五氯酚在土壤胶体界面的还原转化  

Reductive Transformation of Pentachlorophenol on the Interface of Subtropical Soil Colloids and Water

作　　者：王旭刚[1,2] 孙丽蓉[1] 曾芳[2] 李芳柏[2] 

机构地区：[1]河南科技大学农学院,河南洛阳471003 [2]广东省生态环境与土壤研究所,广东省农业环境综合治理重点实验室,广东广州510650

出　　处：《环境科学研究》2009年第4期438-443,共6页Research of Environmental Sciences

基　　金：国家自然科学基金项目(20577001);河南科技大学科研基金项目(09001270)

摘　　要：提取玄武岩发育的红壤胶体,用恒温厌氧平衡动力学方法,研究土壤胶体界面五氯酚的降解效果,以及外加Fe2+和草酸对五氯酚还原转化的影响.结果表明,厌氧条件下玄武岩发育赤红壤和砖红壤胶体对五氯酚均具有一定的降解能力,其表观降解速率常数分别为(0.032±0.002)和(0.057±0.003)d-1.草酸或Fe2+对土壤表面五氯酚的降解均有显著的促进作用.在探讨土壤胶体对五氯酚的降解能力与其理化性质关系的基础上,说明利用铁氧化物可进行复杂土壤体系中有机氯类污染物的修复.Latosol and latosolic red soil colloids were obtained from subtropical soil parent materials （basalt）. Effects of Fe-rich soil colloids and addition of Fe^2＋ or oxalic acid on reductive transformation of pentachlorophenol were studied in anoxic suspension through batch experiments at constant temperature. Results showed that PCP reductive transformation occurred with k values of （0.032 ± 0.002） and （0.057 ± 0.003） d^-1 in the presence of the latosolic red soil and latosol colloids, respectively. The enhancement of oxalic acid or Fe^2＋ on transformation of PCP was also observed. The relationship between soil mineralogical and physicochemical characters and the transformative capacity toward PGP suggested that iron oxides may be helpful to restore complex soil systems contaminated by organic chlorinated pollutants.

关 键 词：赤红壤 砖红壤 土壤胶体 五氯酚 还原转化 

分 类 号：X131.3[环境科学与工程—环境科学]