深圳湾潮间带湿地沉积物的重金属分布特征

对深圳湾潮间带湿地的9个采样点采集的沉积物样品进行了分析，测定了沉积物的粒径分布、重金属(Cu，Zn，Cr，Pb，Ni)的总量和生物有效态含量．分析了深圳湾湿地沉积物重金属含量的时空变化以及重金属不同形态之间的关系，从生物有效态含量在总量中占有的比例说明了深圳湾重金属污染比较严重，对重金属生物有效态的测定方法进行了简化．对各采样点的重金属积累量与底栖动物群落之间可能存在的关系进行了讨论．

Spatial Distribution of Heavy Metals in Inter-tidal Wetlands of Deep Bay, Shenzhen

Heavy metal in sediments is one of the key issues for environmental and ecological protection in coastal areas. Note that the value of inter tidal area as the most important and sensitive indicator for the ecological health in Deep Bay system, Shenzhen, this study presents a special investigation of heavy metals in inter tidal wetlands therein. Sampling was conducted at 9 locations in April, June, July and September respectively, 1998. Through the experimental analysis of samples, sediment characteristics such as particle size distribution, total heavy metals and their speciation with particular attention to bio availability were investigated for Cu, Zn, Cr, Pb and Ni, respectively. Meanwhile, the spatial and temporal variations and accumulation characteristics of heavy metals in wetland sediments were discussed in connection with the interrelationship between speciation. A simpler method for measuring bio availability was used, which is more efficient with equivalent accuracy with the conventional Tessier step extraction method. It is found that the heavy metal pollution in the concerned inter tidal area is relatively heavy and probably responsible for the slight degradation of wetland ecosystem in recent years.