ISO 21438-2:2009 工作场所空气 用离子色谱法测定无机酸 第2部分：除氢氟酸外的挥发性酸（盐酸、氢溴酸和硝酸）
标准编号：ISO 21438-2:2009
中文名称：工作场所空气 用离子色谱法测定无机酸 第2部分：除氢氟酸外的挥发性酸（盐酸、氢溴酸和硝酸）
英文名称：Workplace atmospheres — Determination of inorganic acids by ion chromatography — Part 2: Volatile acids, except hydrofluoric acid (hydrochloric acid, hydrobromic acid and nitric acid)
发布日期：2009-12
标准范围
ISO 21438-2:20 09规定了一种测定工作场所空气中氯化氢（HCl）气体和盐酸雾、溴化氢（HBr）蒸汽和氢溴酸雾以及硝酸（HNO3）蒸汽和雾的时间加权平均质量浓度的方法，该方法通过在碱浸渍石英纤维过滤器上收集并通过离子色谱法进行分析。对于雾采样，该方法适用于空气中可吸入部分的个人采样和静态（区域）采样。该分析方法适用于每个样品0.01 mg至2.5 mg HCl、HBr和HNO3的测定。测量程序适用的空气中HCl、HBr和HNO3的浓度范围由用户选择的采样方法确定。对于240升空气样本，HCl、HBr和HNO3的工作范围约为0.04 mg/m3至10 mg/m3。该方法旨在区分酸及其相应的盐。如果两者都存在于空气中，颗粒盐会被截留在预过滤器上。如果需要，可以分析捕获在预过滤器上和/或沉积在采样器壁上的共采样的颗粒物质。酸可与预过滤器上的共采样颗粒物发生反应，从而干扰酸浓度的测量。
ISO 21438-2:2009 specifies a method for the determination of the time-weighted average mass concentration of hydrogen chloride (HCl) gas and hydrochloric acid mist, hydrogen bromide (HBr) vapour and hydrobromic acid mist and nitric acid (HNO3) vapour and mist in workplace air by collection on an alkali-impregnated quartz fibre filter and analysis by ion chromatography.For mist sampling, the method is applicable to the personal sampling of the inhalable fraction of airborne particles and to static (area) sampling.The analytical method is applicable to the determination of masses of 0,01 mg to 2,5 mg of HCl, HBr and HNO3 per sample.The range of concentrations of HCl, HBr and HNO3 in air for which the measuring procedure is applicable is determined by the sampling method selected by the user. For a 240-litre air sample, the working range is approximately 0,04 mg/m3 to 10 mg/m3 for HCl, HBr and HNO3.The procedure is intended to differentiate between the acids and their corresponding salts. If both are present in the air, particulate salts are trapped on a pre-filter. Co-sampled particulate matter trapped on the pre-filter and/or deposited on the walls of the sampler may be analysed, if desired.Acids can react with co-sampled particulate matter on the pre-filter, causing interference with the measurement of the acid concentration.
标准预览图
