农业环境科学学报Issue(11)：2228-2233,6.DOI:10.11654/jaes.2014.11.022
达里诺尔湖表层沉积物中Hg、As的形态分布及释放特性
Fractions and Releases of Mercury and Arsenic in Sediments of Dalinuoer Lake, China
摘要
Abstract
Fractions and releases of a heavy metal in sediments affect its environmental behaviors. In this work, a seven-step sequential ex-traction method was used to extract mercury(Hg)and arsenic(As)in the surface sediments from Dalinuoer Lake. Also, releasing of Hg and As from the sediments at different pH was examined. The results showed that Hg bioavailability in sediments was primarily fraction bound to humic acid, and that of As was carbonates and Fe-Mn oxides fractions. Releases of Hg and As from the sediments were little in alkali and weak alkaki solution, but significant in strong alkali solution. Pre-extraction by acid solution resulted in more Hg and As released in alka-line extraction because dissolution of the metal oxides exposed more metals bound to humic acid. Likewise, more Hg and As were extracted in acid solution after the sediments were pre-extracted with alkali solution, due to exposed Fe-Mn oxides from dissolution of the humic acid by alkali solution. Keeping lake water under weak alkaline conditions is the key to health and ecological safety in Dalinuoer Lake.关键词
达里诺尔湖/沉积物/Hg/As/形态/释放Key words
Dalinuoer Lake/sediments/mercury/arsenic/fractions/releasing分类
资源环境引用本文复制引用
李云飞,何江,吕昌伟,恩和,都达古拉,谢志磊..达里诺尔湖表层沉积物中Hg、As的形态分布及释放特性[J].农业环境科学学报,2014,(11):2228-2233,6.基金项目
国家自然科学基金 （）
