Sorption behavior of selenium on humic acid under increasing selenium concentration or increasing solid/liquid ratio

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• 作者：Nao Kamei-Ishikawa ; Yasuo Nakamaru ; Keiko Tagami ; Shigeo Uchida
• 关键词：Selenium ; Humic acid ; Sorption ; Organic matter ; Freundlich isotherm ; Ultrafiltration
• 刊名：Journal of Environmental Radioactivity
• 出版年：2008
• 期刊代码：45_0265931x
• 类别：env
• 出版时间：June 2008
• 卷：99
• 期：6
• 页码：993-1002
• 文件大小：204 K

摘要

The sorption of selenium (Se) on humic acid (HA) was investigated in order to better understand the fate of stable and radioactive Se in soils and sediments. An ultrafiltration technique was used to determine size distributions of HA-sorbed-Se when increasing Se concentration and solid/liquid ratio. The results showed that the Se sorption onto HA followed the Freundlich isotherm. No solid/liquid ratio-dependence was observed especially when <3 kDa molecular size fraction was used from solid/liquid separation. The Freundlich isotherm parameters K_F and n obtained using the <3 kDa molecular size fraction for solid/liquid separation were 3.7 × 10² and 0.82, respectively. In addition, since dissolved HA increased with decreased ionic strength in the HA suspension, ionic strength could promote aggregation of HA. The conformational change of HA could affect the sorption behavior of Se on HA.