Abstract:In order to understand the distribution of mercury and its response to eutrophication in reservoirs in Guizhou Province, six reservoirs including Sanbanxi, Longtan, Wanfeng, Baihua, Hongfeng, and Aha Reservoirs, were chosen in this study. Surface water samples were collected during the period from November to December in 2012.Trophic status, morphology, and species of Hg level in each sample were determined. Our results showed that, the six reservoirs presented different trophic status, with oligotrophic for the Sanbanxi and the Longtan, oligo-mesotrophic for the Wanfeng, mid-eutrophic for the Baihua and Hongfeng, eutrophic for the Aha Reservoir, respectively. The average total Hg concentration in surface water samples was (5.82±4.99)ng/L the corresponding MeHg concentrations was (0.080±0.068) ng/L. the mean concentration of MeHg in surface water samples in Aha Reservoir was 0.258ng/L, which was approximately 2~10times higher than those in the other five reservoirs. TLI in surface water samples was positively correlated with THg (r=0.477,P<0.05,n=19), MeHg (r=0.558,P<0.05,n=19), and DMeHg (r=0.502,P<0.05,n=19), respectively. The eutrophication is probably one of the key factors which controls the geochemical cycle of Hg in waterbody in the selected six reservoirs. The deterioration of water quality (i.e. hypoxia, decreasing pH, etc.) and overgrowth of phytoplankton resulted from Eutrophication influenced the distribution and transformation of species of mercury in the ecological system of reservoir.
高廷进, 李秋华, 孟博, 何天容, 张垒, 欧腾, 黄国佳, 邓龙. 贵州高原水库汞的分布特征及其对富营养化的响应[J]. 中国环境科学, 2014, 34(5): 1248-1257.
GAO Ting-Jin, LI Qiu-Hua, MENG Bo, HE Tian-Rong, ZHANG Lei, 欧Teng , HUANG Guo-Jia, DENG Long. Distribution of mercury and its response to eutrophication in reservoirs in Guizhou Province. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(5): 1248-1257.