title: Evaluation of cations and chelating agents as extracellular extractants for Cu, Pb, V and Zn in the sequential elution technique applied to the terrestrial moss Pseudoscleropodium purum.
abstract: Three experiments were carried out to select the best extractant for use in the sequential elution technique, to enable extraction of Cu, Pb, V and Zn from the extracellular fraction of the terrestrial moss Pseudoscleropodium purum. The optimal concentrations of the extractants tested (CoCl(2), NiCl(2), Pb(NO(3))(2), SrCl(2), dimercaprol, EDTA, penicillamine) were determined on the basis of the maximum extraction of Zn achieved without any alteration of the plasma membrane. The capacity of these agents (at the optimal concentrations established) to extract the extracellular fractions of Cu, Pb, V and Zn was then evaluated. Extraction with 10mM EDTA is recommended for all 4 elements considered. As a second option, the use of 50mM penicillamine is recommended to extract Cu, 30 mM dimercaprol to extract Pb and V and 20 mM NiCl(2) to extract Zn. It was also concluded that these results cannot be extrapolated to other cryptogams, and that separate assays are required.
authors.affiliation: Ecología, Departamento de Biología Celular y Ecología, Facultad de Biología, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain. alicia.perez@usc.es
authors.forename: Alicia
authors.initials: A
authors.lastname: Pérez-Llamazares
authors.forename: Cristóbal J
authors.initials: CJ
authors.lastname: Galbán-Malagón
authors.forename: Jesús R
authors.initials: JR
authors.lastname: Aboal
authors.forename: J
authors.initials: J
authors.lastname: Angel Fernández
authors.forename: Alejo
authors.initials: A
authors.lastname: Carballeira
mesh_terms: D019068:Bryopsida / Q000737:chemistry*; D002412:Cations / Q000032:analysis; D002614:Chelating Agents / Q000032:analysis*; D003300:Copper / Q000032:analysis; D004112:Dimercaprol / Q000032:analysis; D004492:Edetic Acid / Q000032:analysis; D007854:Lead / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis*; D010396:Penicillamine / Q000032:analysis; D014639:Vanadium / Q000032:analysis; D015032:Zinc / Q000032:analysis
chemical_list: D002412:Cations; D002614:Chelating Agents; D019216:Metals, Heavy; D014639:Vanadium; D004112:Dimercaprol; D007854:Lead; D003300:Copper; D004492:Edetic Acid; D010396:Penicillamine; D015032:Zinc