Geochemical characteristics of heavy metals in riparian sediment pore water of Songhua River,Northeast China |
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| Authors: | Hui Zhu Baixing Yan Xiaofeng Pan Yuhong Yang Lixia Wang |
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| Institution: | (1) Department of Hydrogeology and Environmental Geology, China Geological Survey, No. 24, Huangsi Street, Beijing, 100011, China;(2) UNESCO Office Beijing, Building 5, Waijiaogongyu, Jianguomenwai, Beijing, 100600, China;(3) China University of Geosciences, No. 29 Xueyuan Road, Haidian District, Beijing, 100083, China |
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| Abstract: | This study reports the geochemical characteristics of zinc (Zn), copper (Cu), lead (Pb), nickel (Ni), mercury (Hg), iron (Fe),
and manganese (Mn) in the riparian sediment pore water of the Songhua River, Northeast China. In total, 36 pore water samples
and 18 surface water samples from three typical sections were collected and analyzed in June 2009. Cluster analysis of heavy
metals was performed to analyze the pollution sources of the metals. Results showed that Hg concentrations in the pore water
were greater than those in the surface water, indicating a potential ability of Hg release from riparian sediment system to
river water. However, concentrations of Fe and Mn in the surface water were greater than those in the pore water, demonstrating
that the microenvironments of riparian and riverbed sediment systems were quite different. Variations of Zn, Cu, Pb and Ni
between the surface and the pore water were different in each section. Most metals had similar horizontal and profile distribution
characteristics in the three sections except for Zn and Ni. Hg, Fe and Mn concentrations in the pore water increased gradually
with the increase in horizontal distance from water body, in contrast to this, Cu decreased, and Pb presented a fluctuating
trend. With the increase in depth, Pb and Fe, Cu and Mn showed the same trends, and Hg showed a variable trend. The above
distribution characteristics could mainly be attributed to the properties and the interactions of metals, pH and oxidation-reduction
conditions, and the complex pollution sources and hydrologic regime in history. The probable sources of metals include the
historical and ongoing discharge of industrial wastewater, mining activities, sewage irrigation for agricultural production,
and atmospheric deposition from coal-fired plants. |
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