Collaborative Study Into The Analysis Of Total Selenium And Selenium Valence States In Glass - A General Method By Hydride Generation Atomic Absorption Spectrometry And Photometry

Whilst the determination of total selenium in glass is of great relevance to environmental purposes, the measurement of the oxidation states of selenium which may arise under different redox conditions may contribute to clarify the mechanisms of colour formation. In the proposed method, the determination of total selenium is carried out by hydride generation atomic absorption spectrometry (HGAAS) on three different glasses covering the range of selenium content between 10 and 130 mg/kg of glass. To prevent losses during the decomposition step, selenium is converted into a nonvolatile form as selenate (Se6+). When the sample is decomposed, the HCl solution is made and selenium is pre-reduced to Se4+ by heating for 2h at 80 deg C.