High-resolution examination of the colloidal speciation of cadmium in estuarine waters (Penzé, NW France)

Autor: Virginie Tanguy, Matthieu Waeles, Ricardo Riso
Přispěvatelé: Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2014
Předmět:
Zdroj: Marine Chemistry
Marine Chemistry, Elsevier, 2014, 167 (SI), pp.71-81. ⟨10.1016/j.marchem.2014.05.001⟩
ISSN: 0304-4203
DOI: 10.1016/j.marchem.2014.05.001⟩
Popis: International audience; We report here for the first time a high-resolution study of the colloidal cadmium speciation with seasonal variations in estuarine waters. Over this 1-year study, seven colloidal fractions below 0.45 pm were analysed at 6 stations along the salinity gradient of the Penze estuary, with the aim to provide some insights into the mechanisms that control Cd concentrations and behaviour under estuarine mixing. A classic and strong positive Cd anomaly occurred at mid-estuary throughout the seasonal cycle. This anomaly corresponded essentially to an input of low molecular weight (LMW) compounds, i.e. in the size range 5-50 kDa, arguing that besides the usual hypothesis of Cd complexation with chloride, it is also of fundamental importance to consider the role of colloidal organic species in favouring Cd mobilisation. The colloidal repartition of Cd being notably different to that of humic substances, the ligands involved in Cd complexation are more probably of allochthonous origin. Over the annual cycle, total dissolved Cd (
Databáze: OpenAIRE