分级提取ICP-MS法考察黄铁矿中重金属的相态分布  

Study on Phase Distribution and Release of Heavy Metal in Pyrite Using Sequential Extraction Procedure and ICP-MS

作　　者：张平[1] 齐剑英[1] 杨春霞[1] 陈永亨[1] 

机构地区：[1]广州大学环境科学与工程学院广州市污染控制与同位素应用重点实验室

出　　处：《光谱学与光谱分析》2007年第6期1207-1209,共3页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金委员会-广东省人民政府联合基金项目(U0633001);国家自然科学基金项目(20477007);广东省自然科学基金重点项目(36210);广州市科技计划项目(2004J1-C0331);广州市属高校科技计划项目(62013);广东省重大科技专项(2004A3038002)资助

摘　　要：ICP-MS同时测定黄铁矿中的V,Cr,Mn,Co,Ni,Cu,Zn,Sr,Mo,Cd,Sb,Ba和Pb等13种重金属元素,给出了这些元素的测量线性范围,线性关系良好,相关系数r>0·997,检出限为0·005～0·01μg·L-1,相对标准偏差(RSD)均小于5%。进一步的分级提取实验考察了黄铁矿中重金属的相态分布。结果表明,黄铁矿中的重金属以Pb为主,总量达830mg·kg-1,并且Pb主要存在于碳酸盐相中或直接以PbS形式存在,这部分的Pb达56·9%,铁氧化物相中的Pb次之,为29·7%,Pb在硫化物相和硅酸盐相中较少,分别为3·5%和9·9%。黄铁矿在自然条件下以Pb释放为主,Cr和Cd的释放也不容忽视。Heavy metal elements of V, Cr, Mn, Co, Ni, Cu, Zn, Sr, Mo, CA, Sb, Ba and Pb were determined by ICP-MS. The linear ranges of determination for these elements were obtained, and the correlation coefficients were larger than 0. 997. The detection limit ranges were from 0. 005 to 0. 01 μg · L^-1 and the RSDs were lower than 5%. Phase distributions of heavy metals in pyrite were analyzed by ICP-MS with sequential extraction procedure. The result showed that Pb was the main heavy metal in pyrite and its total content was 830 mg · kg^-1. Pb existed mostly in carbonate or galena （PbS） phase of pyrite and the proportion was 56. 9%. Pb existed less in iron oxides with 29. 7% in proportion, and least in sulfide and silicate with 3. 5% and 9. 9%, respectively. The release of Pb in pyrite was primary in natural environment, but the release of Cr and CA was not be ignorable, too.

关 键 词：ICP-MS 分级提取 黄铁矿 重金属 相态分布 

分 类 号：O657.3[理学—分析化学]