长江口泥沙与沉积物对磷酸盐的吸附和解吸研究

在长江口河段布点采样、实验室分析的基础上，从动力学、磷的等温吸附、pH值、盐度和泥沙含量对磷酸盐的吸附和解吸的影响诸方面，对长江口泥沙和沉积物对磷酸盐的吸附和解吸进行分析研究，确定了相应的关系式及变化规律，并计算得到磷酸盐的吸附-解吸平衡时间、泥沙的饱和吸附量、解吸量及细颗粒泥沙对磷的表观等量吸附热。实验分析结果有助于长江口及临近海域富营养问题的研究，对长江口水质管理、污染控制具有指导意义。

A Study on The Sorption and Desorption of Phosphate by Sediments in the Yangtze River Estuary

The phosphorus is an important nutritious substance in biosphere. It is indispensable for probing into eutrophication to study on the phosphorus forms in sediments in the Yangtze River estuary. On the basis of results from site monitoring around the Yangtze River estuary and experimental analysis for those samples, the sorption and desorption of phosphate by suspended sediments and sediments in the Yangtze River estuary were studied on aspects such as dynamics, isothermal adsorption of phosphate by suspended sediments and sediments, as well as effects of pH, the salinity,and the concentration of sediments. The relation between phosphate and those factors was obtained. Adsorption equilibrium time, saturated adsorption quantity by sediments, corresponding release quantity, and so on, were calculated. The results are of importance to the water quality administration and pollution control in the Yangtze River estuary.