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.
路永正, 阎百兴. 颤蚓扰动作用对铅镉在沉积物-水相中迁移的影响[J]. 中国环境科学, 2010, 30(2): 251-255.
LU Yong-Zheng, YAN Bai-Xing. Effect of bioturbation by worms on the transport of Pb and Cd between sediments and waters. CHINA ENVIRONMENTAL SCIENCECE, 2010, 30(2): 251-255.