酸处理不同粒径土壤组分对菲的吸附研究

Adsorption of phenanthrene by acid treated soil components with different particle sizes

利用元素分析、红外光谱、比表面积分析和苯多羧酸生物标志物(BPCAs)等方法,研究了菲(PHE)在受人为干扰下的不同粒径土壤组分上的吸附特性,探讨了酸处理对不同粒径土壤组分吸附PHE的影响。结果表明:(1)与未耕作土壤相比,60年种植水稻土壤中除黏粒组分外,各粒径土壤组分对PHE的吸附量明显下降。(2)不同粒径土壤组分对PHE的吸附与其有机碳含量呈正相关,其中炭黑在粉粒组分中对PHE的吸附起重要作用。(3)相比于酸处理前,各粒径土壤组分在酸处理后对PHE的单点吸附系数大体增加,这归因于酸处理减少极性有机质,增加了线性吸附。这证实了人为扰动下不同粒径土壤对非极性有机污染物吸附特性的影响,也进一步验证了BPCAs对预测土壤吸附有机污染物的潜在应用。

In this paper,elemental analysis,infrared spectroscopy,specific surface area and benzene polycarboxylic acid biomarkers(BPCAs)were combined to study the adsorption characteristics of phenanthrophene(PHE)on soil components with different particle sizes under human disturbance,and the effect of acid treatment on the adsorption of PHE on soil components with different particle sizes was discussed.The results showed that:(1)compared with the uncultivated soil,the PHE adsorption capacity of soil components with all particle sizes in the 60-year rice planting soil decreased significantly,except for the clay fraction.(2)The adsorption of PHE on different soil components with different particle sizes was positively correlated with the content of organic matter,and carbon black played an important role in the adsorption of PHE in powder particles.(3)Compared with before acid treatment,the single point adsorption coefficient of PHE on soil components generally increased after acid treatment,which was attributed to the reduction of polar organic matter and the increase of linear adsorption.This study emphasized the influence of soil with different particle sizes on the nonpolar adsorption characteristics of organic pollutants under artificial disturbance,and further verified the potential of BPCAs in predicting adsorption of organic pollutants in soil.