Sorption and partitioning of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) onto sediments of Diep and Plankenburg river systems Western Cape, South Africa

Fagbayigbo, Bamidele Oladapo; Opeolu, Beatrice O; Fatoki, Olalekan S; Olatunji, Olatunde Stephen; Human, Izanne Susan

doi:10.1016/j.eti.2021.102110

Cited by 15 publications

(9 citation statements)

References 57 publications

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“…The log K d (liters per kilogram) values in the present study range from 1.09 for the PFBS in the mixed tank containing the combusted soil to 2.31 for the PFOA in the individual tank containing the noncombusted soil. These values are consistent with previously reported measurements of 0.53-2.79 L kg −1 for PFOA and 0.05-2.80 L kg −1 for PFBS (Chen et al, 2019;Fagbayigbo et al, 2022;Khan et al, 2022;Kwadijk et al, 2010;Nguyen et al, 2020).…”

Section: Pfas Uptakesupporting

confidence: 93%

Analysis of a Passive Sampling Device to Assess the Behavior of Per‐ and Polyfluoroalkyl Substances in Sediments

Atoufi

Lampert

2023

Enviro Toxic and Chemistry

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Per‐ and polyfluoroalkyl substances (PFAS) are an emerging class of compounds that cause health and environmental problems worldwide. In aquatic environments, PFAS may bioaccumulate in sediment organisms, which can affect the health of organisms and ecosystems. As such, it is important to develop tools to understand their bioaccumulation potential. In the present study, the uptake of perfluorooctanoic acid (PFOA) and perfluorobutane sulfonic acid (PFBS) from sediments and water was assessed using a modified polar organic chemical integrative sampler (POCIS) as a passive sampler. While POCIS has previously been used to measure time‐weighted concentrations of PFAS and other compounds in water, in our study, the design was adapted for analyzing contaminant uptake and porewater concentrations in sediments. The samplers were deployed into seven different tanks containing PFAS‐spiked conditions and monitored over 28 days. One tank contained only water with PFOA and PFBS, three tanks contained soil with 4% organic matter, and three tanks contained soil combusted at 550 °C to minimize the influence of labile organic carbon. The uptake of PFAS from the water was consistent with previous research using a sampling rate model or simple linear uptake. For the samplers placed in the sediment, the uptake process was explained well using a mass transport based on the external resistance from the sediment layer. Uptake of PFOS in the samplers occurred faster than that of PFOA and was more rapid in the tanks containing the combusted soil. A small degree of competition was observed between the two compounds for the resin, although these effects are unlikely to be significant at environmentally relevant concentrations. The external mass transport model provides a mechanism to extend the POCIS design for measuring porewater concentrations and sampling releases from sediments. This approach may be useful for environmental regulators and stakeholders involved in PFAS remediation. Environ Toxicol Chem 2023;00:1–13. © 2023 SETAC

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Section: Pfas Uptakesupporting

confidence: 93%

Analysis of a Passive Sampling Device to Assess the Behavior of Per‐ and Polyfluoroalkyl Substances in Sediments

Atoufi

Lampert

2023

Enviro Toxic and Chemistry

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“…Wastewater treatment works contribute substantially more PFOA to the catchment (20.37 kg/year) than has been estimated at the catchment outlet at Westy (14.36 kg/year), indicating substantial potential storage of PFOA in the River Mersey Basin. Sorption of PFOA and PFOS to sediments has been widely reported, , and PFOA sequestration in river channel sediments possibly explains the attenuation of PFOA loads in the River Mersey Basin. However, such large storage volumes in urban river basins are concerning, and these sediments may represent an important secondary nonpoint source of PFOA to river water and biota .…”

Section: Resultsmentioning

confidence: 94%

PFAS River Export Analysis Highlights the Urgent Need for Catchment-Scale Mass Loading Data

Byrne,

Mayes,

James

et al. 2024

Environ. Sci. Technol. Lett.

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Source apportionment of per-and polyfluoroalkyl substances (PFAS) requires an understanding of the mass loading of these compounds in river basins. However, there is a lack of temporally variable and catchment-scale mass loading data, meaning identification and prioritization of sources of PFAS to rivers for management interventions can be difficult. Here, we analyze PFAS concentrations and loads in the River Mersey to provide the first temporally robust estimates of PFAS export for a European river system and the first estimates of the contribution of wastewater treatment works (WwTWs) to total river PFAS export. We estimate an annual PFAS export of 68.1 kg for the River Mersey and report that the yield of perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) in the catchment is among the highest recorded globally. Analysis of river and WwTW loads indicates approximately one-third of PFOA emitted from WwTWs is potentially stored in the catchment and approximately half of PFOS transported by the River Mersey may not originate from WwTWs. As governments move toward regulation of PFAS in WwTW effluents, our findings highlight the complexity of PFAS source apportionment and the need for catchment-scale mass loading data. This study indicates that strategies for reducing PFAS loading that focus solely on WwTW effluents may not achieve river water quality targets.

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“…The distribution coefficient (log Kd values) is used as an indicator to assess the fate of organic contaminants [ 41 ]. The PFAS sediment/water distribution coefficient, Kd , in the Nairobi River was calculated using Equation (1) [ 42 , 43 ].…”

Section: Resultsmentioning

confidence: 99%

Occurrence and Distribution of Per- and Polyfluoroalkyl Substances from Multi-Industry Sources to Water, Sediments and Plants along Nairobi River Basin, Kenya

Chirikona

Quinete

Gonzalez

et al. 2022

IJERPH

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Per- and polyfluoroalkyl substances (PFAS) are ever-present pollutants in the environment. They are persistent and bio-accumulative with deleterious health effects on biota. This study assesses the levels of PFAS in environmental matrices along the Nairobi River, Kenya. An aggregate of 30 PFAS were determined in water, while 28 PFAS were detected in sediments and plants using solid phase extraction then liquid chromatography–mass spectrometric techniques. In water, higher levels of perfluoroundecanoic acids of up to 39.2 ng L−1 were observed. Sediment and plant samples obtained in the midstream and downstream contained higher levels of perfluorooctanoic acid of up to 39.62 and 29.33 ng g−1, respectively. Comparably, levels of long-chain PFAS were higher in water and sediments than in plants. Sediment/water log distribution of selected PFAS ranged between 2.5 (perfluoroundecanoic acid) and 4.9 (perfluorooctane sulfonate). The level of perfluorooctane sulfonate (1.83 ng L−1) in water is above the acceptable level in surface water posing high human health and ecological risks. The observed PFAS concentrations and distribution were attributed mainly to multi-industries located along the river, among other sources. The knowledge of PFAS occurrence and distribution in Nairobi River, Kenya, provides important information to local regulatory agencies for PFAS pollution control.

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Sorption and partitioning of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) onto sediments of Diep and Plankenburg river systems Western Cape, South Africa

Cited by 15 publications

References 57 publications

Analysis of a Passive Sampling Device to Assess the Behavior of Per‐ and Polyfluoroalkyl Substances in Sediments

Analysis of a Passive Sampling Device to Assess the Behavior of Per‐ and Polyfluoroalkyl Substances in Sediments

PFAS River Export Analysis Highlights the Urgent Need for Catchment-Scale Mass Loading Data

Occurrence and Distribution of Per- and Polyfluoroalkyl Substances from Multi-Industry Sources to Water, Sediments and Plants along Nairobi River Basin, Kenya

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