全氟和多氟烷基物质（PFASs）在热带土壤中的吸附行为。
Sorption behaviour of per- and polyfluoroalkyl substances (PFASs) in tropical soils.
机构信息
CSIRO Land and Water, Locked Bag 2, Glen Osmond, 5064, South Australia, Australia.
College of Science and Engineering, James Cook University, Cairns, 4878, Qld, Australia.
出版信息
Environ Pollut. 2020 Mar;258:113726. doi: 10.1016/j.envpol.2019.113726. Epub 2019 Dec 5.
The sorption behaviour of three perfluoroalkyl substances (PFASs), namely perfluorooctane sulfonic acid (PFOS), perfluorooctanoic acid (PFOA) and perfluorohexane sulfonic acid (PFHxS), was determined on 28 tropical soils. Tropical soils are often highly weathered, richer in sesquioxides than temperate soils and may contain variable charge minerals. There are little data on sorption of PFASs in tropical soils. The highest K values were found for PFOS with mean values ranging from 0 to 31.6 L/kg. The K values for PFOA and PFHxS ranged from 0 to 4.9 L/kg and from 0 to 5.6 L/kg, respectively. While these values are in the range of literature sorption data, the average K values for PFOS and PFOA from the literature were 3.7 times and 3.6 times higher, respectively, than those measured in this study. Stepwise regression analysis did explain some of the variance, but with different explanatory variables for the different PFASs. The main soil properties explaining sorption for PFOS and PFOA were oxalate-extractable Al and pH, and for PFHxS was pH.
三种全氟烷基物质（PFASs），即全氟辛烷磺酸（PFOS）、全氟辛酸（PFOA）和全氟己烷磺酸（PFHxS）在 28 种热带土壤上的吸附行为进行了测定。热带土壤通常风化程度较高，比温带土壤富含三氧化物，并且可能含有可变电荷矿物。关于 PFASs 在热带土壤中的吸附数据很少。PFOS 的 K 值最高，平均值范围为 0 至 31.6 L/kg。PFOA 和 PFHxS 的 K 值范围分别为 0 至 4.9 L/kg 和 0 至 5.6 L/kg。虽然这些值在文献中吸附数据的范围内，但文献中 PFOS 和 PFOA 的平均 K 值分别比本研究中测量的值高 3.7 倍和 3.6 倍。逐步回归分析确实解释了一些方差，但对于不同的 PFASs，解释变量不同。解释 PFOS 和 PFOA 吸附的主要土壤性质是草酸盐提取的 Al 和 pH，而对于 PFHxS，则是 pH。
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