首页|Soil colloids can significantly enhance spreading of polybromodiphenyl ethers in groundwater by serving as an effective carrier
Soil colloids can significantly enhance spreading of polybromodiphenyl ethers in groundwater by serving as an effective carrier
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Soil colloids can significantly enhance spreading of polybromodiphenyl ethers in groundwater by serving as an effective carrier
Polybromodiphenyl ethers(PBDEs),the widely used flame retardants,are common contam-inants in surface soils at e-waste recycling sites.The association of PBDEs with soil colloids has been observed,indicating the potential risk to groundwater due to colloid-facilitated transport.However,the extent to which soil colloids may enhance the spreading of PBDEs in groundwater is largely unknown.Herein,we report the co-transport of decabromodiphenyl ester(BDE-209)and soil colloids in saturated porous media.The colloids released from a soil sample collected at an e-waste recycling site in Tianjin,China,contain high concentration of PBDEs,with BDE-209 being the most abundant conger(320±30 mg/kg).The colloids exhibit relatively high mobility in saturated sand columns,under conditions commonly observed in groundwater environments.Notably,under all the tested conditions(i.e.,varying flow ve-locity,pH,ionic species and ionic strength),the mass of eluted BDE-209 correlates linearly with that of eluted soil colloids,even though the mobility of the colloids varies markedly depending on the specific hydrodynamic and solution chemistry conditions involved.Addi-tionally,the mass of BDE-209 retained in the columns also correlates strongly with the mass of retained colloids.Apparently,the PBDEs remain bound to soil colloids during transport in porous media.Findings in this study indicate that soil colloids may significantly promote the transport of PBDEs in groundwater by serving as an effective carrier.This might be the reason why the highly insoluble and adsorptive PBDEs are found in groundwater at some PBDE-contaminated sites.
Polybromodiphenyl ethersSoil colloidsE-waste recycling sitesGroundwaterFacilitated transport
Lin Duan、Min Li、Jiameng Liu、Wei Chen
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College of Environmental Science and Engineering,Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria,Tianjin Key Laboratory of Environmental Remediation and Pollution Control,Nankai University,Tianjin 300350,China
Polybromodiphenyl ethers Soil colloids E-waste recycling sites Groundwater Facilitated transport
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