Heavy metals and phosphorus in tidal flat sediments of the Yangtze estuary |
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| Authors: | Gao Xiaojiang PhD Chen Zhenlou Zhang Nianli Xu Shiyuan Chen Limin |
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| Institution: | 1. Dept. of Environmental Science and Engineering, Fudan University, Shanghai 200433,China
2. Department of Geography, East China Normal University, Shanghai 200062, China |
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| Abstract: | Concentrations of heavy metals (Cu, Pb, Zn, Cr and Cd), and phosphorous (P) were determined in surface tidal flat sediments
of the Yangtze estuary and Shanghai coast. Results demonstrate that there were significant differences among the accumulation
of the heavy metals in sediments, following the order: Zn > Cu > Cr > Pb > Cd. The spatial distribution and chemical forms
of heavy metals in tidal flat sediments were closely related to the distribution of pollution resources (outlet of sewage)
and the local sedimentary and hydrodynamic conditions. The dominated form of non-residual heavy metals is bound to Fe/Mn oxides,
and the next form is bound to carbonates. Moreover, contents of total P in sediments range from 18.0 μmol.g−1 to 31.4 μmol.g−1 along the coastline, speciation of P in sediments was different, most of P in tidal flat sediments is associated with calcium
phases (as Ca-P) similar to marine sediments. |
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| Keywords: | heavy metals phosphorus tidal flat sediments Yangtze estuary |
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