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首页> 外文期刊>Environmental Science & Technology >Comparative sorption and desorption of benzo[a]pyrene and 3,4,3 ',4 '-tetrachlorobiphenyl in natural lake water containing dissolved organic matter
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Comparative sorption and desorption of benzo[a]pyrene and 3,4,3 ',4 '-tetrachlorobiphenyl in natural lake water containing dissolved organic matter

机译：含溶解有机物的天然湖水中苯并[a] py和3,4,3'，4'-四氯联苯的吸附和解吸比较

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摘要

The sorption and desorption of two model compounds, benzo[a]pyrene (BaP) and 3,4,3',4'-tetrachlorobiphenyl (TCBP), were studied in natural lake water with high dissolved organic matter (DOM) content using the equilibrium dialysis and Tenax extraction methods. The sorption of TCBP was lower and reached steady value more slowly than did BaP. Tenax extraction revealed at least two differently desorbing fractions for both model compounds, which also supported the conclusion that DOM-HOC associations may involve several mechanisms. The rapidly desorbing fraction may be attributed to freely dissolved and loosely sorbed compound, whereas the more strongly sorbed fraction may indicate the presence of specific binding sites. The data indicated that the association between hydrophobic organic contaminants (HOC) and DOM is not simply absorption that is solely driven by the lipophilicity of the sorbates. Although contact time had a rather negligible effect on the sorption of BaP, the proportion of desorption resistant fraction increased with time, whereas the desorption of TCBP was less affected by contact time. Steric factors may be the cause of the lower sorption and smaller desorption resistant fraction of TCBP. The results indicate potential differences in the behavior of PAHs and PCBs in the aquatic environment.
机译：在天然湖水中溶解有机物（DOM）含量高的情况下，研究了苯并[a] re（BaP）和3,4,3'，4'-四氯联苯（TCBP）这两种模型化合物的吸附和解吸。平衡透析和Tenax提取方法。 TCBP的吸附较低，达到稳定值的速度比BaP慢。 Tenax提取揭示了两种模型化合物的至少两个不同的解吸级分，这也支持DOM-HOC关联可能涉及多种机制的结论。快速解吸的馏分可归因于自由溶解和松散吸附的化合物，而吸附更强的馏分可表明存在特定的结合位点。数据表明，疏水性有机污染物（HOC）和DOM之间的关联不只是吸收，而吸收仅是由吸附物的亲脂性驱动的。尽管接触时间对BaP的吸附影响可忽略不计，但抗脱附率的比例随时间增加，而TCBP的脱附受接触时间的影响较小。立体因素可能是TCBP吸附力降低和抗解吸力分数降低的原因。结果表明，在水生环境中，PAHs和PCBs的行为存在潜在差异。

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