重金属元素BCR提取法及在太湖沉积物研究中的应用  

Determination of Heavy Metal Chemical Forms by BCR Method for Taihu Lake Sediments

作　　者：刘恩峰[1] 沈吉[1] 朱育新[1] 

机构地区：[1]中国科学院南京地理与湖泊研究所

出　　处：《环境科学研究》2005年第2期57-60,共4页Research of Environmental Sciences

基　　金：中国科学院知识创新工程项目(KZCX1-SW-12-Ⅰ);中国科学院南京地理与湖泊研究所创新项目(CXNIGLAS-A02-05)

摘　　要：采用BCR提取法,HCl-HNO3-HF消化法和ICP-AES仪器测定了西太湖沉积岩芯中Cu,Fe,Mn,Ni,Pb和Zn6种重金属元素不同形态的质量分数。结果表明:采用BCR方法对太湖沉积物重金属元素形态进行提取,提取结果具有较高的精度和稳定性;受元素地球化学性质及沉积物理化性质的影响,Cu,Fe,Ni和Zn以残渣态为主;Mn以可交换态及碳酸盐结合态为主;Pb的有机物及硫化物结合态,Fe Mn氧化物结合态以及残渣态的质量分数基本一致;重金属元素Fe Mn氧化物结合态的质量分数与可还原态Mn质量分数有较好的正相关性,有机物及硫化物结合态的质量分数与有机质质量分数相关性较好。Chemical forms of heavy metals (Cu, Fe, Mn, Ni, Pb and Zn( in Taihu Lake sediments are studied using BCR sequential extraction procedure, HCl-HNO_3-HF digestion method and ICP-AES. The results show that the BCR method has better stability for heavy metals chemical forms extraction of Taihu Lake sediment. Affected by the geochemical properties of the heavy metals and the physiochemical characteristics of the sediments, Cu, Fe, Ni, Zn are mainly associated with residual fraction, Mn is mainly associated with exchangeable and carbonate fractions, Pb has the identical distribution in organic/sulphide fractions, Fe/Mn oxide fractions and residual fraction; the Fe/Mn oxide fractions of heavy metals have good correlation with Mn of Fe/Mn oxide fractions, and the organic/sulphide fractions of the heavy metals have good correlation with TOC.

关 键 词：重金属 BCR 沉积物 太湖 

分 类 号：X524[环境科学与工程—环境工程]