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首页> 外文OA文献 >Combining Leaching and Passive Sampling To Measure the Mobility and Distribution between Porewater, DOC, and Colloids of Native Oxy-PAHs, N-PACs, and PAHs in Historically Contaminated Soil
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Combining Leaching and Passive Sampling To Measure the Mobility and Distribution between Porewater, DOC, and Colloids of Native Oxy-PAHs, N-PACs, and PAHs in Historically Contaminated Soil

机译：结合淋洗和被动采样来测量历史污染土壤中天然氧-PAH，N-PAC和PAH的孔隙水，DOC和胶体之间的迁移率和分布

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Different methods to quantify soil porewater concentrations of contaminants will provide different types of information. Passive sampling measurements give freely dissolved porewater concentrations (C-pw,C-free), while leaching tests provide information on the mobile concentration (C-pw,C-leach), including contaminants associated with dissolved organic carbon (DOC) and particles/colloids in the porewater. This study presents a novel combination of these two measurements, to study the sorption and mobility of polycyclic aromatic compounds (PACs) to DOC and particulate organic carbon (POC) in 10 historically contaminated soils. The PACs investigated were polycyclic aromatic hydrocarbons (PAHs), oxygenated-PAHs, and nitrogen containing heterocyclic PACs. Observed C-pw,C-leach was up to 5 orders of magnitude higher than C-pw,C-free; implying large biases when C-pw,C-leach is used to assess bioavailability or soil partitioning. Sorption of PACs to DOC and POC was important for the mobility of compounds with log K-OW > 4. Average DOC/water-partitioning coefficients (K-DOC) correlated well with KOW (log K-DOC = 0.89 x log K-OW +1.03 (r(2) = 0.89)). This relationship is likely more accurate for historically contaminated soils than previously published data, which suffer from artifacts caused by problems in measuring C-pw,C-free correctly or not using historically contaminated soils. POC/water-partitioning coefficients (K-POC) were orders of magnitude larger than corresponding K-DOC, suggesting sorption to mobile particles/colloids is the dominant mechanism for PAC mobility.
机译：量化土壤孔隙水中污染物浓度的不同方法将提供不同类型的信息。被动采样测量可提供自由溶解的孔隙水浓度（C-pw，无C），而浸出测试可提供有关移动浓度（C-pw，C-浸出）的信息，包括与溶解有机碳（DOC）和颗粒/孔隙水中的胶体。这项研究提出了这两种测量方法的新颖组合，以研究10种历史污染土壤中多环芳族化合物（PAC）对DOC和颗粒有机碳（POC）的吸附和迁移。研究的PAC是多环芳烃（PAH），氧化的PAH和含氮杂环PAC。观察到的C-pw，C浸出比C-pw，无C的浸出高5个数量级;当使用C-pw，C-leach评估生物利用度或土壤分配时，意味着存在较大偏差。 PAC对DOC和POC的吸附对于log K-OW> 4的化合物的迁移性很重要。平均DOC /水分配系数（K-DOC）与KOW密切相关（log K-DOC = 0.89 x log K-OW +1.03（r（2）= 0.89））。对于历史污染的土壤，这种关系可能比以前发布的数据更准确，后者会因正确测量C-pw，无C的问题或不使用历史污染的土壤而引起的假象。 POC /水分配系数（K-POC）比相应的K-DOC大几个数量级，表明对移动性颗粒/胶体的吸附是PAC迁移的主要机制。

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