ISO 6323-1:2024 職場の空気 — 電熱原子吸光分析法によるヒ素およびヒ素化合物の測定 — Part 1:ET-AAS によるヒ素およびヒ素化合物 (アルシンを除く) | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 146, Air quality, Subcommittee SC 2, Workplace atmospheres.

A list of all parts in the ISO 6323 series can be found on the ISO website.

Introduction

Arsenic and arsenic compounds are toxic and are recognized as human carcinogens. In particular arsenic and arsenic compounds are a hazard to the health of workers in many industries through exposure by inhalation. Industrial hygienists and other public health professionals need to determine the effectiveness of measures taken to control workers’ exposure. The collection of samples of air during a work activity and then measuring the amount of particular arsenic and arsenic compounds are often done to assess an individual’s exposure, the effectiveness of workplace controls or respiratory protection measures. The air sampling can be done as stationary or personal air sampling. Electrothermal atomic absorption spectrometry (ET-AAS) analysis of particular arsenic and arsenic compounds in a sample of respirable or inhalable dust collected on a collection substrate (membrane filter) is employed in many countries to measure and estimate exposure to arsenic and arsenic compounds. ET-AAS is able to quantify arsenic and arsenic compounds.

1 Scope

This document specifies a method for the determination of the mass concentration of particulate arsenic and arsenic compounds in workplace air sampled on a filter (e. g. 37 mm cellulose nitrate filter), digested with acid or an acid mixture and analysed quantitively by using electrothermal atomic absorption spectrometry (ET-AAS). The method is not suitable for determination of arsenic in the form of metal arsenides, which decompose in the presence of water or acid, or for arsenic trioxide vapour.

Many different types of sampling apparatus are used to collect respirable or inhalable dust, according to the occupational hygiene convention. This document is designed to accommodate the variety of samplers and collection substrates available to analysts. This document is intended to be used in conjunction with ISO 21832 which promotes best practices for these analyses.

The method is applicable to the determination of masses of approximately 0,2 µg to 2 μg of arsenic per sample, for analysis of test solutions prepared using sample solution aliquots in the recommended range (see 10.1.3 and 10.1.4.1). The concentration range for arsenic in air, for which this procedure is applicable, is determined in part by the sampling procedure selected by the user.

The method is applicable to personal and stationary air sampling.

A number of transition metals can interfere with the determination of arsenic by electrothermal atomic absorption spectrometry (see 11.3).

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 terms and definitions given in ISO 18158 apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

Bibliography