Effects of particle size, organic matter and ionic strength on the phosphate sorption in different trophic lake sediments.
Effects of particle size, organic matter and ionic strength on the phosphate sorption in different trophic lake sediments.
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DOI：
10.1016/j.jhazmat.2005.07.048
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发表时间：
2006-02
影响因子：
13.6
通讯作者：
Shengrui Wang;X. Jin;Qingyun Bu;Xiao-ning Zhou;Fengchang Wu
中科院分区：
文献类型：
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作者：
Shengrui Wang;X. Jin;Qingyun Bu;Xiao-ning Zhou;Fengchang Wu
湖泊系统的营养状况和发育受到沉积物-水界面磷酸盐吸附的显着影响。本研究研究了有机物、颗粒尺寸和离子强度对沉积物吸附磷酸盐的影响。结果表明，对于所有研究的沉积物，最大磷酸盐吸附容量（Qmax）、平衡磷酸盐浓度（EPC0）、磷酸盐吸附效率（k）和磷酸盐吸附速率随着颗粒尺寸的增加而降低。但可靠解吸磷（RDP）增加。不同粒径级分的Qmax、EPC0、k和RDP各不相同，不同营养湖沉积物之间没有明显差异。随着湖泊沉积物污染程度的增加，Qmax、EPC0增大，k和RDP减小。磷酸盐的吸附主要发生在0.5h内。幂函数和简单的 Elovich 模型是不同粒径部分磷酸盐吸附的最佳动力学模型。随着沉积物有机质含量的降低和离子强度的增加，Qmax和磷酸盐吸附率降低。这项研究表明，离子强度和有机质对不同营养湖沉积物的磷酸盐吸附具有相似的影响。
The trophic status and development of lake system is significantly influenced by the phosphate sorption at the sediment–water interface. The effects of organic matter, particle size and ionic strength on the phosphate sorption by sediments were investigated in this study. The results show that maximum phosphate sorption capacity (Qmax), equilibrium phosphate concentration (EPC0), phosphate sorption efficiency (k) and phosphate sorption rate decreased as particle size increased for all the studied sediments. But the reliable desorbed phosphorus (RDP) increased. Qmax, EPC0, k and RDP of different particle size fractions varied and there were no obvious differences among different trophic lake sediments. Qmax, EPC0increased while k and RDP decreased as the pollution level of lake sediment increased. The phosphate sorption mainly occurred within 0.5h. Power function and simple Elovich models were the best kinetic models for the phosphate sorption of the different particle size fractions. Qmaxand phosphate sorption rate decreased with the decreasing of organic matter content of sediments and the increasing of ionic strength. This study suggests that ionic strength and organic matter had similar effects on the phosphate sorption for different trophic lake sediments.