Special Issue (Environmental Engineering)Paper
RELATIONSHIP BETWEEN VERTICAL DISTRIBUTION OF PFASs IN SOIL AND GROUNDWATER AROUND AIR MILITARY FACILITIES
2023 Volume 79 Issue 25 Article ID: 23-25049
Details
2023 Volume 79 Issue 25 Article ID: 23-25049
In the report of the Central Environment Council in May 2020, PFOS and PFOA were designated as monitoring items for public water bodies and groundwater, and provisional guideline values were set. Although there are many reported cases of PFASs concentrations in environmental water, the relationship between PFASs contamination in soil and PFASs concentrations in groundwater is not clear. In this study, 21 PFASs (13 PFCAs, 8 PFSAs) and 14 PFASs precursors were analyzed in 37 soil boring samples from Kadena Town, Okinawa Prefecture. The main conclusions are as follows. 1) 20 out of 35 PFASs were detected above the lower limit of quantitation. 2) Main contaminant was PFOS (2,620 ng/kg-dry), the second was PFHxA (2,280 ng/kg-dry), and the third was 8:2FTS (360 ng/kg-dry), and the fourth was 6:2 FTS (222 ng/kg-dry). 3) PFOS concentration in surface soils was 28, 000 ng/kg-dry, it was 180 times higher than the median global background (Rankin et al., 2016) and 74 times higher than the U.S.EPA guidelines for groundwater protection. 4) Up to 1,530 ng/L of PFOS was detected in the surrounding groundwater.
