Spatial distribution features and environment effect of heavy metal in intertidal surface sediments of Guanhe estuary, Northern Jiangsu Province |
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Authors: | Jiaxiang Huang Yong Yin Jun Xu and Xiaobing Zhu |
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Institution: | (1) The Key Laboratory of Coast and Island Development of Ministry of Education, Nanjing University, Nanjing, 210093, China;(2) Water Resources and Environment College, Hohai University, Nanjing, 210098, China |
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Abstract: | In northern Jiangsu coastal zone area, Guanhe River is the biggest river and has the best navigation conditions among rivers
which flow into the Yellow Sea. The grain sizes show gradual increase from the high intertidal zone to lower intertidal zone.
The heavy metal values have slight changes along both sides of the river mouth, but show an evident change perpendicular to
the tidal flat. In the latter case, they show a good correlation with grain size fluctuation, that is, the heavy metal values
gradually decline when the grain size increases from the high intertidal zone to the lower intra-tidal zone. Analyses of the
heavy metal elements show that on the Guanhe estuary surface sediment, the content of the elements Hg, As and Cu is above
background values; Pb and Zn contents are rather close to the background values; and Cd content is less than the background
values. The element Hg comes out to be harmful in a medium level to ecological environment, while the elements of Cr, As,
Cu, Pb, Zn and Cd fall in a safe range of MPL. On the whole, Guanhe estuary tidal flat is not very harmful to the ecology
in terms of the heavy metals.
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Translated from Marine Geology & Quaternary Geology, 2007, 27(5): 23–32 译自: 海洋地质与第四纪地质] |
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Keywords: | grain size heavy metals correlation tidal flat Guanhe estuary |
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