六氟环氧丙烷二聚酸对沉积物的吸附：生物地球化学意义和分析考虑,ACS Earth and Space Chemistry

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六氟环氧丙烷二聚酸对沉积物的吸附：生物地球化学意义和分析考虑
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2021-03-01 , DOI: 10.1021/acsearthspacechem.0c00323
Jennifer L. Harfmann ₁ , Kate Tito ₁ , Robert J. Kieber ₁ , G. Brooks Avery ₁ , Ralph N. Mead ₁ , Megumi S. Shimizu ₁ , Stephen A. Skrabal ₁

Affiliation

在十二周的时间序列内研究了六氟环氧丙烷二聚酸（HFPO-DA）在北卡罗来纳州东南部收集的经过HFPO-DA修正（添加了600 ng的加标）的淡水和河口潮汐沉积物的命运。在14天之内，淡水和河口沉积物的HFPO-DA浓度降低了40-59％。这种下降不能用生物降解来解释，因为在生物活性沉积物和高压灭菌沉积物之间，HFPO-DA的损失没有统计学上的显着差异，并且通过高分辨率质谱检测不到降解产物。当对沉积物进行更积极的萃取（用80:20的1M NaOH在甲醇/水中浸泡12小时）时，可以回收到2-3％的HFPO-DA，这表明HFPO-DA强烈吸附到沉积物上，而侵略性较低的PFAS沉积物提取方法仍未检测到。这项研究的结果表明，（1）PFAS沉积物的提取方法需要重新评估，尤其是随着替代化合物的不断合成和发现，以及（2）采用侵蚀性较小的提取方法的研究大大低估了水生沉积物中PFAS的污染。鉴于HFPO-DA具有抗生物降解性并具有很高的吸附亲和力，因此与以前所认为的相比，对于HFPO-DA和其他短链替代PFAS，水生沉积物可能是更重要的长期吸收源。尤其是随着替代化合物的不断合成和发现，以及（2）采用侵蚀性较小的萃取方法进行的研究大大低估了水生沉积物中PFAS的污染。鉴于HFPO-DA具有抗生物降解性并具有很高的吸附亲和力，因此与以前所认为的相比，对于HFPO-DA和其他短链替代PFAS，水生沉积物可能是更重要的长期吸收源。尤其是随着替代化合物的不断合成和发现，以及（2）采用侵蚀性较小的萃取方法进行的研究大大低估了水生沉积物中PFAS的污染。鉴于HFPO-DA具有抗生物降解性并具有很高的吸附亲和力，因此与以前所认为的相比，对于HFPO-DA和其他短链替代PFAS，水生沉积物可能是更重要的长期吸收源。

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Sorption of Hexafluoropropylene Oxide Dimer Acid to Sediments: Biogeochemical Implications and Analytical Considerations

The sedimentary fate of hexafluoropropylene oxide dimer acid (HFPO-DA) was investigated over a 12 week time series in HFPO-DA-amended (600 ng of spike addition) freshwater and estuarine tidal sediments collected in southeastern North Carolina. A 40–59% decrease in the concentration of HFPO-DA was observed within 14 days for freshwater and estuarine sediments. This decrease could not be explained by biological degradation because there were no statistically significant differences in HFPO-DA loss between bioactive and autoclaved sediments and no degradation products were detected via high-resolution mass spectrometry. An additional 2–3% of HFPO-DA was recovered when sediments were subjected to a more aggressive extraction (12 h soak with 80:20 1 M NaOH in methanol/water), suggesting that HFPO-DA sorbs strongly to sediments and remains undetected by less aggressive PFAS sediment extraction methods. Results of this study highlight that (1) PFAS sediment extraction methodologies need to be re-evaluated, particularly as alternative compounds continue to be synthesized and discovered, and (2) studies employing less aggressive extraction methodologies significantly underestimate PFAS contamination in aquatic sediments. Given that HFPO-DA is resistant to biological degradation and has a high sorption affinity, aquatic sediments may be a more significant long-term sink for HFPO-DA and other short-chain alternative PFAS than previously thought.

更新日期：2021-03-18

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