LIN Jing1, YAN Haiyu1,2, YANG Guanghong1
(1.School of Public Health, the key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang 550025, China; 2. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China)
Abstract: In order to clarify the current status and potential risks of mercury in river water, biofilm and sediment of mercury polluted rivers, this study selected the Dongmenqiao River as the research object, collected river water, biofilm and sediment samples, and determined contents of mercury in these samples. The results showed that the average contents of total mercury (THg), dissolved mercury (DHg) and particulate mercury (PHg) in the Dongmenqiao River were 66.46±51.87 ng/L, 10.67±5.15 ng/L and 55.79±50.26 ng/L, respectively, the PHg content is as high as 72%. The average contents of THg and MeHg in biofilm samples were 9.38±12.39 mg/kg and 19.58±22.21 μg/kg, respectively. The average contents of THg and MeHg in sediment samples were 30.89±24.64 mg/kg and 21.50±7.20 μg/kg, respectively. The seasonal distributions of mercury in water and biofilm samples were similar with a trend of summer > autumn > spring. The mercury contents increased gradually in water samples and decreased gradually in sediment and biofilm samples as distances of sampling points to the total sewage outlet increased, reflecting the effect of dredging and municipal sewage discharging.
Key words: mercury; sediment; biofilm; distribution characteristics
EARTH AND ENVIRONMENT Vol.48, No.3, Tot No.335, 2020, Page 341-347
