The disappearance kinetics of fenhexamid in sterile and non-sterile conditions, as revealed by a mixed-effects model analysis

Pantani, Ottorino‐Luca; Lozzi, Irene; Calamai, Luca; Falciani, Samuele; Bosetto, M.

doi:10.1007/s00374-007-0187-9

Cited by 3 publications

(1 citation statement)

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“…For the former experiment, wet freshwater sediment was homogenized using a blender, and a portion was autoclaved for 1 h (121 °C, 15 psi). Previous studies have shown that these autoclave conditions significantly suppress bacterial colonization and productivity. − Approximately 10 g of wet sediment was weighed into individual 50 mL of polypropylene tubes and sediment was spiked with 600 ng of HFPO-DA (400 μL of 1.5 μg mL –1 HFPO-DA standard), corresponding to spike concentrations of 60 ng g –1 wet weight or of 90–100 ng g –1 dry weight. Sediment in each tube was homogenized with the HFPO-DA standard and incubated in the dark at room temperature for 84 days.…”

Section: Experimental Methodsmentioning

confidence: 99%

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

Harfmann

Tito

Kieber

et al. 2021

ACS Earth Space Chem.

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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 highresolution 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.

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Section: Experimental Methodsmentioning

confidence: 99%