摘要
利用向海湿地河道上、下游土壤样品进行了吸附铅、镉的热力学实验,结果表明土壤样品吸附铅、镉的过程符合Langmuir和Freundlich等温吸附曲线(n=8,p=0.01),吸附铅的能力约是吸附镉能力的一个数量级,下游断面土壤样品吸附铅、镉的能力明显大于上游断面,且土壤样品吸附铅、镉的最大吸附量与土壤中的细粒土壤、有机质和铁、锰氧化物含量存在显著的相关性,即土壤样品的理化性质是影响土壤吸附铅、镉能力的主要因素;同时,根据向海湿地河道上、下游土壤样品理化性质的差异,可以推测向海湿地净化污染物功能在逐渐减弱。
The adsorption of Pb and Cd to the soils sampled along the riverbank upstream and downstream in Xianghai wetland was investigated. The experimental results show that the adsorption of Pb and Cd onto wetland soils could be described using Langmuir and Fruendlich isotherms with the correlation coefficient significant at the confidence level of p=0.01(n=8). The maximum adsorption of Pb is almost an order of magnitude greater than that of Cd and the adsorption capacities of Pb and Cd to the downstream soils are greater than those of upstream soils. The correlation analyses indicate that the maximum adsorption of Pb and Cd increases with increasing in the contents of fine soil particles, TOC, and Fe, Mn oxides in the soils with significant correlation at the confidence level of p=0.10(n≥8), implying that the soil characteristics, such as fine soil particles, TOC, and Fe, Mn oxides in the soils, are important factors affecting adsorption of Pb and Cd to wetland soils. It is concluded that the filter function for pollutants in Xianghai wetland is getting worse.
出处
《水土保持学报》
CSCD
北大核心
2003年第4期58-60,74,共4页
Journal of Soil and Water Conservation
基金
国家自然科学基金重点项目(批准号:50139020)资助
