Main content area

Temporal variations of perfluoroalkyl substances partitioning between surface water, suspended sediment, and biota in a macrotidal estuary

Munoz, Gabriel, Budzinski, Hélène, Babut, Marc, Lobry, Jérémy, Selleslagh, Jonathan, Tapie, Nathalie, Labadie, Pierre
Chemosphere 2019 v.233 pp. 319-326
Copepoda, Malacostraca, bioaccumulation factor, environmental factors, estuaries, food webs, monitoring, particulates, perfluorocarbons, perfluorooctane sulfonic acid, river water, salinity, seasonal variation, sediments, shrimp, surface water, total suspended solids, water flow, zooplankton, France
A one-year monitoring study was conducted in a macrotidal estuary to assess the temporal variations and partitioning behavior of perfluoroalkyl and polyfluoroalkyl substances (PFASs). Surface water, suspended particulate matter (SPM), and invertebrates including zooplankton (copepods, mysids) and shrimps were sampled on a monthly basis in the Gironde Estuary (SW France). Environmental parameters such as suspended solid loads, salinity, and river water flow rate were highly variable at the study site. However, moderate seasonal variations were observed in terms of PFAS levels and profiles. Summed PFAS (Σ22PFASs) concentrations averaged 6.5 ± 2.7 ng L−1 in the dissolved phase and 3.0 ± 1.2 ng g−1 dry weight in the SPM. The Σ22PFASs was in the range of 1.7–13 ng g−1 wet weight in invertebrates. C5–C8 perfluoroalkyl carboxylates (PFCAs) generally prevailed in the dissolved phase, while perfluorooctane sulfonate (PFOS) was dominant in the SPM and biota. Suspended sediment-water partitioning coefficients Log KD and Log KOC were correlated with the perfluoroalkyl chain length, as were the particle-bound fraction and bioaccumulation factors (Log BAF). Compound-specific Log BAFs varied within a limited range over the period surveyed. Biomagnification factors (mysids/copepods) were consistently >1 for PFOS, perfluorooctane sulfonamide, and long-chain PFCAs (perfluorodecanoate and perfluorododecanoate), suggesting biomagnification at the base of the estuarine food web.