title: Behaviour of butyltin compounds in the sediment pore waters of a contaminated marina (Port Camargue, South of France).
abstract: Despite the ban on tributyltin (TBT) in marine paints, harbour sediments are still highly contaminated by this antifouling agent. Concentrations of TBT and its dealkylated products dibutyltin (DBT) and monobutyltin (MBT) were determined in the pore waters of Port Camargue, a large marina located on the French Mediterranean coast. Pore waters were sampled in the field using peepers deployed in summer 2012 and 2013 and in winter 2012-2013. The winter surveys were characterized by the presence of sulphides in pore waters from a depth of 5 cm, which was not the case in winter. In summer 2013, TBT was shown to be released into pore waters below the sediment-water interface (SWI) at concentrations of up to 70 ngSn L(-1). This release was also observed in sediment anaerobic incubations and was attributed to the mineralization of the sedimentary organic matter, possible stabilization of TBT by complexation with sulphides, and lower debutylation rates in anoxic than in oxic conditions. In summer 2012, a comparatively lower concentration of TBT (around 20 ngSn L(-1) below the SWI) was measured and the presence of methyltin species was detected. We hypothesize that the differences between the two surveys reflect different microbial activity. In winter 2012-2013, marked by Fe-reducing conditions in the sediments, TBT was released into solution at the SWI at concentrations of up to 40 ngSn L(-1). Sediments are thus a continuing source of TBT for the overlying waters despite the ban on its use for boats in France.
authors.affiliation: Laboratoire HydroSciences UMR 5569, CNRS, IRD, Université Montpellier, 163 Rue Auguste Brousonnet, CC 57, 34090, Montpellier, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Briant
authors.affiliation: Laboratoire HydroSciences UMR 5569, CNRS, IRD, Université Montpellier, 163 Rue Auguste Brousonnet, CC 57, 34090, Montpellier, France. Electronic address: chrystelle.bancon-montigny@umontpellier.fr.
authors.forename: Chrystelle
authors.initials: C
authors.lastname: Bancon-Montigny
authors.affiliation: Laboratoire HydroSciences UMR 5569, CNRS, IRD, Université Montpellier, 163 Rue Auguste Brousonnet, CC 57, 34090, Montpellier, France.
authors.forename: Rémi
authors.initials: R
authors.lastname: Freydier
authors.affiliation: Laboratoire HydroSciences UMR 5569, CNRS, IRD, Université Montpellier, 163 Rue Auguste Brousonnet, CC 57, 34090, Montpellier, France.
authors.forename: Sophie
authors.initials: S
authors.lastname: Delpoux
authors.affiliation: Laboratoire HydroSciences UMR 5569, CNRS, IRD, Université Montpellier, 163 Rue Auguste Brousonnet, CC 57, 34090, Montpellier, France.
authors.forename: Françoise
authors.initials: F
authors.lastname: Elbaz-Poulichet
mesh_terms: D004784:Environmental Monitoring / Q000379:methods*; D005602:France; D019015:Geologic Sediments / Q000737:chemistry*; D009947:Organotin Compounds / Q000032:analysis; D010150:Paint; D012623:Seawater / Q000737:chemistry*; D012767:Ships; D014220:Trialkyltin Compounds / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D009947:Organotin Compounds; D014220:Trialkyltin Compounds; D014874:Water Pollutants, Chemical; C516409:mono-n-butyltin; C056189:di-n-butyltin; C036564:methyltin; C011559:tributyltin
keywords: Butyltins; Marina; Peepers; Pore water; Sediment