US EPA

6315762 

Journal Article 

Sorption behaviour of per- and polyfluoroalkyl substances (PFASs) in tropical soils 

Oliver, DP; Li, Y; Orr, R; Nelson, P; Barnes, M; Mclaughlin, MJ; Kookana, RS 

2020 

Yes 

Environmental Pollution
ISSN: 0269-7491
EISSN: 1873-6424 

258 

113726 

English 

32006795 

10.1016/j.envpol.2019.113726 

WOS:000519655100057 

The sorption behaviour of three perfluoroalkyl substances (PFASs), namely perfluorooctane sulfonic acid (PFOS), perfluorooctanoic acid (PFOA) and perfluorohexane sulfonic acid (PFHxS), was determined on 28 tropical soils. Tropical soils are often highly weathered, richer in sesquioxides than temperate soils and may contain variable charge minerals. There are little data on sorption of PFASs in tropical soils. The highest Kd values were found for PFOS with mean values ranging from 0 to 31.6 L/kg. The Kd values for PFOA and PFHxS ranged from 0 to 4.9 L/kg and from 0 to 5.6 L/kg, respectively. While these values are in the range of literature sorption data, the average Kd values for PFOS and PFOA from the literature were 3.7 times and 3.6 times higher, respectively, than those measured in this study. Stepwise regression analysis did explain some of the variance, but with different explanatory variables for the different PFASs. The main soil properties explaining sorption for PFOS and PFOA were oxalate-extractable Al and pH, and for PFHxS was pH. 

PFOS; PFOA; PFHxS; Sorption; Tropical soils; Weathered soils