title: Desorption behaviors of BDE-28 and BDE-47 from natural soils with different organic carbon contents.
abstract: Desorption kinetic and isothermal characteristics of BDE-28 and BDE-47 were investigated using natural soils with different organic carbon fractions. The results indicated that a two-compartment first-order model with dominant contribution of slow desorption could adequately describe the released kinetics of studied PBDEs. Desorption isotherms of different samples could be fitted well by linear distribution model or nonlinear Freundlich model. Moreover, most desorption procedures roughly exhibited hysteresis with respect to preceding sorption ones. At the statistically significant level of 0.05 or 0.1, total organic carbon content (f(OC)) exhibited significant correlations with the fitted parameters by the isothermal models. The correlations of f(OC) and SOM fractions (e.g., fulvic acid and humin) with the single point desorption coefficients at lower aqueous concentrations of studied PBDEs were significant; while at higher aqueous concentrations, the relationships were less significant or insignificant. Our findings may facilitate a comprehensive understanding on behaviors of PBDEs in soil systems.
authors.affiliation: Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China. wxliu@urban.pku.edu.cn
authors.forename: WenXin
authors.initials: W
authors.lastname: Liu
authors.forename: FangFang
authors.initials: F
authors.lastname: Cheng
authors.forename: WeiBo
authors.initials: W
authors.lastname: Li
authors.forename: BaoShan
authors.initials: B
authors.lastname: Xing
authors.forename: Shu
authors.initials: S
authors.lastname: Tao
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D052918:Environmental Restoration and Remediation; D055768:Halogenated Diphenyl Ethers; D007700:Kinetics; D008956:Models, Chemical; D011075:Polybrominated Biphenyls / Q000032:analysis / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry*
chemical_list: D055768:Halogenated Diphenyl Ethers; D011075:Polybrominated Biphenyls; D012987:Soil; D012989:Soil Pollutants; C511295:2,2',4,4'-tetrabromodiphenyl ether; D002244:Carbon; C533760:tribromodiphenyl ether 28