Sorption kinetic characteristics of polybrominated diphenyl ethers on natural soils.
Sorption kinetic characteristics of BDE-28 and BDE-47 on five natural soils with different organic carbon fractions were investigated, and could be satisfactorily described by a two (fast and slow)-compartment first-order model with the ratio of rate constants ranged from 9 to 94 times. The fast compartment made a dominant contribution (71%-94%) to the total sorption amount in the whole process, and accounted for over 90% of the increase in the total sorption amount at initial 5 h. The influence of the slow compartment on the increase in the total sorption amount became principal (above 90%) in the subsequent stage approximately from 9 h or 25 h to the apparent equilibrium at 265 h. The results proposed the different sorption behaviors of the mathematically classified compartments for BDE-28 and BDE-47, which may correspond to the different soil components, such as soil organic fractions with amorphous and condensed structures, respectively.
Liu
Wenxin
W
Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China. wxliu@urban.pku.edu.cn
Li
Weibo
W
Hu
Jing
J
Ling
Xi
X
Xing
Baoshan
B
Chen
Jianglin
J
Tao
Shu
S
D000042:Absorption; D000327:Adsorption; D055768:Halogenated Diphenyl Ethers; D007700:Kinetics; D008956:Models, Chemical; D011075:Polybrominated Biphenyls / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*
D055768:Halogenated Diphenyl Ethers; D011075:Polybrominated Biphenyls; D012989:Soil Pollutants; C511295:2,2',4,4'-tetrabromodiphenyl ether; C533760:tribromodiphenyl ether 28