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Batch and in situ X-ray absorption spectroscopy (XAS) analysis were applied to the identification of selenium in aqueous solution containing selenite (Se(IV)O32-) and selenate (Se(VI)O42-) ranging from 10 to 1000mg-Se/L, respectively. Se K-edge XANES spectra were detected by means of a multi-channel silicon drift detector (SDD). Furthermore, the oxidation state of selenium was identified by measuring...
In a coal combustion process, a considerable amount of selenium is captured in the wet FGD, where it is oxidized from selenite (Se(IV)O32-) to selenate (Se(VI)O42-), which is difficult to remove. Diethyl-p-phenylene-diammonium (DPD) absorptiometric analysis and ion chromatography identified peroxodisulfate ion (S2O82-) as the dominant oxidizing agent in the FGD liquor. Selenite was easily oxidized...
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