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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Water Solubility Enhancement Effects of Some Polychlorinated Organic Pollutants by Dissolved Organic Carbon from a Soil with a Higher Organic Carbon Content
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Water Solubility Enhancement Effects of Some Polychlorinated Organic Pollutants by Dissolved Organic Carbon from a Soil with a Higher Organic Carbon Content

机译：有机碳含量较高的土壤中溶解的有机碳对某些多氯代有机污染物的水溶性增强作用

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摘要

To elucidate the role of a soil humic acid (HA) in the transport of polychlorinated organic pollutants (PCOPs), such as polychlorinated dibenzo-p-dioxins, polychlorinated diben-zofurans and coplanar-polychlorinated biphenyls, their partition coefficients (K_(doc)) into an HA were compared with their adsorption coefficients (K_(OC)) for a soil with a higher organic carbon (OC) content. The soil sample (ando soil) used in the present study was collected in the same location as the HA. The log K_(doc) values were positively correlated with logarithm of octanol-water partition coefficients (log K_(OW)) of the PCOPs, indicating that the partitioning of PCOPs into the HA was mainly due to hydrophobic interactions. However, the correlation between log K_(doc) and log K_(OC) was negative. This can be attributed to the enhanced water solubility of the PCOPs as the result of the dissolved organic matter from the soil. That is, when the more hydrophobic PCOPs with higher log K_(OW) values are partitioned into the HA, then the larger quantities of PCOPs that are partitioned into the HA are able to dissolve in the aqueous phase. These results suggest that, in a soil with a higher OC content, the HA can serve as more effective carrier of PCOPs from the soil to an aquatic environment.
机译：阐明土壤腐殖酸（HA）在多氯代有机污染物（PCOP）（例如多氯代二苯并对二恶英，多氯代二苯并呋喃和共平面多氯代联苯）的运输中的作用，它们的分配系数（K_（doc）） ）与高有机碳（OC）含量的土壤的吸附系数（K_（OC））进行比较。本研究中使用的土壤样品（安多土壤）是在与HA相同的位置收集的。 log K_（doc）值与PCOP的辛醇-水分配系数的对数（log K_（OW））正相关，表明PCOPs进入HA的分配主要是由于疏水相互作用。但是，log K_（doc）和log K_（OC）之间的相关为负。这可以归因于PCOP的水溶性增强，这是土壤中溶解的有机物的结果。即，当具有较高log K_（OW）值的疏水性更高的PCOP被分配到HA中时，被分配到HA中的大量PCOP便能够溶解在水相中。这些结果表明，在OC含量较高的土壤中，HA可以作为从土壤到水生环境的更有效的PCOP载体。

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