title: Adsorption characteristics of multiple microcystins and cylindrospermopsin on sediment: Implications for toxin monitoring and drinking water treatment.
abstract: Adsorption of mixtures of cyanotoxins onto sediment as a dominant mechanism in the elimination of cyanotoxins from the aqueous phase has not been extensively investigated. The aim of this study was to investigate adsorption and desorption behavior of six microcystins including microcystin (MC)-LR, RR, YR, LY, LW and LF and cylindrospermopsin (CYN) on natural sediment. Freundlich and Langmuir isotherms could be fitted for MC-LR, RR, YR and CYN. Sorption kinetics showed immediate rapid adsorption for all cyanotoxins: CYN, MCLW and MCLF were adsorbed 72.6%, 56.7% and 55.3% respectively within 2 h. Results of desorption experiments demonstrated that less than 9% of cyanotoxins desorbed from sediment within 96 h. Adsorption of cyanotoxins onto three fractionated sediments particles, clay-silt (<75 μm), find sand (75-315 μm) and coarse sand (315-2000 μm) demonstrated that adsorption capacity of coarse sand fraction for all the tested cyanotoxins was less than 4% of the clay-silt fraction. Results of this study revealed that there is a potential for cyanotoxins to accumulate in the sediments of lakes, as well as in drinking water treatment plants. Monitoring programs must consider cyanotoxins in the particulate phase to avoid largely underestimating toxin concentrations following their release from blooms.
authors.affiliation: Polytechnique de Montreal, Civil, Mineral and Mining Engineering Department, P.O. Box 6079, Station Centre-ville, Montreal, Quebec, H3C 3A7, Canada. Electronic address: ehsan.maghsoudi@polymtl.ca.
authors.forename: Ehsan
authors.initials: E
authors.lastname: Maghsoudi
authors.affiliation: Polytechnique de Montreal, Civil, Mineral and Mining Engineering Department, P.O. Box 6079, Station Centre-ville, Montreal, Quebec, H3C 3A7, Canada.
authors.forename: Michèle
authors.initials: M
authors.lastname: Prévost
authors.affiliation: Department of Chemistry, Université de Montreal, C.P. 6128, Centre-ville, Montréal, QC, H3C 3J7, Canada.
authors.forename: Sung
authors.initials: S
authors.lastname: Vo Duy
authors.affiliation: Department of Chemistry, Université de Montreal, C.P. 6128, Centre-ville, Montréal, QC, H3C 3J7, Canada.
authors.forename: Sébastien
authors.initials: S
authors.lastname: Sauvé
authors.affiliation: Polytechnique de Montreal, Civil, Mineral and Mining Engineering Department, P.O. Box 6079, Station Centre-ville, Montreal, Quebec, H3C 3A7, Canada.
authors.forename: Sarah
authors.initials: S
authors.lastname: Dorner
mesh_terms: D000470:Alkaloids; D001427:Bacterial Toxins; D000458:Cyanobacteria / Q000378:metabolism; D000087522:Cyanobacteria Toxins; D060766:Drinking Water / Q000737:chemistry*; D019015:Geologic Sediments / Q000032:analysis*; D060106:Lakes; D008387:Marine Toxins; D052998:Microcystins / Q000032:analysis*; D014498:Uracil / Q000031:analogs & derivatives* / Q000032:analysis; D014874:Water Pollutants, Chemical; D018508:Water Purification
chemical_list: D000470:Alkaloids; D001427:Bacterial Toxins; D000087522:Cyanobacteria Toxins; D060766:Drinking Water; D008387:Marine Toxins; D052998:Microcystins; D014874:Water Pollutants, Chemical; C089595:cylindrospermopsin; D014498:Uracil; C078588:microcystin; C057862:cyanoginosin LR
keywords: Adsorption; Cyanobacteria toxins; Cylindrospermopsin; Microcystins; Sediment; Size fraction