摘要
Abstract
Objective] The aim was to discuss heavy metal pollution level in sediments of irrigation water sources and its potential ecological risk. [ Method] Collecting 6 sediment samples from Hongqili and Hengqinhai in Zhongshan City in Guangdong Province, Pb, Cd, Cr, As, Hg content was determined and distribution characteristics were analyzed. By using comprehensive index method, land accumulation index method and potential ecological harm index method, the heavy metal pollution status in sediments and potential ecological risk were evaluated. [ Re-sult] There was heavy metal compound pollution situation in sediments, the content of Pb, Cd, Cr, As, Hg in the samples was higher than reference value. In sediment of Hongqili, the order of heavy metal enrichment degree was Pb, Cd,Cr,Hg,As, in sediment of Hengqinhai, the order of enrichment degree was Cd>Cr>Hg>As>Pb, the order of potential ecological harm was Hg,Cd,Cr,As,Pb, which was in light eco-logical risk grade. [Conclusion] There are many kinds of heavy metal pollution in the sediment of 2 main irrigation water sources(Hongqili and Hengqinhai) in Zhongshan. The pollution level is at moderate to severe pollution, wastewater discharge of industrial park is one of the main reasons for heavy metal pollution.关键词
重金属/底泥/污染特征/生态风险/灌溉水源Key words
Heavy metal/Sediment/Pollution characteristics/Ecological risk/Irrigation water source分类
农业科技
