IS 1060 : Part 4 : Sec 10 : 2024/ISO 11480 : 2017 Methods of Sampling and Test for Paper and Allied Products - Part 4 Methods of Test for Paper, Board and Pulp - Section 10 Determination of Total Chlorine and Organically Bound Chlorine

ICS 85.040; 85.060

CHD 15

NATIONAL FOREWORD

This Indian Standard (Part 4/Sec 10) (First Revision) which is identical to ISO 11480 : 2017 'Pulp, paper and board - Determination of total chlorine and organically bound chlorine' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Paper and its Products Sectional Committee and approval of the Chemical Division Council.

Use of elemental chlorine in pulp bleaching leads to some toxic substance such as dioxins, furans and organic halides. It is therefore essential to monitor the use of chlorine in the industrial processes. Total and organically bound chlorine in pulp, paper and board can be determined through two procedures; microcoulometric method which is based on combustion in a heated tube followed by microcoulometric titration and the Schöniger method which is based on the Schöniger combustion followed by ion chromatography.

ISO has published test method standards related to paper, pulp and board under three broad categories namely 'Paper, board and pulps', 'Paper and board' and 'Pulps'. Related Indian Standards published in IS 1060 (Parts 1, 2 and 3) 'Methods of sampling and test for paper and allied products' and IS 6213 series of standards published for 'Methods of test for pulps' are widely recognized and used in India. To maintain consistency with the prevailing international practices and to retain the existing test methods series, the committee responsible for formulating this standard decided to harmonize the methods of tests prescribed in IS 1060 series and IS 6213 series with those published by ISO and publish these adopted test methods standards in subsequent parts/sections of IS 1060 series or IS 6213 series.

Other parts of IS 1060 series on 'Methods of sampling and test for paper and allied products' in which related Indian standards have been published are:

Part 4 Methods of test for paper, board and pulp

Part 5 Methods of test for paper and board

Part 6 Methods of test for paper

Part 7 Methods of test for board

This Section of IS 1060 (Part 4) specifies two alternative procedures for the determination of total and organically bound chlorine in all types of pulp, paper and board. The lower limit of the determination is about 20 mg/kg. The other sections of IS 1060 (Part 4) are:

Sec 1 Standard atmosphere for conditioning and testing and procedure for monitoring the atmosphere and conditioning of samples

Sec 2 Determination of residue (ash) on ignition at 525 °C

Sec 3 Determination of residue (ash) on ignition at 900 °C

Sec 4 Measurement of diffuse radiance factor

Sec 7 Determination of pH of aqueous extracts - Hot extraction method

Sec 8 Determination of water-soluble chlorides

Sec 9 Determination of water-soluble sulfates

Sec 11 Determination of acid soluble magnesium, calcium, manganese, iron, copper, sodium and potassium

Sec 12 Determination of cadmium content - Atomic absorption spectrometric method

Sec 13 Measurement of diffuse blue reflectance factor - Indoor daylight conditions (ISO brightness) (first revision)

This standard was first published in 2014 by identical adoption of ISO 11480 : 1997 'Pulp, paper and board - Determination of total chlorine and organically bound chlorine' under dual numbering. ISO 11480 : 1997 has been revised into ISO 11480 : 2017. The first revision has been undertaken in order to adopt the latest version of ISO 11480.

In this revision, option of using the Schöniger combustion method combined with ion chromatography has been included.

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.