辽河沉积物中磷的等温吸附研究

Study on the adsorption of phosphorus in the sediments taken from LiaoHe river

分别在高、低浓度条件下,通过辽河干流五个采样点(红庙子、福德店、盘锦兴安、马虎山、鲁家大桥)的表层沉积物中磷吸附的实验,研究沉积物中磷的等温吸附。结果表明:在较高浓度条件下,辽河表层沉积物对磷的吸附既能很好地符合Freundlich等温式又能很好地符合Langmuir等温式。马虎山采样点的最大吸附量、吸附常数和最大缓冲容量在各采样点中都是最大的,说明马虎山采样点的沉积物对磷的吸附能力最强。在低浓度条件下,辽河沉积物对磷的吸附等温线符合Linear模型,各采样点对磷的吸附效率相差不大,其吸附-解析平衡浓度范围为0.1143mg/l^0.1233mg/l,各点均高于上覆水中磷的浓度,存在向上覆水中释放磷的趋势。

The adsorption of phosphorus on five samples of sediments taken from LiaoHe river at high and low concentration were studied. The results indicated that The phosphate adsorption isotherms on sediment from LiaoHe river accord with the Langmnir isotherm as well as the Freundlish isotherm in the high initial phosphorus concentration The Qmax, K and K·Qmax is higher than the else samples, it indicated that the sediment of the Mahushan has the stronger phosphate adsorption ability. The phosphate adsorption isotherms on sediment from LiaoHe were fitted by linear model in low initial phosphorus concentration. The phosphorus adsorption-desorption equilibrium concentration is from 0.1143mg/l^0.1233mg/l. It was higher than the phosphorus concentration in the overlying water, the possibility of phosphorus release is high.