Adsorption/Desorption and Fate of Mercury (II) by Typical Black Soil and Red Soil in China
Adsorption/Desorption and Fate of Mercury (II) by Typical Black Soil and Red Soil in China
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DOI：
10.1080/15320383.2010.499925
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发表时间：
2010-08
期刊：
影响因子：
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通讯作者：
Jia Liu;J. Dai;Ren-qing Wang;Fasheng Li;Xiaoming Du;Wen-xing Wang
中科院分区：
文献类型：
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作者：
Jia Liu;J. Dai;Ren-qing Wang;Fasheng Li;Xiaoming Du;Wen-xing Wang
东北老工业区工业的快速发展导致了汞污染。通过对该地区典型黑土和中国南方典型红壤中汞（II）的吸附/解吸和转移进行了一系列的批量试验，并进行了比较。结果表明，两种土壤对Hg （II）均具有较高的亲和力，吸收量均大于添加量的95%。Hg （II）吸附等温线符合Langmuir和Freundlich方程。Hg （II）对黑土的亲和力是红土的3倍。结果表明，土壤有机质对Hg （II）的吸附具有重要作用。有机质对Hg （II）的最大吸收量分别占黑土和红土最大吸收量的53%和28%。动力学研究表明，两种土壤对汞的吸附均呈现先快后慢的双相模式。黑土在34 min内完成90%的Hg （II）吸附，在321 min内达到平衡，而红壤的吸附时间分别为91 min和630 min。
Rapid industrial development in the old northeastern industrial region of China resulted in Hg pollution. A series of batch experiments were conducted to assess the adsorption/ desorption and transfer of Hg (II) within typical black soil in this region and typical red soil in south China as a comparison: both are typical soils in China. It was found that both soils had high affinity for Hg (II) and the absorbed amount was more than 95% of the added. Hg (II) adsorption isotherms were well fitted with the Langmuir and Freundlich equations. The affinity of Hg (II) for black soil was three times higher than that of red soil. Results demonstrated that soil organic matter had an important role in Hg (II) adsorption. Fifty-three and twenty-eight percent of the maximum sorption amount for Hg (II) was contributed by organic matter for black soil and red soil, respectively. Kinetic studies showed that Hg adsorption on both soils was characterized by a biphasic pattern, with a fast step followed by a slow step. Black soil completed 90% of total Hg (II) adsorption in 34 min and reached equilibrium in 321 min, compared to 91 min and 630 min on red soil, respectively.