氯酚类污染物在小麦幼苗中的竞争吸附研究  

Competitive Sorption of Chlorinated Phenols by Wheat Seedlings

作　　者：丰培娟[1] 陈甜甜[1] 石冬瑾[1] 邱宇平[1] 

机构地区：[1]浙江工业大学生物与环境工程学院,浙江杭州310032

出　　处：《环境科学与技术》2012年第2期34-38,共5页Environmental Science & Technology

基　　金：浙江省高等学校优秀青年教师计划资助(GK160810504)

摘　　要：极性有机污染物植物吸收行为的研究目前已有较多报道。文章将以小麦幼苗干样为研究对象,以2种氯酚(2,4-二氯酚,DCP;2,4,6-三氯酚,TCP)为吸附质,以菲(PHE)为非极性参照化合物,探讨竞争吸附条件下,可解离有机污染物的植物吸收行为。采用序批平衡实验分别研究了小麦幼苗干样干样对DCP、TCP、PHE单独吸附,及DCP或PHE共存影响下TCP的竞争吸附行为。结果表明,小麦幼苗干样对TCP、DCP和PHE各单组分的吸附呈显著线性相关,分配系数与类脂含量有关;TCP的解离作用使得TCP的类脂标化后植物-水分配系数对数值(logKlip)要小于其辛醇-水分配系数对数值(logKow);DCP或PHE的共存提升了小麦幼苗干样对TCP的吸附能力。TCP的存在不影响小麦幼苗干样对菲的吸附,却能影响其对DCP的吸附。Many studies have reported the sorption of polar organic pollutants by plants.Competitive sorption of ionizable organic pollutants by dry wheat seedlings in the presence of other organics were investigated,with 2,4-dichlorophenol（DCP）and 2,4,6-trichlorophenol（TCP）as the test pollutants and phenanthrene（PHE）as a nonionizable reference.Single solute sorption for DCP,TCP,PHE and bi-solute competitive sorption of TCP in the presence of DCP or PHE were determined by batch method.Results showed that the sorption of DCP,TCP,PHE as single solutes was characterized by linear isotherms and thus dominated by a partition process.Lipid-normalized plant-water partition coefficient of TCP was smaller than its octanol-water partition coefficient due to TCP ionization.The sorption of TCP was promoted when DCP or PHE coexisted.TCP did not affect the sorption of PHE but affected the sorption of DCP.

关 键 词：氯酚 小麦幼苗 竞争吸附 

分 类 号：X131.3[环境科学与工程—环境科学]