Sorption kinetic characteristics of polybrominated diphenyl ethers on natural soils |
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Authors: | Wenxin Liu Weibo Li Xi Ling Jianglin Chen |
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Institution: | a Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China b Department of Plant, Soil and Insect Sciences, University of Massachusetts, Amherst, MA 01003, USA c North China Sea Standard and Metrology Center of State Oceanic Administration (SOA), Qingdao 266033, China |
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Abstract: | 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. |
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Keywords: | BDE-28 BDE-47 Soil sorption Kinetics |
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