固定源排放. 烟气中硒化合物的取样和测定

[中文适用范围]： 本国际标准描述了烟囱或管道中烟气中夹带的气相和固相硒化合物的采样和测定方法。 烟气中的硒含量以烟气中元素硒的质量浓度表示。 颗粒状和气态硒化合物分别被过滤器和吸收剂溶液捕获。 烟气中硒化合物的总浓度以两种浓度之和表示。 两个样品中的硒浓度均采用电感耦合等离子体发射光谱法 (ICP-OES)、电感耦合等离子体质谱法 (ICP-MS) 或石墨炉原子吸收光谱法 (GFAAS) 测定。 还可以使用与原子光谱法结合的氢化物发生 (HG) 技术，例如 HG-AAS、HG-AFS（原子荧光光谱法）、HG-ICP-OES 和 HG-ICP-MS。 使用 HG-ICP-MS 在 0.12 m3 采样体积下，气态硒化合物的检测限为 0.3 μg/m3。 使用该技术，采样体积为 2.0 m3，颗粒状硒化合物的检测限为 0.0012 μg/m3。 [外文原描述]： ISO 17211:2015 describes the method for the sampling and determination of selenium compounds in both vapour phase and solid phase that are entrained in flue gases carried in stacks or ducts. The selenium content in flue gas is expressed as a mass concentration of elemental selenium in the stack gas. Particulate and gaseous selenium compounds are captured by a filter and an absorber solution, respectively. The total concentration of selenium compounds in flue gas is expressed as the sum of both concentrations. The concentrations of selenium in both samples are determined using inductively coupled plasma optical emission spectrometry (ICP-OES), inductively coupled plasma mass spectrometry (ICP-MS) or graphite furnace atomic absorption spectrometry (GFAAS). Hydride generation (HG) techniques coupled to atomic spectrometry can also be used such as HG-AAS, HG-AFS (atomic fluorescence spectrometry), HG-ICP-OES and HG-ICP-MS. The detection limit for gaseous selenium compounds is 0,3 μg/m 3 using HG-ICP-MS at a sampling volume of 0,12 m 3 . The detection limit for particulate selenium compounds is 0,001 2 μg/m 3 using this technique at a sampling volume of 2,0 m 3 .