汉江下游武汉段河漫滩沉积物吸附磷的特征

研究了汉江下游武汉段河漫滩7个沉积物的吸附特征及温度和扰动强度对磷吸附等温线的影响，用改进的Langmuir模型和Freundlish模型对实验吸附数据进行拟合，可得到最大吸附容量（Qmax）、原有吸附可交换态磷（NAP）、临界磷平衡浓度（EPC0）和固-液分配系数（Kp）的值．结果表明，改进的Langmuir模型更适用于描述汉江河漫滩沉积物的吸附特征，其物理意义更明确；Kp与Qmax呈较好的线性关系；沉积物吸附和解吸磷能力与温度变化一致；沉积物在等温吸附磷过程中，固体浓度效应在强扰动强度（200r／min）时最强。弱扰动强度（150r／min）时次之，中扰动强度（100r／min）时最弱．

Adsorption Characters of Phosphorus by Floodplain Sediments from the Lower Reaches (River Section in Wuhan City) of Hanjiang River

The adsorption characters of phosphorus on the 7 floodplain sediments collected in the lower reaches of the Hanjiang River were determined in laboratory,and the effects of temperature and disturbance on phosphorus adsorption isotherms were also researched.The improved Langmuir model and the Freundlish model were used to describe phosphorus adsorption properties on the sediments.The values of the maximum sorption capacity(Q_(max)),native phosphorus polluted(NAP-polluted) content,zero equilibrium phosphorus concentration(EPC_(0)) value and partitioning coefficient(K_p) were attained.The results showed that the improved Langmuir model was fitter for describing phosphorus adsorption on floodplain sediments compared with Freundlish model in the experiment.The correlation between Q_(max) and K_(p) was described well by linear equation and phosphorus adsorption or desorption capacity was weak at lower temperature.Particle concentration effect was strongest at strong disturbance(200 r/min) and was weakest at medium disturbance(150 r/min).Particle concentration effect took second place at weak disturbance(100 r/min).