Biogeochemistry of butyltins in an enclosed marine ecosystem
Biogeochemistry of butyltins in an enclosed marine ecosystem
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封闭海洋生态系统中丁基锡的生物地球化学
DOI：
10.1021/es00077a012
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发表时间：
1990
影响因子：
11.4
通讯作者：
M. Pilson
中科院分区：
文献类型：
--
作者：
D. Adelman;K. Hinga;M. Pilson
三丁基锡（TBT）及其降解产物进行了研究，通过引入放射性标记的三丁基锡到一个13立方米的海洋围隔（MERL围隔）与近自然的水柱和底栖生物。对三丁基锡化合物及其降解产物进行了278天的监测。水柱中的三丁基锡化合物浓度（最初为590±20毫微克/升）在15天内以0.20天/升的速度下降，然后降至0.10天/升。大部分三丁基锡化合物通过生物降解从水体中流失，生物降解速率为0.08天。三分之二的降解是通过脱丁基作用生成二丁基锡（DBT），后者在约0.04天1时又降解为单丁基锡（MBT）。三分之一的TBT直接降解为MBT。没有证据表明MBT在水中发生降解。另一部分从水柱中去除的三丁基锡化合物被转移到沉积物中。沉积物中的三丁基锡化合物似乎没有明显降解。一部分三丁基锡化合物显然迅速转移到空气-水界面，然后从水箱中流失。
Tributyltin (TBT) and its degradation products were studied by introducing radiolabeled tributyltin into a 13-m3 marine enclosure (a MERL mesocosm) with near-natural water column and benthos. TBT and its degradation products were monitored for 278 days. TBT concentrations in the water column (initially 590±20 ng L'1) decreased at a rate of 0.20 day'1 for 15 days and then slowed to 0.10 day'1. Most TBT was lost from the water column through biodegradation, which occurred at a rate of 0.08 day'1. Two-thirds of the degradation proceeded through debutylation to dibutyltin (DBT), which in turn degraded to monobutyltin (MBT) at~ 0.04 day'1. One-third of the TBT was degraded directly to MBT. There was no evidence for degradation of MBT in the water. Another portion of the TBT removed from the water column was transported to sediments. TBT in the sediments did not appear to measurably degrade. A portion of the TBT was apparently transported rapidly to the air-water interface and then was lost from the tank.