Selenium speciation in flue desulfurization residues |
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Authors: | Liping Zhong Yan Cao Wenying Li Kechang Xie and Wei-Ping Pan |
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Institution: | 1. Institute for Combustion Science and Environmental Technology ICSET, Western Kentucky University, 2413 Nashville Rd Bowling Green,Kentucky 42101, USA;Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology,Taiyuan 030024, China 2. Institute for Combustion Science and Environmental Technology ICSET, Western Kentucky University, 2413 Nashville Rd Bowling Green,Kentucky 42101, USA 3. Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology,Taiyuan 030024, China |
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Abstract: | Flue gas from coal combustion contains significant amounts of volatile selenium (Se). The capture of Se in the flue gas desulfurization
(FGD) scrubber unit has resulted in a generation of metal-laden residues. It is important to determine Se speciation to understand the
environmental impact of its disposal. A simple method has been developed for selective inorganic Se(IV), Se(VI) and organic Se
determination in the liquid-phase FGD residues by hydride generation atomic fluorescence spectrometry (AFS). It has been determined
that Se(IV), Se(VI) and organic Se can be accurately determined with detection limits (DL) of 0.05, 0.06 and 0.06 g/L, respectively.
The accuracy of the proposed method was evaluated by analyzing the certified reference material, NIST CRM 1632c, and also by
analyzing spiked tap-water samples. Analysis indicates that the concentration of Se is high in FGD liquid residues and primarily exists
in a reduced state as selenite (Se(IV)). The toxicity of Se(IV) is the strongest of all Se species. Flue gas desulfurization residues pose a
serious environmental risk. |
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Keywords: | selenium speciation flue gas desulfurization hydride generation atomic fluorescence spectrometry |
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