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在室内模拟扰动条件下,研究了桑沟湾养殖水域表层沉积物对磷酸盐的吸附动力学及其吸附等温线,探讨了磷酸盐的吸附-解吸平衡质量浓度以及沉积物的源汇角色.结果表明,沉积物对磷酸盐的吸附主要发生在0~0.5 h,吸附平衡时间约为6h,吸附动力学方程符合修正的Elovich模型,回归方程为:Q=85.536+35.512 lnt(R2=0.960 2);低浓度条件下沉积物对磷酸盐的吸附等温线呈线性,线性方程为:Q=265.04ce-7.46(R2=0.965),高浓度条件下沉积物对磷酸盐的吸附等温线符合Langmuir模型(R2=0.989);沉积物中本底吸附态磷为7.46μg/g,对磷的最大吸附量Qmax为769.23μg/g;沉积物对磷酸盐的吸附-解吸平衡质量浓度EPC0为0.028 mg/L,结合该区域水体磷酸盐含量情况,初步推断该区域的沉积物大多数时间充当的是磷源的角色.
Under the conditions of indoor disturbance, the adsorption kinetics and adsorption isotherm of phosphates on the surface sediments of the aquaculture waters in Sanggou Bay were studied, and the adsorption-desorption equilibrium mass concentration of phosphate and the source role of sediments were discussed. The results showed that the adsorption of phosphate on sediments occurred mainly from 0 to 0.5 h and the adsorption equilibrium time was about 6 h. The adsorption kinetics equation was in accordance with the modified Elovich model. The regression equation was: Q = 85.536 + 35.512 lnt (R2 = 0.960 2) . The adsorption isotherms of sediments to phosphate were linear under low concentration conditions. The linear equation was: Q = 265.04ce-7.46 (R2 = 0.965). The adsorption isotherms of sediments to phosphate accorded with Langmuir model R2 = 0.989). The content of phosphorus in the sediment was 7.46μg / g and the maximum adsorption capacity of phosphorus was 769.23μg / g. The adsorption-desorption equilibrium mass concentration (EPC0) of sediment was 0.028 mg / L Based on the phosphate content of the water bodies in this area, it is preliminarily concluded that the sediments in this area act as phosphorus sources most of the time.