土壤性质对其吸附短链全氟羧酸的影响

Influence of soil properties on the adsorption of short-chain perfluorocarboxylates onto soil

本文研究了土壤理化性质对其吸附短链全氟羧酸(PFCAs)的影响.研究结果表明, Freundlich和Virial吸附等温线均可对吸附数据进行较完美的拟合,相关系数(R^2)分别介于0.9651~0.9989和0.8670~0.9985.各种土壤性质与短链PFCAs固液分配系数(K_d)的线性回归分析结果表明,蛋白质含量、阴离子交换容量(AEC)、铁氧化物含量和黏粒含量是影响土壤吸附短链PFCAs的关键性因素;土壤总有机碳(TOC)、胡敏酸、富里酸、糖类、阳离子交换容量和比表面积等因素对吸附的影响并不显著.多元线性回归分析结果表明,土壤因素对其吸附短链PFCAs影响的重要程度依次为:AEC>蛋白质>黏粒含量>铁氧化物.

The influence of soil properties on the adsorption of short-chain perfluorocaboxylates(PFCAs) onto soil was investigated. The results showed that the adsorption data could be well described by both Freundlich and Virial isotherms as their correlation coefficients ranged from 0.9651 to 0.9989 and from 0.8670 to 0.9985, respectively. The linear regressions between individual soil property and distribution coefficient were conducted for determination of the dominant soil properties affecting the adsorption of short-chain PFCAs onto soil. The results indicated that the content of protein, anion exchange capacity(AEC), iron oxides and clay were the dominant soil properties, while there were no effects of the content of total organic carbon(TOC), humic acid, fulvic acid, saccharide, cation exchange capacity, and specific surface area on the adsorption. The results of multiple linear regression analysis showed that the importance of soil properties on the adsorption of short-chain PFCAs was according to the following orders, AEC>protein>clay>iron oxides.