调水后河床表层沉积物中重金属的形态转化  

Chemical Speciation Transformation of Heavy Metals in Sediments after Water-Received

作　　者：孙亚乔[1,2] 段磊[1,2] 窦琳[1,2] 乔晓霞[3] 申圆圆[1,2] 

机构地区：[1]长安大学环境科学与工程学院,陕西西安710054 [2]教育部旱区地下水文与生态效应重点实验室,陕西西安710054 [3]四川交通职业技术学院道路与桥梁工程系,四川成都611130

出　　处：《人民黄河》2014年第9期86-88,91,共4页Yellow River

基　　金：国家自然科学基金资助项目(41102150;41002086;41372258);陕西省自然科学基金资助项目(2013JM5003);中央高校科研专项基金资助项目(2013G1291065;2013G1291067;2013G1502036)

摘　　要：通过河床表层沉积物重金属释放实验,分析并揭示了受客水后河床表层沉积物中重金属Co、Cr、Mn、Mo、Pb、V的赋存形态转化机理。结果表明:受水区的环境条件(pH值、Eh值等)变化、沉积物理化性质变化和环境中微生物的作用,重金属生物有效态及残渣态之间的相互转化,改变了重金属的生物有效性,在受客水过程中受溶解沉淀、吸附解吸、氧化还原和离子交换等地球化学作用的影响,河床沉积物中重金属发生迁移转化,在不断受水条件下河床沉积物中重金属不断释放,沉积物不断净化。The chemical speciation transformation of heavy metals Co、Cr、Mn、Mo、Pb and V in sediments had been investigated through heavy met-als release experiment. The results show that the biologically effective of heavy metal have been changed due to the change of the water environmen-tal conditions (pH value and Eh value),physical and chemical properties of sediments,and action of microorganisms in sedimentary environment. For the geochemical role of dissolution and precipitation,adsorption and desorption,oxidation and reduction,and ion exchange,the heavy metal in sediments are migration and transformation. So,the heavy metal in sediments is releasing after water-received,and the sediment environment is pu-rifying continuously.

关 键 词：表层沉积物 重金属 赋存形态 转化机理 客水 

分 类 号：X522[环境科学与工程—环境工程]