Selenium speciation in flue desulfurization residues

被引:26
|
作者
Zhong, Liping [1 ,2 ]
Cao, Yan [1 ]
Li, Wenying [2 ]
Xie, Kechang [2 ]
Pan, Wei-Ping [1 ]
机构
[1] Western Kentucky Univ, ICSET, Bowling Green, KY 42101 USA
[2] Taiyuan Univ Technol, Minist Educ & Shanxi Prov, Key Lab Coal Sci & Technol, Taiyuan 030024, Peoples R China
基金
中国国家自然科学基金;
关键词
selenium; speciation; flue gas desulfurization; hydride generation; atomic fluorescence spectrometry; COAL COMBUSTION; DIMETHYLARSINIC ACID; GAS DESULFURIZATION; HYDRIDE GENERATION; FLY-ASH; SE; HG; SPECTROSCOPY; SPECTROMETRY; MERCURY;
D O I
10.1016/S1001-0742(10)60390-7
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 mu 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.
引用
收藏
页码:171 / 176
页数:6
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