School of Agriculture, Food and Wine, Faculty of Sciences, The University of Adelaide, PMB 1 Waite Campus, Glen Osmond, South Australia, Australia; Commonwealth Scientific and Industrial Research Organisation, PMB 2 Land and Water, Waite Campus, South Australia, Australia.
Queensland Alliance for Environmental Health Sciences, The University of Queensland, 20 Cornwall Street, Woolloongabba, Queensland, Australia.
J Hazard Mater. 2021 Feb 15;404(Pt B):124065. doi: 10.1016/j.jhazmat.2020.124065. Epub 2020 Oct 1.
This study investigated the potential aging and plant bioaccumulation of three perfluoroalkyl acids (PFAAs), perfluorosulphonic acid (PFOS), perfluorooctanoic acid (PFOA) and perfluorohexanesulphonic acid (PFHxS) in 20 soils over a six-month period. Sorption coefficients (Log K) ranged from 0.13-1.28 for PFHxS, 0.17-1.06 for PFOA and 0.98-2.03 for PFOS, respectively, and bioaccumulation factors (Log BAFs) ranged from 0.29-1.24, 0.22-1.46 and 0.05-0.65 for PFHxS, PFOA and PFOS, respectively. Over the six-month period, K values significantly increased for PFHxS and PFOA but the magnitude of the increase was very small and did not translate into differences in plant PFAA-concentrations between aged and freshly spiked treatments. The K and BAF values were modelled by multiple linear regression (MLR) to soil physico-chemical properties and by partial least squares regression to soil spectra acquired by mid-infrared spectroscopy (DRIFT-PLSR). Modelling of each PFAA was influenced by different soil properties, including organic carbon, pH, CEC, exchangeable cations (Ca, Mg, Na and K) and oxalate extractable Al. BAF values were not strongly correlated to any soil property but were inversely correlated to K values. Our results indicate that limited aging occurred in these soils over the six-month period.
本研究在六个月的时间内调查了三种全氟烷基酸（PFAAs），即全氟磺酸（PFOS）、全氟辛酸（PFOA）和全氟己烷磺酸（PFHxS）在 20 种土壤中的潜在老化和植物生物累积情况。吸附系数（Log K）范围分别为 PFHxS 的 0.13-1.28、PFOA 的 0.17-1.06 和 PFOS 的 0.98-2.03，生物累积因子（Log BAFs）范围分别为 PFHxS 的 0.29-1.24、PFOA 的 0.22-1.46 和 PFOS 的 0.05-0.65。在六个月的时间里，PFHxS 和 PFOA 的 K 值显著增加，但增加幅度非常小，并且不会导致老化和新添加处理之间植物中 PFAAs 浓度的差异。通过多元线性回归（MLR）对土壤理化性质和中红外光谱（DRIFT-PLSR）获得的土壤光谱对 K 和 BAF 值进行建模。每种 PFAAs 的建模都受到不同土壤性质的影响，包括有机碳、pH、CEC、可交换阳离子（Ca、Mg、Na 和 K）和草酸盐提取的 Al。BAF 值与任何土壤性质都没有很强的相关性，但与 K 值呈负相关。我们的结果表明，在六个月的时间里，这些土壤中的老化现象有限。
