Bioavailability of sorbed phenanthrene and permethrin in sediments to Chironomus tentans
Bioavailability of sorbed phenanthrene and permethrin in sediments to Chironomus tentans
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DOI：
10.1016/j.aquatox.2010.01.016
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发表时间：
2010-06-01
影响因子：
4.5
通讯作者：
Gan, Jay
中科院分区：
文献类型：
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作者：
Cui, Xinyi;Hunter, Wesley;Gan, Jay
吸附的疏水有机污染物（HOCs）的底栖生物的可用性是重要的特征沉积物毒性。虽然许多研究表明，快速解吸HOC池与底栖生物的生物利用度之间存在相关性，但对缓慢或非常缓慢解吸部分的生物利用度仍然知之甚少。在这项研究中，摇蚊tentans暴露于菲（PHE）或氯菊酯（PM），以获得生物群沉积物积累因子（BSAFs）在沉积物中依次解吸与Tenax提取或修改与木炭之间的快速（f（快速）），缓慢（f（缓慢））和非常缓慢（f（vslow））解吸池的PHE和PM的分布。随着解吸间隔的增加，f（快速）迅速下降到零，并成为可以忽略不计后，12小时的解吸菲和48小时的解吸PM。然而，在f（快速）耗尽的样品中，BSAF值远大于零，表明f（缓慢）和f（缓慢）的可用性。多元线性回归模型进一步用于估计不同解吸池的BSAF，即，BSAF（快速）、BSAF（慢速）或BSAF（慢速）。缓慢解吸池被发现是容易利用的C。tentans，BSAF（慢）值范围为BSAF（快）的25.3%至73.9%。相比之下，BSAF（vslow）的范围为BSAF（rapid）的0 - 5.9%，表明缺乏可用性。因此，动力学慢解吸组分是相对生物有效的，不应被忽视的沉积物毒性评价。(c)2010 Elsevier B. V.保留所有权利。
The availability of sorbed hydrophobic organic contaminants (HOCs) to benthic organisms is important for characterizing sediment toxicity. While many studies show a correlation between the rapid desorption HOC pool and bioavailability to benthic organisms, bioavailability of the slow or very slow desorption fraction is still poorly understood. In this study, Chironomus tentans were exposed to phenanthrene (PHE) or permethrin (PM) to derive biota-sediment accumulation factors (BSAFs) in a sediment that was sequentially desorbed with Tenax extraction or amended with a charcoal to modify the distribution of PHE and PM among the rapid (f(rapid)), slow (f(slow)) and very slow (f(vslow)) desorption pools. As the desorption interval was increased, the f(rapid) quickly decreased to zero and became negligible after 12 h desorption for PHE and 48 h desorption for PM. However, in samples with depleted f(rapid), BSAF values were substantially greater than zero, suggesting availability of f(slow) and f(slow). A multivariate linear regression model was further used to estimate BSAFs specific to the different desorption pools, i.e., BSAF(rapid), BSAF(slow), or BSAF(vslow). The slow desorption pool was found to be readily available to C. tentans, with BSAF(slow) values ranging from 25.3 to 73.9% of BSAF(rapid). In comparison, BSAF(vslow) ranged from 0 to 5.9% of BSAF(rapid), suggesting a lack of availability. Therefore, the kinetically slow desorption fraction is relatively bioavailable and should not be ignored in sediment toxicity assessment. (c) 2010 Elsevier B.V. All rights reserved.