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《Earth and Environment》 2009-04
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The Discussion of Several Issues on Selenium Sequential Chemical Extraction for Environmental Samples

LI Lu1,2,QIN Hai-bo1,2,SU Hui3,ZHU Jian-ming1,LING Hong-wen1,YANG Xiu-qun1(1.State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China;2.Graduate School of Chinese Academy of Sciences,Beijing 100039,China;3.Center for Disease Control and Prevention of Enshi Prefecture,Enshi 445000,China)  
The bioavailability,toxicity,mobility and biological effect of selenium are more controlled by chemical speciation than total selenium in the environment.Sequential chemical extraction technology is one of the practical tools for selenium speciation analysis.Base soluble,elemental,sulfide/selenide selenium are stressly discussed based on seven-steps sequential chemical extraction protocol.The influence of solution/solid ratio and extracted reagents on extraction is studied,and other fractionations are also discussed.The results showed that appropriate solution/solid ratios range from 20 to 50 in extraction procedure.0.1~0.5M NaOH can effectively extract base solution selenium under heated water bath.1M Na2SO3 is a better reagent for elemental selenium extraction.600~700mL/min airflow flux ensures that H2Se reducted by sulfide/selenide selenium is fully sorbed.
【Fund】: 国家自然科学基金创新群体项目(40721002);; 基金项目资助(40973085);; 贵州省科学技术基金(黔科合J字[2008]2228);; 中科院地化所矿床地球化学国家重点实验室开放项目资助(200912)
【CateGory Index】: TN304.13
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