Author(s): Yabuki, Lauren N.M. [UNESP] ; Menegário, Amauri A. [UNESP] ; Gemeiner, Hendryk [UNESP] ; Rolisola, Ana Marta C.M. [UNESP] ; Gastmans, Didier [UNESP] ; Williams, Paul N.
Date: 2019
Persistent ID: http://hdl.handle.net/11449/189434
Origin: Oasisbr
Subject(s): Labile species; Macro-DGT; Metal; River water; Spent coffee grounds
Made available in DSpace on 2019-10-06T16:40:37Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-12-01
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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.
Universidade Estadual Paulista (Unesp) Instituto de Geociências e Ciências Exatas, Rio Claro, Av. 24 A, 1515
Universidade Estadual Paulista (Unesp) Centro de Estudos Ambientais, Rio Claro, Av. 24 A, 1515
Queen's University Belfast Institute for Global Food Security School of Biological Sciences
Universidade Estadual Paulista (Unesp) Instituto de Geociências e Ciências Exatas, Rio Claro, Av. 24 A, 1515
Universidade Estadual Paulista (Unesp) Centro de Estudos Ambientais, Rio Claro, Av. 24 A, 1515
FAPESP: 2016/14227-5
FAPESP: 2018/17069-7
CNPq: 304849/2016-2
CNPq: 403666/2016-3
