Selenium speciation in flue desulfurization residues  

作　　者：Liping Zhong Yan Cao Wenying Li Kechang Xie Wei-Ping Pan 

机构地区：[1]Institute for Combustion Science and Environmental Technology (ICSET), Western Kentucky University, 2413 Nashville Rd. Bowling Green, Kentucky 42101, USA [2]Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China

出　　处：《Journal of Environmental Sciences》2011年第1期171-176,共6页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.90410018);the Shanxi Nature Science Foundation (No.20051017);the Shanxi Returned Scholar Research Project (No.2005-21);the Programfor Changjiang Scholars and Innovative Research Team at University in MOE,China (No.IRT0517)

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 μg/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.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 μg/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.

关 键 词：SELENIUM SPECIATION flue gas desulfurization hydride generation atomic fluorescence spectrometry 

分 类 号：X820.3[环境科学与工程—环境工程] TQ177.373[化学工程—硅酸盐工业]