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Residual biomass of coffee as a binding agent in diffusive gradients in thin-films technique for Cd, Cu, Ni, Pb and Zn measurement in waters.
Yabuki, Lauren N M; Menegário, Amauri A; Gemeiner, Hendryk; Rolisola, Ana Marta C M; Gastmans, Didier; Williams, Paul N.
Afiliação
  • Yabuki LNM; Universidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claro, Av. 24 A, 1515, 13506-900, São Paulo, Brazil.
  • Menegário AA; Universidade Estadual Paulista (Unesp), Centro de Estudos Ambientais, Rio Claro, Av. 24 A, 1515, 13506-900, São Paulo, Brazil. Electronic address: amauri.antonio-menegario@unesp.br.
  • Gemeiner H; Universidade Estadual Paulista (Unesp), Centro de Estudos Ambientais, Rio Claro, Av. 24 A, 1515, 13506-900, São Paulo, Brazil.
  • Rolisola AMCM; Universidade Estadual Paulista (Unesp), Centro de Estudos Ambientais, Rio Claro, Av. 24 A, 1515, 13506-900, São Paulo, Brazil.
  • Gastmans D; Universidade Estadual Paulista (Unesp), Centro de Estudos Ambientais, Rio Claro, Av. 24 A, 1515, 13506-900, São Paulo, Brazil.
  • Williams PN; Queen's University Belfast, Institute for Global Food Security, School of Biological Sciences, Belfast, BT9 5BN, United Kingdom.
Talanta ; 205: 120148, 2019 Dec 01.
Article em En | MEDLINE | ID: mdl-31450468
Spent coffee grounds (SCG) immobilized in agarose gel are proposed as a novel binding agent for application in the Diffusive Gradients in Thin films (DGT) technique for the determination of Cd, Cu, Ni, Pb and Zn in waters. The SCG-agarose gel was characterized by Scanning Electron Microscopy, Energy Dispersive X-ray Spectrometry and Porosimetry by nitrogen adsorption. Elution of analytes from the binding agent was effectively performed with 2 mol L-1 HCl. The effects of key DGT parameters (e.g. immersion time, ionic strength and pH) were evaluated with a deployment of DGT devices (DGT-SCG) in synthetic solutions with ionic strengths between 0.005 mol L-1 and 0.1 mol L-1 and within a pH range of 3.5-8.0. The results were in excellent agreement with the predicted theoretical curve for mass uptake. Consistent results were found for solutions with ionic strengths between 0.005 mol L-1 and 0.1 mol L-1 and within a pH range of 3.5-8.0. The DGT-SCG performance was also evaluated in two spiked river water samples (Corumbataí and Piracicaba river) with satisfactory uptake values (CDGT-SCG/Csol) between 0.74 and 1.53. The proposed DGT-SCG opens opportunities for using residual biomass as binding phase in the DGT technique, showing low costs in production and complying with "green" technology approaches.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Talanta Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Brasil País de publicação: Holanda

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Talanta Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Brasil País de publicação: Holanda