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城市污泥农用对不同土壤中有机污染物的影响

期刊名称：土壤.40(03).420-424,2008
时间：0
分类：S153[农业科学—土壤学;农业科学—农业基础科学]
作者机构：[1]国家海洋局第一海洋研究所,山东青岛266061, [2]中国科学院土壤环境与污染修复重点实验室,南京土壤研究所,江苏南京210008, [3]中国科学院海洋研究所,山东青岛266072, [4]中国科学院高能物理研究所同步辐射室,北京100039
相关基金：中国科学院创新工程方向项目（kzcx2-yw-404 No.CXTD-Z2005-4）; 国家自然科学基金项目（40432005）; 国家重点基础研究发展规划项目（2002CB4108010 2004CB720403）资助
相关项目：复合污染农田毒害污染物的生物转移过程和生态风险评估

关键词： PB, 内圈吸附, 沉淀, 外圈吸附, 碱性土壤, XAFS, Pb, Inner-sphere sorption, Precipitation, Outer-sphere sorption, Alkaline soil, XAFS

中文摘要：

采用批平衡法和X射线吸收精细结构光谱（XAFS）研究了碱性土壤吸附Pb的特性和机理。土壤对Pb的吸附过程表现出明显的非线性,符合Langmiur模型。XAFS分析表明土壤对Pb的吸附机制有三种：内圈吸附、形成含Pb碳酸钙（PbCaCO3）沉淀和外圈吸附。内圈吸附和形成PbCaCO3沉淀说明土壤中的碳酸钙对Pb具有强烈吸附作用。土壤对Pb的吸附随初始Pb浓度的增大（500～1 000mg.L-1）,第一配位层（Pb—O）半径减小（0.169 2～0.166 8nm）,说明内圈吸附比重加大。

英文摘要：

Adsorption mechanisms of Pb on soil with high CaCO3 content were investigated by combined batch sorption and X-ray absorption fine structure（XAFS）.Date from the batch equilibrium studies showed that Pb sorption was nonlinear and was well fitted to Langmiur isotherm.The XAFS data indicated that Pb could be adsorbed via the inner-sphere complex,the precipitation of calcium carbonate containing Pb（PbCaCO3）,and outer-sphere Pb sorption complex.The formations of inner-sphere complexes and PbCaCO3 implied strong metal interactions with the surfaces the mechanistic reason for the affinity of Pb for CaCO3 as observed in macroscopic studies.At low metal concentration,500 mg·L-1 of initial Pb,radial distance of the first-shell Pb—O（R1） was 0.169 2 nm,however,at 1 000 mg·L-1 of initial Pb,the R1 was 0.166 8 nm.These revealed that the percentage of inner-sphere complexes increased when the initial Pb was increased from 500 to 1 000 mg·L-1.