分配作用对沉积物吸附对硝基苯酚的贡献

研究了杭州东苕溪、西湖、运河(杭州段)和嘉兴南湖4个不同水体的18个沉积物对对硝基苯酚的吸附作用及机理.结果表明,分配作用在沉积物吸附对硝基苯酚的过程中占主导地位,其等温吸附曲线呈线性,吸附系数K与有机碳含量f_oc呈显著正相关(r=0.983).同一来源的沉积物,有机碳标化的分配系数Koc大致为常数.阳离子交换容量CEC对沉积物吸附对硝基苯酚几乎没有影响.

The contribution of distribution to sorption of p-nitrophenol into sediments.

The mechanisms of p-nitrophenol sorption into 18 sediments from four different water bodies are investigated in this paper. The results indicate that distribution plays a leading role in the process of sorption of p-nitrophenol into sediments; the sorption isotherms of p-nitrophenol are linear; the sorption coefficients are proportional to the organic carbon content of sediments (r=0.983); the distribution coefficients normalized by organic carbon content are almost constants for the sediments from same origin; and the cation exchange capacities of sediments have almost no influence to the sorption of p-nitrophenol.