生态环境学报2017，Vol.26Issue(9)：1547-1553,7.DOI:10.16258/j.cnki.1674-5906.2017.09.013
乌梁素海盐度变化对沉积物重金属有效性的影响
Impacts of Salinity Change on the Effectiveness of Heavy Metals in the Sediment of Wuliangsuhai
摘要
Abstract
Heavy metals released from the sediment of endogenous source in Ulansuhai have a great impact on its aquatic environment. To get a better understanding on the release mechanism and effect factors, lake water was sampled yearly at 18 selected sampling points in the lake in August from 2010 to 2016. The top layer sediments were sampled at 10 sampling points in August 2016. The contents of the heavy metals were analyzed and four species of Cu, Pb, Zn, and Cr were extracted by the BCR step method. A static reaction was carried out to determine the release characteristics of the heavy metals from the sediments under different salinity conditions. The results showed that the salinity of Ulansuhai water was increasing from 2010 to 2016, which showed a trend from the freshwater lake to the brackish water lake. The release amount of the heavy metals form the sediments were affected by the total content, species content, and migration ability of the heavy metals. The species contents of Cu, Pb, Zn, and Cr were mainly in residual, in which the residual state of Pb was the most, as a result of this, its total and release amounts were the least. The contents of the heavy metals in the sediments were less extractable. The mobility of the heavy metals was Zn>Cu>Pb>Cr. The release amount of Zn was positively related to its migration activity and total amount in the sediments. The release amounts of the heavy metals form the sediments were also affected by the organic matter content, pH, and water content of the sediments, in which Pb has the weakest metallicity with lower solubility and minimum release amount. With the increase of the salinity in the sediments, the release amounts of Zn, Cu, and Pb increased, while the release amount of Cr represented decreased when the salinity increased to a certain extent. Although the release rates of the heavy metals from the sediments were relatively less, there was a great increase in the release amount with the increase of the salinity. This indicated that there might be a greater risk on the lake water ecological environment.关键词
沉积物/重金属/盐度/释放Key words
Sediment/Heavy metal/Salinity/release分类
资源环境引用本文复制引用
吕杰,李畅游,贾克力,张生,史小红,赵胜男,孙标..乌梁素海盐度变化对沉积物重金属有效性的影响[J].生态环境学报,2017,26(9):1547-1553,7.基金项目
国家自然科学基金项目(51509133 （）
51339002 （）
51669022 （）
2016MS0406 （）
NJZC13092) （）
