Rates of Sorption and Partitioning of Contaminants in River Biofilm
详细信息 查看全文
- 作者：John V. Headley ; Juergen Gandrass ; Juergen Kuballa ; Kerry M. Peru ; and Yiling Gong
- 刊名：Environmental Science & Technology
- 出版年：1998
- 出版时间：December 15, 1998
- 年：1998
- 卷：32
- 期：24
- 页码：3968 - 3973
- 全文大小：113K
- 年卷期：v.32,no.24(December 15, 1998)
- ISSN：1520-5851
文摘
Biofilms are believed to play a significant role in the fateand transport of contaminants in aquatic environments.However little is known about the rates of sorption (k) andpartitioning (Kd) of contaminants to biofilms. Studies ofthe latter were performed using mature biofilm cultivatedin a roto-torque reactor. The reactor was flushed withriver water containing a mixture of tetrabutyltin, p,p-DDT,diclofop-methyl, triallate, lindane, atrazine, parathion-methyl, and dimethoate in two experiments. The firstexperiment was conducted at a spiked level of 1 
g/L, andthe second was conducted at 10 g/L for each component.Apart from dimethoate, there was rapid depletion of allcontaminants from the water phase within the first 5-10min with sorption occurring by pseudo-first-order kinetics.In general, the mean values of k (10-4 min-1) increasedwith water solubility and were 8, 70, 110, 180, 230, 370, and100 for p,p-DDT, diclofop-methyl, triallate, tetrabutyltin,lindane, atrazine, and parathion-methyl, respectively. Thevalues of log Kd increased linearly with log Kow anddecreased linearly with the log of the aqueous solubilities.In general, Kow values were significantly greater thanthe corresponding values of Kd, indicating that partitioningof contaminants was not limited to lipophilic regions ofthe biofilm.
g/L, andthe second was conducted at 10 g/L for each component.Apart from dimethoate, there was rapid depletion of allcontaminants from the water phase within the first 5-10min with sorption occurring by pseudo-first-order kinetics.In general, the mean values of k (10-4 min-1) increasedwith water solubility and were 8, 70, 110, 180, 230, 370, and100 for p,p-DDT, diclofop-methyl, triallate, tetrabutyltin,lindane, atrazine, and parathion-methyl, respectively. Thevalues of log Kd increased linearly with log Kow anddecreased linearly with the log of the aqueous solubilities.In general, Kow values were significantly greater thanthe corresponding values of Kd, indicating that partitioningof contaminants was not limited to lipophilic regions ofthe biofilm.