水体中悬浮颗粒物对酞酸酯的吸附和解吸特性

选择水体中的悬浮颗粒物(SPM)--沉积颗粒物和浮游植物颗粒(铜绿微囊藻和普通小球藻),研究它们对邻苯二甲酸二丁酯(DBP)、邻苯二甲酸二异辛酯(DEHP)的吸附和解吸行为.结果表明,SPM对DBP 和DEHP的吸附在很短的时间内即可达到平衡,沉积颗粒物约为2h,浮游植物颗粒约为0.5h;SPM对DEHP的吸附能力明显大于DBP;不同SPM对同一种化合物的吸附能力差异较大,这与颗粒物中有机质的类型和结构有关;在实验浓度范围内,SPM对DBP和DEHP的吸附和解吸等温线具有较好的线性关系,解吸过程存在明显的迟滞现象,且沉积颗粒物比浮游植物颗粒物具有明显的迟滞效应,DBP比DEHP具有较大程度的迟滞效应.

CHARACTERISTIC OF SORPTION AND DESORPTION OF PHTHALATE ACID ESTERS ON SUSPENDED PARTICULATE MATTER IN LAKE WATER

Behaviors of sorption and desorption of dibutyl phthalate(DBP);Di-(2-ethyl)hexyl phthalate(DEHP) on two kinds of important suspended particulate matter(SPM),suspended sediment particulate and phytoplankton particulate,in lake water were investigated.The results showed that sorption equilibrium of DBP and DEHP on the SPM was reached quickly,2h for suspended sediment and 0.5h for phytoplankton,respectively.Sorption ability of DEHP on SPM was significantly higher than that of DBP.Sorption ability between the SPM for DBP or DEHP differed greatly.This is related to the property of organic matter in the SPM.All kiods of SPM wrer found to exhibit significant sorption-desorption hystersis phenomenin,and the extent of hystersis for suspended particulate was obviously larger than phytoplankton,and the extent of hystersis for DBP was larger than DEHP.