Ecological risk assessment and source analysis of heavy metals in surface sediments of rivers located in the hilly area of southern China
XU Jin-ying1,2, ZHENG Li-lin1,2, XU Li-gang1, WANG Xiao-long1
1. Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; 2. University of Chinese Academy of Science, Beijing 100049, China
Abstract：Heavy metals are characterized with toxicity, persistence and bioaccumulation, can exert significant adverse effect on the health of human beings and other organisms through food chain. In aquatic ecosystem, sediment is both the sink and the source of heavy metals. Thus, it's of great importance to study heavy metals in surface sediment to keep the aquatic ecosystem in good condition. In this study, the spatial distribution, source analysis, and corresponding ecological risk of heavy metals in surface sediments of four main rivers (Minjiang River, Qiantangjiang River, Oujiang River and Jiulongjiang River) in the hilly area of southern China was analyzed. Our results showed that the relative higher values of metal group of Mn-Zn-As-Cd-Pb were observed in Jiulongjiang River. Moreover, the highest values of metal group of Ni-Cu, Cr-Sb, Al-Co-V were found in Qiantangjiang River, Oujiang River and Minjiang River, respectively. However, no significant difference of the heavy mental contents were tested among the four rivers (P>0.05). Pollution assessment based on SQGs, Igeo and EF exhibited that sediments were moderately or seriously polluted by Cd and some sites were slightly polluted by Mn, Zn, and Pb. In addition, the RI assessment showed that heavy metals in sediments of our studied rivers posed extreme high potential of ecological risks. Multivariate analysis indicated that Mn, Zn, As, Cd and Pb mainly came from natural process, agricultural and mining activities; Cr, Ni and Sb may mainly come from instrial wastewater While industrial wastewater and Al, Co, V may mainly derived from natural process. And Cu derived from multiple sources above. By RDA analysis, the pH, TP, TN and LOI were the main environmental factors influencing heavy metal concentrations in the sediments. This study can provide important information for the protection of river ecosystem.
徐金英, 郑利林, 徐力刚, 王晓龙. 南方丘陵区河流表层沉积物重金属污染评价[J]. 中国环境科学, 2019, 39(8): 3420-3429.
XU Jin-ying, ZHENG Li-lin, XU Li-gang, WANG Xiao-long. Ecological risk assessment and source analysis of heavy metals in surface sediments of rivers located in the hilly area of southern China. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(8): 3420-3429.
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