Combined spatial and retrospective analysis of fluoroalkyl chemicals in fluvial sediments reveal changes in levels and patterns over the last 40 years.
Environ Pollut
; 253: 1117-1125, 2019 Oct.
Article
em En
| MEDLINE
| ID: mdl-31434189
ABSTRACT
Bed sediments and a dated sediment core were collected upstream and downstream from the city of Lyon (France) to assess the spatial and temporal trends of contamination by per- and polyfluoroalkyl substances (PFASs) in this section of the Rhône River. Upstream from Lyon, concentrations of total PFASs (ΣPFASs) in sediments are low (between 0.19 and 2.6â¯ngâ¯g-1 dry weight - dw), being characterized by a high proportion of perfluorooctane sulfonate (PFOS). Downstream from Lyon, and also from a fluoropolymer manufacturing plant, ΣPFASs concentrations reach 48.7â¯ngâ¯g-1 dw. A gradual decrease of concentrations is reported at the coring site further downstream (38â¯km). Based on a dated sediment core, the temporal evolution of PFASs is reconstructed from 1984 to 2013. Prior to 1987, ΣPFASs concentrations were low (≤2â¯ngâ¯g-1 dw), increasing to a maximum of 51â¯ngâ¯g-1 dw in the 1990s and then decreasing from 2002 to the present day (â¼10â¯ngâ¯g-1 dw). In terms of the PFAS pattern, the proportion of perfluoroalkyl sulfonic acids (PFSAs) has remained stable since the 1980s (â¼10%), whereas large variations are reported for carboxylic acids (PFCAs). Long chain- (Câ¯>â¯8) PFCAs characterized by an even number of perfluorinated carbons represent about 74% of the total PFAS load until 2005. However, from 2005 to 2013, the relative contribution of long chain- (Câ¯>â¯8) PFCAs with an odd number of perfluorinated carbons reaches 80%. Such changes in the PFAS pattern likely highlight a major shift in the industrial production process. This spatial and retrospective study provides valuable insights into the long-term contamination patterns of PFAS chemicals in river basins impacted by both urban and industrial activities.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Poluentes Químicos da Água
/
Poluição Química da Água
/
Monitoramento Ambiental
/
Sedimentos Geológicos
/
Fluorocarbonos
Tipo de estudo:
Observational_studies
País/Região como assunto:
Europa
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article