tests for the determination of certain azo colorants in dyed leathers - Part 1: Determination of certain aromatic amines derived from azo colorants' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Leather, Tanning Materials and Allied Products Sectional Committee and approval of the Chemical Division Council.

The Indian Standard IS 582 : 1970 Methods of chemical testing of leather (first revision) prescribes the methods of chemical testing for all types of leathers. The Committee responsible for formulating this standard has decided to harmonize the methods of test prescribed in IS 582 with those prescribed in ISO/IULTCS standards. Accordingly, the committee decided to retain IS 582 and publish the harmonized/ adopted test methods published by ISO/IULTCS in various parts of IS 582 as this standard is widely recognized by the Indian Leather Industry

The committee had further decided to publish the adopted/harmonized standards in the following manner:

a) Wherever an existing test method is being replaced by the corresponding ISO/IULTCS test method, the relevant part will be published with the information in the National Foreword about the method of IS 582 being superseded; and

b) When a new test method is being incorporated in IS 582, the same will be published as a new standard and as a subsequent part/section of IS 582.

This Indian Standard was first published in 2018 as an identical adopting of ISO 17234-1 : 2015 under dual numbering. This section of part 5 specifies a method for determining the use of certain azo colorants which can release certain aromatic amines.

This Indian Standard is published in several parts.The other parts in this series are:

Part 1 Determination of volatile matter

Part 2 Determination of water-soluble matter, water soluble inorganic matter and water–soluble organic matter

Part 3 Determination of sulphated total ash and sulphated water-insoluble ash

Part 4 N-Methyl-2-Pyrrolidone NMP in Leather

Part 5 Determination of certain azo colorants in dyed leathers

Sec 2 Determination of 4-aminoazobenzene

Part 6 Determination of metal content

Sec 1 Extractable etals

Sec 2 Total metal content

Part 7 Quantitative analysis of tanning agents by filter method

Part 8 Determination of the preservative (TCMTB, PCMC, OPP, OIT) content in leather by liquid chromatography

Sec 1 Acetonitrile extraction method

Sec 2 Artificial perspiration extraction method

Part 9 Determination of pH and difference figure

Part 10 Determination of chromic oxide content

Sec 1 Quantification by titration

Sec 3 Quantification by atomic absorption spectrometry

Sec 4 Quantification by inductively coupled plasma (ICP)

Part 11 Determination of chromium (VI) content in leather

Sec 1 Colorimetric method

Sec 2 Chromatographic method

Part 12 Determination of nitrogen content and hide substance titrimetric method

Part 13 Determination of total silicon content reduced molybdosilicate spectrometric method

Part 14 Determination of matter soluble in dichloromethane and free fatty acid content

This first revision of the standard has been brought out to adopt the latest version of ISO 17234-1 : 2020. In this revision following modifications have been done:

a) A new Clause 3 added;

b) Changes to Clause 7 'Apparatus' and Clause 8 ' Reagents';

c) changes to Clause 9 and Clause 10 to improve the method;

d) Annex C Assessment guide - Interpretation of analytical results expanded to give examples of false-Positive results, suggested procedures and suggested comments in the test report; and

e) A new informative Annex D added.

The text of ISO standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are however not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words 'International Standard' appear referring to this standard, they should be read as 'Indian Standard'; and

b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.