中文摘要：

泥沙是水体中无机活性磷的主要载体。为研究东洞庭湖饱和性吸附无机活性磷的天然泥沙解析再吸附规律,采用室内模拟实验考察饱和性吸附无机活性磷的泥沙解析-再吸附影响因素与特征。结果表明：扰动状态下饱和性吸附无机活性磷的泥沙,其水相无机活性磷平衡浓度及解析无机活性磷速率均比静态大。扰动强度为220 r/min时,饱和性吸附无机活性磷的泥沙水相无机活性磷平衡浓度是静态1.65倍,解析无机活性磷速率是静态6.46倍;扰动条件下饱和性吸附无机活性磷的泥沙在快速解析阶段,其解析无机活性磷速率与含沙量成正相关性;扰动状态下,饱和性吸附无机活性磷的泥沙再吸附无机活性磷过程符合Freundlich等温式,但随水体含沙量增大,其再吸附的平衡吸附量则呈下降趋势;扰动作用下,水体p H值显著影响饱和性吸附无机活性磷的泥沙解析过程。中性水体,解析量最小,降低或升高水体p H值,解析量均增大。

英文摘要：

The objective of the paper is to study lake sediment which is considered as a major carrier of inorganic reactive phosphorus,represented by monopotassium phosphate that leads to eutrophication of lake. Characteristics of monopotassium phosphate releasing and re-adsorption were experimentally studied with sediment samples taken from East Dongting Lake,onto which saturated inorganic reactive phosphorus was adsorbed, and laboratory tests simulated the laws of desorption and re-adsorbing of the sediment and experiment demonstrated that under disturbance condition, the equilibrium concentration of inorganic reactive phosphorus and desorption rate in aqueous phase were greater than those in static state; when the disturbance intensity was as big as 220 r/min,the aqueous phase equilibrium concentration of inorganic reactive phosphorus was 1.65 times that in static state and the desorption rate 6.46 times that in the static state;and during the rapid desorption stage when the system being disturbed,the desorption rate was positively correlated with sand content in the system. As for the re-adsorption of inorganic reactive phosphorus under disturbance state,the results showed it accorded with the Freundlich isotherm equation,yet as sand content continued to increase,the re-adsorbing equilibrium amount tended to decline. In addition,p H value in water greatly affected releasing of inorganic reactive phosphorus from the sediment saturated with adsorption inorganic reactive phosphorus,i.e.,releasing amount was the least when water being neutral,while lowering or raising p H value let the releasing amount increase.