南京工业大学毕业论文——沉积物金属总量及形态分析精要.doc

南京工业大学 沉积物金属总量及形态分析 环 境 学 院  摘 要BCR连续提取法分析沉积物中重金属元素总量与形态分布，并用ICP-OES测定金属含量。 结果表明Cu、Zn主要分布于残渣态，Pb主要分布于可还原态，因而，Pb的环境行为较值得关注。 关键词：The total metals of sediment and the analysis of speciation ABSTRACT The subject takes the Nanjing section of Yangtze River as the main object of study, and 21 samples were collected from upstream to downstream. Physicochemical properties of sediment samples, including the pH value, cation exchange capacity and organic matter content were examined. Fractions of the metals(Cu, Zn and Pb) in the collected samples were analysed using the modified BCR sequential extraction. Total metal amount were also analyzed. ICP-OES were used to determine the content of metals in extracted solution.???? The results showed that Cu, Zn mainly distributed in the residues, Pb mainly in the reducible fraction, therefore, Pb had the greatest environmental effects.显示对应的拉丁字符的拼音 Keyword: sediment heavy metals fractions目 录 摘 要…………………………………………………………………… I ABSTRACT…………………………………………………………… II 第一章 …………………………………………………………… 1 1.1 研究意义…………………………………………………………………..1 1.2 研究现状…………………………………………………………………..1 1.2.1 国外研究现状………………………………………………………1 1.2.2 国内研究现状……………………………………………………….. 2 1.3 沉积物中的重金属………………………………………………………… 2 1.3.1 重金属的迁移转化规律…………………………………………….. 3 1.3.2 重金属的化学形态分析 …………………………………………… 5 第二章 …………………………………… 7 2.1 研究区域背景………………………………………………………………7 2.1.1 地理环境…………………………………………………………….7 2.2.2 水环境……………………………………………………………...8 2.2仪器和试剂………………………………………………………………….9 2.2.1 实验试剂……………………………………………………………..9 2.2.2 实验仪器……………………………………………………………..9 2.3 样品采集…………………………………………………………………… 9 2.3.1 沉积物采集………………………………………………………. .9 2.3.2 样品预处理……………………………………………………….10 2.4 实验内容…………………………………………………………………… 10 2.4.1 沉积物pH值………………………………………………………10 2.4.2 沉积物阳离子交换量…………………………………………… .10 2.4.3 沉积物有机质含量………………………………………………..11 2.4.4 沉积物重金属元素总量分析……………………………………..12 2.4.5 沉积物形态分析…………………………………………………..12 第三章 实验结果与讨论……………………………………………… 3.1 沉积物样品基本理化性质………………………………………………… 14 3.1.1