Affiliations: Department of Environmental Engineering, Zhejiang
University, Hangzhou 310029, China | Nanjing Institute of Geography and Limnology, Chinese
Academy of Sciences, Nanjing 210008, China
Abstract: Spatial distribution of heavy metals, arsenic and organic matter in
recent sediments in the Hangzhou section of the Grand Canal and their
relationships were analyzed. The results showed that the concentrations of
heavy metals and organic matters varied widely along the canal, and the average
geological accumulation factors decreased in the following orders: organic
carbon(2.6), zinc(2.1), cadmium(2.0), copper(1.5), 1ead(1.1), nitrogen(0.9),
mercury(0.8), phosphorus(0.4), arsenic(0.2) and chromium(0). Content of heavy
metals and organic carbon in the top t0 cm layer were lower than that of lower
layers, except for mercury and organic carbon in the S9 section. Contents of
organic carbon in the top 50 cm layer of the mud sediments are significantly
higher than those undemeath. In the bottom mud layer, there is a concentration
peak of the pollutants. In the mud sediments of the canal, cadmium mainly
occurred in the Fe and Mn oxide fraction, copper in the organic fraction, lead
in the Fe and Mn oxide fraction, and zinc in the carbonate and the Fe and Mn
oxide fraction.
Keywords: sediment, pollution characteristics, Grand Canal, geological accumulation factor, fraction of heavy metals