title: Study on chromium-binding capacity of Callitriche cophocarpa in an aquatic environment.
abstract: The aim of the present study was to investigate the binding strength of chromium (Cr) ions to aquatic macrophyte Callitriche cophocarpa. Shoots of the plants were incubated in a natural water solution containing Cr(III) or Cr(VI) at a concentration ranging from 0.5 to 4 mM under laboratory conditions. We found that C. cophocarpa has an extremely high capacity to bind Cr. The average level of accumulation reached 28,385 or 7,315 mg kg(-1) dry weight for plants incubated with Cr(III) or Cr(VI), respectively. Shoots incubated in a 0.5 mM concentration of Cr(III) for 5 days removed almost 100 % of the metal from solution. The major pool of the bound Cr(III) ions follows the strongest mechanism of metal-binding to an organic matter. In contrast, we found that only 25 % of Cr(VI) ions are bound into the metallo-organic compounds and 57 % of Cr(VI) exists in an easily remobilizable form. Activity of a photosynthetic electron transport (as F V/F M) was evaluated with respect to the Cr-binding mechanism. Our results contribute to the development of knowledge on processes controlling bioremediation of heavy-metallic compounds in aquatic systems.
authors.affiliation: Department of Botany and Plant Physiology, Faculty of Horticulture, University of Agriculture in Kraków, Al. 29 Listopada 54, 31-425, Kraków, Poland. augustyn@ogr.ur.krakow.pl
authors.forename: Joanna
authors.initials: J
authors.lastname: Augustynowicz
authors.forename: Joanna
authors.initials: J
authors.lastname: Kyzioł-Komosińska
authors.forename: Sylwester
authors.initials: S
authors.lastname: Smoleń
authors.forename: Andrzej
authors.initials: A
authors.lastname: Waloszek
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D017608:Chromium Compounds / Q000302:isolation & purification*; D009942:Organometallic Compounds / Q000302:isolation & purification*; D018520:Plant Shoots / Q000737:chemistry / Q000254:growth & development*; D010943:Plantago / Q000737:chemistry / Q000254:growth & development*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D017608:Chromium Compounds; D009942:Organometallic Compounds; D014874:Water Pollutants, Chemical