工作场所空气 用电热原子吸收光谱法测定砷和砷化合物 第1部分：用电子吸收原子吸收光谱法测定砷和砷化合物（胂除外）

[中文适用范围]： 本文件规定了一种测定工作场所空气中颗粒砷和砷化合物质量浓度的方法，该空气取自过滤器（例如 37 毫米硝酸纤维素过滤器），用酸或酸混合物消化，然后使用电热原子吸收光谱法 (ET-AAS) 进行定量分析。该方法不适用于测定在水或酸存在下分解的金属砷化物形式的砷或三氧化二砷蒸气。根据职业卫生公约，使用多种不同类型的采样装置来收集可呼吸或可吸入的灰尘。本文件旨在适应分析人员可用的各种采样器和收集基质。本文件旨在与本文件结合使用。该方法适用于测定每个样品中大约 0.2 µg 至 2 μg 的砷，用于分析使用推荐范围内的样品溶液等分试样制备的测试溶液（参见 10.1.3 和 10.1.4.1）。本方法适用的空气中砷的浓度范围部分由用户选择的采样程序决定。该方法适用于个人和固定空气采样。许多过渡金属会干扰电热原子吸收光谱法测定砷（见 11.3）。 [外文原描述]： 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).