scope:

This International Standard describes the method for the sampling and determination of selenium compounds in both vapour phase and ash particles that are entrained in combustion flue gases carried in stacks or ducts. The selenium content in flue gas is expressed as a mass of elemental selenium in the stack gas. Gaseous and particulate selenium compounds are captured by an absorber solution and a filter, 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 are also permitted such as HG-AAS, HG-atomic fluorescence spectrometry (AFS), HG-ICP-OES and HG-ICP-MS. The detection limit for gaseous selenium compounds will be 0,3 µg/m3 by using HG-ICP-MS at a sampling volume of 0,12 m3. The detection limit for particulate selenium compounds will be 0,0012 µg/m3 by that method at a sampling volume of 2,0 m3.