Future Industries Institute, University of South Australia, Adelaide, Australia.
Future Industries Institute, University of South Australia, Adelaide, Australia.
Environ Pollut. 2022 Aug 15;307:119498. doi: 10.1016/j.envpol.2022.119498. Epub 2022 May 23.
In this study, changes in PFAS leachability and bioavailability were determined following the application of RemBind®100 (R100) and RemBind®300 (R300; 1-10% w/w) to PFAS-contaminated soil (Ʃ PFAS 3.093-32.78 mg kg). Small differences were observed in PFAS immobilization efficacy when soil was amended with RemBind® products although adding 5% w/w of either product resulted in a >98% reduction in ASLP PFAS leachability. Variability in immobilization efficacy was attributed to differences in activated carbon composition which influenced physicochemical properties of RemBind® formulations and PFAS sorption. PFOS, PFHxS and PFOA relative bioavailability was also assessed in unamended and amended soil (5% w/w) using an in vivo mouse model. In unamended soil, PFAS relative bioavailability was >60% with differences attributed to physicochemical properties of soil which influenced electrostatic and hydrophobic interactions. However, when PFAS relative bioavailability was assessed in soil amended with 5% w/w R100, individual PFAS relative bioavailability was reduced to 16.1 ± 0.8% to 26.1 ± 0.9% with similar results observed when R300 (5% w/w) was utilised (14.4 ± 1.6% to 24.3 ± 0.8%). Results from this study highlight that soil amendments have the potential to reduce both PFAS leachability and relative bioavailability thereby decreasing mobility and potential exposure to soil-borne contaminants.
在这项研究中，确定了将 RemBind®100（R100）和 RemBind®300（R300；1-10%w/w）应用于受全氟辛烷磺酸（PFAS）污染的土壤（∑PFAS 3.093-32.78mgkg）后，PFAS 浸出性和生物可利用性的变化。尽管添加 5%w/w 的任一种产品都导致 ASLP PFAS 浸出性降低>98%，但在土壤中添加 RemBind®产品时，PFAS 固定效果的差异很小。固定效率的可变性归因于活性炭成分的差异，这影响了 RemBind®制剂和 PFAS 吸附的物理化学性质。还使用体内小鼠模型评估了未添加和添加（5%w/w）RemBind®产品的土壤中 PFOS、PFHxS 和 PFOA 的相对生物可利用性。在未添加的土壤中，PFAS 的相对生物可利用性>60%，差异归因于影响静电和疏水性相互作用的土壤物理化学性质。然而，当评估添加 5%w/w R100 的土壤中 PFAS 的相对生物可利用性时，个别 PFAS 的相对生物可利用性降低至 16.1±0.8%至 26.1±0.9%，当使用 R300（5%w/w）时观察到类似的结果（14.4±1.6%至 24.3±0.8%）。本研究的结果表明，土壤改良剂具有降低 PFAS 浸出性和相对生物可利用性的潜力，从而降低了土壤中污染物的迁移性和潜在暴露。
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