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《Journal of Southwest University(Natural Science Edition)》 2009-07
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Determination of Soil Water-Soluble Selenium by Fe~(3+) Concentration Fixation and Mixed Acid Digestion

TONG Jian-chuan,WANG Chun-miao,SHI Zhong-shan,YANG Jian-hongCollege of Resources and Environmental Sciences,Southwest University,Chongqing 400716,China  
As soil water extract contains much water-soluble organic selenium and organic matter,the determination of soil water-soluble selenium should be concentrated and digested beforehand.Water extracts from the soil was concentrated in boiling bath under the presence of nitric acid and with added Fe3+ as fixative,and then digested with mixed acid before selenium content was determined by a hydride atomic fluorescence spectrometer.The results showed that the determination values were raised by 40% or more than those of the untreated soil,the recoveries were between 98 ~ 102%,and the variation coefficient was ≤0.3%.In the process of enrichment and digestion,suitable use of nitric acid and sulfuric acid to ensure the accuracy according to the dissolved organic matter content is of great significance.
【Fund】: 国家科技计划资助项目;; 沿三峡水库农业面源污染防控与综合治理技术研究(2007BAD87B10)
【CateGory Index】: X833
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