ISO 11480:2017 パルプ、紙、板紙—総塩素と有機結合塩素の測定 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 6, Paper, board and pulps.

This second edition cancels and replaces the first edition (ISO 11480:1997), which has been technically revised to include the option of using the Schöniger combustion method combined with ion chromatography.

Introduction

This document specifies two procedures for the determination of total and organically bound chlorine in pulp, paper and board. The microcoulometric method (Clause 4) is based on combustion in a heated tube followed by microcoulometric titration. The Schöniger method (Clause 5) is based on the so-called Schöniger combustion followed by ion chromatography.

The choice of procedure depends on the availability of the apparatus and on the risk of interference by bromine compounds in the sample. In the microcoulometric method, the result does not strictly represent the chlorine content since it includes part of any bromine present in the sample. This procedure should thus be avoided if there is a risk that the sample has a high bromine content.

More work is involved in the Schöniger method than in the microcoulometric method. However, since the end determination is performed by ion chromatography, the result is unambiguously chlorine. The Schöniger method also requires a larger sample. Consequently, the result is more representative. On the other hand, the microcoulometric method is faster and several replicate determinations can be performed in a short time.

1 Scope

This document specifies two alternative procedures for the determination of total and organically bound chlorine in pulp, paper and board. It is applicable to all types of pulp, paper and board. The lower limit of the determination is about 20 mg/kg.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

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Bibliography