Isomers of emerging per- and polyfluoroalkyl substances in water and sediment from the Cape Fear River, North Carolina, USA
| Autor: | G. Brooks Avery, Megumi S. Shimizu, Rosa Idalia Sanchez Garcia, Stephen A. Skrabal, Ralph N. Mead, Robert J. Kieber, Brittany Saleeby |
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| Rok vydání: | 2021 |
| Předmět: |
Geologic Sediments
Environmental Engineering Health Toxicology and Mutagenesis 0208 environmental biotechnology 02 engineering and technology 010501 environmental sciences 01 natural sciences River water Water column Isomerism Rivers Tandem Mass Spectrometry North Carolina Structural isomer Environmental Chemistry 0105 earth and related environmental sciences Fluorocarbons River sediment Chemistry Public Health Environmental and Occupational Health Sediment General Medicine General Chemistry Branching points Pollution Water sample 020801 environmental engineering Environmental chemistry Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Chemosphere. 262:128359 |
| ISSN: | 0045-6535 |
| Popis: | Per- and polyfluoroalkyl substances (PFAS) have become ubiquitous environmental contaminants found in many parts of the globe and in all environmental compartments. The phase out of legacy C8 PFAS has led to an increase in functionality of the carbon backbone chain to include ether linkages and branching points. With the increased production of functionalized PFAS, there remains a paucity of information regarding the occurrence of constitutional isomers in the environment. In this study, a series of novel PFAS constitutional isomers were detected by high resolution mass spectrometry and characterized by MS/MS in river water collected weekly over 40 weeks. Constitutional isomers of C4H2F8O4S1 (−1.8 ± 2.5 ppm) were detected for the first time in 83% of the samples analyzed and the MS/MS fragmentation patterns clearly indicated there were two coeluting isomers present. Two chromatographically resolved peaks with deprotonated molecular formula C7H1F14O5S1 (1.9 ± 2.7 and 2.2 ± 3.1 ppm) were detected in 85% of the samples measured. MS/MS fragmentation patterns and a standard provided by a fluorochemical manufacturer confirmed the two isomers. A series of novel chlorinated PFAS were detected (M-1: C11H1Cl1F20O5 0.9 ± 2.7 ppm and C14H1Cl1F26O6 2.1 ± 2.6 ppm) in 34% of the water samples analyzed. The exact structure is not confirmed. River sediment collected below the water sample location contained several of the compounds detected in the water column illustrating the connectivity between the environmental compartments. Results highlight the need for further studies on the occurrence of isomers and authentic standards to confirm structures. |
| Databáze: | OpenAIRE |
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