Effects of transient flow conditions on colloid-facilitated release of decabromodiphenyl ether:Implications for contaminant mobility at e-waste recycling sites

作     者：Yueyue Li Zebin Huo Yuqin Ying Lin Duan Chuanjia Jiang Wei Chen 

作者机构：College of Environmental Science and EngineeringMinistry of Education Key Laboratory of Pollution Processes and Environmental CriteriaTianjin Key Laboratory of Environmental Remediation and Pollution ControlNankai UniversityTianjin 300350China 

出 版 物：《Eco-Environment & Health》 (生态环境与健康（英文）)

年 卷 期：2024年第3卷第3期

页      面：317-324页

学科分类：12[管理学] 1204[管理学-公共管理] 120402[管理学-社会医学与卫生事业管理(可授管理学、医学学位)] 1004[医学-公共卫生与预防医学(可授医学、理学学位)] 10[医学] 

基　　金：supported by the National Key Research and Development Program of China(2019YFC1804202) the National Natural Science Foundation of China(22276101 and 22020102004) the Fundamental Research Funds for the Central Universities(63233056) the Ministry of Education of China(T2017002) 

主　　题：Hydrophobic organic contaminants Colloid-facilitated transport Dry-wet cycle Freeze-thaw cycle Undisturbed soil core 

摘      要：Polybrominated diphenyl ethers(PBDEs)are ubiquitous contaminants,especially in the soil and groundwater of contaminated sites and ***,2,20,3,30,4,40,5,50,6,60-decabromodiphenyl ether(BDE-209),one of the most frequently and abundantly detected PBDE congeners in the environment,has recently been designated as a new pollutant subject to rigorous control in ***-facilitated transport is a key mechanism for the release of PBDEs from surface soils and their migration in the aquifer,but the effects of hydrodynamic conditions,particularly transient flow,on colloid-facilitated release of PBDEs are not well ***,we examined the effects of typical transient flow conditions on the release characteristics of colloids and BDE-209 from surface soil collected from an e-waste recycling site by undisturbed soil core leaching tests involving multiple dry–wet cycles(with different drying durations)and freeze–thaw *** observed significant positive correlations between BDE-209 and colloid concentrations in the leachate in both the dry–wet and freeze–thaw leaching experiments,highlighting the critical role of colloids in facilitating BDE-209 ***,colloids mobilized during the dry–wet cycles contained higher contents of BDE-209 than those in the freeze–thaw cycle tests,and the difference was primarily due to the more intensive disintegration of soil aggregates and elution of newly formed inorganic colloidal particles(mainly primary silicate minerals such as quartz and albite)with low BDE-209 content during the freeze–thaw *** findings underscore the necessity of considering transient flow conditions when assessing the fate and risks of PBDEs at contaminated sites.