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ADVANCING THE USE OF SUCTION LYSIMETERS TO INFORM SOIL LEACHING AND REMEDIATION OF PFAS SOURCE ZONES
Rayner, J.L., A. Lee, S. Corish, S. Leake, E. Bekele, and G.B. Davis.
Groundwater Monitoring & Remediation 44(3):49-60(2024)
Filed Under: Demonstrations
Filed Under: Demonstrations
This article reports outcomes of lysimeter investigations conducted across three sites and 18 lysimeters within fine-textured soil profiles. Soil cores from the same locations were recovered. PFAS concentrations in soils and lysimeter porewater were compared with prior lab investigations. Variable concentration distributions with depth of PFAS in soils were found with a max PFAS sum of ~56 mg/kg, dominated by PFOS. The max PFAS sum in porewater was 13.5 mg/L. Comparison across all collocated soil and porewater concentrations did not provide consistent trends. PFAS mass fractions within lysimeter porewater samples were much higher for most PFAS than mass fractions determined from lab investigations, but the fraction was lower for PFOS. Results indicate preferential recovery of individual shorter chain PFAS via leaching at lower liquid: soil ratios such as those experienced under suction during recovery of porewater by lysimeters. Suggestions are offered to advance the use of suction lysimeters in promoting porewater PFAS concentrations as an alternative for regulatory compliance and closing the gap between field and lab approaches.
Groundwater Monitoring & Remediation 44(3):49-60(2024)
Filed Under: Demonstrations
Filed Under: Demonstrations
This article reports outcomes of lysimeter investigations conducted across three sites and 18 lysimeters within fine-textured soil profiles. Soil cores from the same locations were recovered. PFAS concentrations in soils and lysimeter porewater were compared with prior lab investigations. Variable concentration distributions with depth of PFAS in soils were found with a max PFAS sum of ~56 mg/kg, dominated by PFOS. The max PFAS sum in porewater was 13.5 mg/L. Comparison across all collocated soil and porewater concentrations did not provide consistent trends. PFAS mass fractions within lysimeter porewater samples were much higher for most PFAS than mass fractions determined from lab investigations, but the fraction was lower for PFOS. Results indicate preferential recovery of individual shorter chain PFAS via leaching at lower liquid: soil ratios such as those experienced under suction during recovery of porewater by lysimeters. Suggestions are offered to advance the use of suction lysimeters in promoting porewater PFAS concentrations as an alternative for regulatory compliance and closing the gap between field and lab approaches.
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