title: An electroanalytical approach for evaluation of biochar adsorption characteristics and its application for lead and cadmium determination.
abstract: This work describes for first time the use of electroanalytical techniques for evaluation of adsorptive proprieties of biochar using it as electrode modifier and its application for preconcentration and determination of Lead(II) and Cadmium(II) under differential pulse adsorptive voltammetric conditions (DPAdSV). Samples of biochars were obtained from castor oil cake using a predefined set of experimental conditions varying the heating rate (V), final temperature (T) and warm-up period (P) and subsequently used for carbon paste modified electrode (CPME) preparation. The proposed method was applied for Lead(II) and Cadmium(II) determination in spiked simulated industrial effluents and the limit of detection obtained for both metals were adequated for determination of these evaluated ions taking into account the limits established by Brazilian legislation. For all samples analyzed, recoveries ranged from 95% to 104% were obtained and no significative interferences were observed for common cations in water samples.
authors.affiliation: Laboratório de Sensores Eletroquímicos (LabSensE), Departamento de Química, Universidade Federal do Paraná (UFPR), CEP 81531-980, Curitiba-PR, Brazil.
authors.forename: Talita Mayumi
authors.initials: TM
authors.lastname: Suguihiro
authors.forename: Paulo Roberto
authors.initials: PR
authors.lastname: de Oliveira
authors.forename: Edivaltrys Inayve Pissinati
authors.initials: EI
authors.lastname: de Rezende
authors.forename: Antonio Sálvio
authors.initials: AS
authors.lastname: Mangrich
authors.forename: Luiz Humberto
authors.initials: LH
authors.lastname: Marcolino
authors.forename: Márcio F
authors.initials: MF
authors.lastname: Bergamini
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000032:analysis*; D002606:Charcoal; D055664:Electrochemical Techniques / Q000379:methods*; D007854:Lead / Q000032:analysis*; D057230:Limit of Detection
chemical_list: C540010:biochar; D002104:Cadmium; D002606:Charcoal; D007854:Lead
keywords: Adsorption of Lead and Cadmium; Biochar; Carbon paste electrode; Stripping analysis