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| Effect of bioturbation by worms on the transport of Pb and Cd between sediments and waters |
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Abstract Effects of bioturbation by worms on the transport of Pb and Cd in the sediments sampled from the upstream of Songhua River were studied by the simulated testing, and the contents of Pb, Cd in worms were analyzed too. The results showed that bioturbation to sediment suspension would promote the release of Pb and Cd on the sediments. Pb and Cd derived from sediments were adsorbed on the suspending particalates, but not enriched in the worms. The contents of Pb in worms were markedly increased with exposure time when Pb was added into overlying water, mainly ascribed to the metabolic way of worms. Higher concentrations of Pb were oberserved only on the surface of sediments in the treatment without worms but in different depths with worms. Bioturbation not only increased significantly concentrations of Pb and Cd in waters, but promoted the diffusion from overlying waters to deeper parts of sediments.
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Received: 24 June 2009
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CHEN Huan-Yu, LIU Jing-Qing, WEI Zong-Yuan, ZHANG Hui-Hui, HE Xiao-Fang, ZHOU Xiao-Yan, QIU Shang-De, HU Bao-Lan, LOU Li-Ping. Radial differences in contaminant distribution in large-diameter pipe scales of main pipelines in drinking water distribution system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(9): 2706-2712. |
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