Distribution and pollution characteristics of heavy metals in sediments of Puding Reservoir, Guizhou Province
TANG Li1, LI Qiu-hua1, CHEN Chuan1, WANG Long1, HE Ying1, CHEN Feng-feng2, GAO Yong-chun3, LUO Lan3
1. Key Laboratory for Information System of Mountainous Area and Protection of Ecological Environment of Guizhou Province, Guizhou Normal University, Guiyang 550001, China; 2. School of Public Health, Guizhou Medical University, Guiyang 550025, China; 3. Guizhou Hydrology and Water Resources Bureau, Guiyang 550002, China
Abstract：Five sediment cores were collected at typical sites in Puding Reservoir, located in Guizhou Province. The spatial distribution and sources of selected heavy metals (Cr, Ni, Cu, Zn, As, Cd, Pb and Hg) in the sediments were investigated, and the ecological risks of those heavy metals were assessed. The results showed that:1) the average concentrations of Cr, Ni, Cu, Zn, As, Cd, Pb and Hg were (151.8±24.0), (82.1±5.4), (150.3±26.8), (546.9±180.3), (48.7±12.1), (3.9±2.6), (284.9±188.5) and (0.23±0.13)mg/kg, respectively. These concentrations were higher than the Guizhou soil background values. The concentrations of Zn, As and Hg were evenly distributed and siginificant differences (n=34, P<0.05) of the concentrations of Cr, Ni, Cu, Cd and Pb were observed in different sites. The accumulation of Hg concentrations in vertical profiles of sediments was not obvious. For heavy metals such as Cu, Zn, As, Cd and Pb, their concentrations in middle sediments were higher than those in bottom, and turned down at surface sediments. The concentrations of Cr, Ni were kept stable in bottom sediments and decreased in surface sediments. The variation tendency of these seven heavy metals indicated the degree of contamination had already relieved in surface sediments. 2) According to the three indexes, severe levels of pollution were observed in sediments of Puding Reservoir. Based on the geoaccumulation index and sediment quality guidelines, Pb was obviously enriched in sediments of Puding Reservoir. The potential ecological risk of Cd was higher in the sediments. Thus, Pb and Cd were considered as the dominant pollutants in sediments of Puding Reservoir. 3) Pearson correlation coefficient indicated that positively significant correlations (P<0.01) were found between Cr and Zn, as well as Ni and Zn. Same relationships were observed among these five heavy metal (Cu, Zn, As, Cd and Pb) in sediments. Based on the principal component analysis, two major components were identified in heavy metals. One of the major component was consisted by four heavy metals (Zn, As, Cd and Pb), Cr and Ni was contained in the other one. According to the statistics results, it could imply that the concentrations of four heavy metals (Zn, As, Cd and Pb) and another two heavy metals (Cr, Ni) in sediments were influenced mainly by mining and industrial emissions around Puding Reservoir, respectively.
唐黎, 李秋华, 陈椽, 王龙, 何应, 陈峰峰, 高永春, 骆兰. 贵州普定水库沉积物重金属分布及污染特征[J]. 中国环境科学, 2017, 37(12): 4710-4721.
TANG Li, LI Qiu-hua, CHEN Chuan, WANG Long, HE Ying, CHEN Feng-feng, GAO Yong-chun, LUO Lan. Distribution and pollution characteristics of heavy metals in sediments of Puding Reservoir, Guizhou Province. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(12): 4710-4721.
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