• 研究报告 •

### 阿哈水库沉积物-水界面重金属扩散通量

1. (1贵州师范大学， 贵州省山地环境信息系统与生态环境保护重点实验室， 贵阳 550001；2中国科学院地球化学研究所环境地球化学国家重点实验室， 贵阳 550081)
• 出版日期:2019-05-10 发布日期:2019-05-10

### Diffusion fluxes of heavy metals at the sediment-water interface during summer and winter from Aha Reservoir, Guiyang.

XIAO Xiong1,2, LONG Jian1*, ZHANG Run-yu2*, CHEN Jing-an2, ZOU Yin-hong2, WU Qiu-sheng1, WU Jin-nan1

1. (1Key Laboratory for Information System of Mountainous Areas and Ecological Environmental Protection of Guizhou Province, Guizhou Normal University, Guiyang 550001, China; 2State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China)
• Online:2019-05-10 Published:2019-05-10

Abstract: Distribution characteristics and interfacial diffusion fluxes of seven heavy metals (Co, Ni, Cu, Zn, As, Cr, and Pb) were examined in the overlying water and sediment porewater from four sampling sites from Aha Reservoir in summer and winter, to understand the pollution status of dissolved heavy metals in the water body. Results showed that the average concentrations of dissolved heavy metals in the overlying water from Aha reservoir were lower than the standard of Grade I of Environmental Quality Standard for Surface Water (GB 3838-2002) and the Sanitary Standard for Drinking Water (GB 5749-2006) in China. Concentrations of As, Co and Cr in the bottom water increased during the anoxic period in summer, and the vertical changes of all heavy metals during the mixed season in winter were not significant. The mean concentrations of heavy metals in pore water were significantly higher than that in overlying water. There were significant positive correlations among Co, Ni and As, indicating their migration and transformation processes being affected by the iron-manganese cycle in Aha Reservoir. Concentrations of Cu, Zn and Pb had a positive correlation with the same pollution source. Results from the analysis of the diffusion fluxes of heavy metals at the sediment-water interface (SWI) showed that Zn remained negative diffusion, which indicated that sediment had a good adsorption effect on Zn. Co, Ni, As and Pb showed positive values at the SWI. The concentration of As reached 2.07 μg·cm-2·a-1 in summer, which may impose a greater release risk on the overlying water. Our results demonstrated that the pollution control of heavy metals had achieved remarkable results in the past decade in Aha Reservoir.