Journal
TALANTA
Volume 205, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2019.120148
Keywords
Macro-DGT; Spent coffee grounds; Metal; Labile species; River water
Categories
Funding
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo [FAPESP - 2018/17069-7, FAPESP - 2016/14227-5]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [CNPq - 304849/2016-2, CNPq - 403666/2016-3]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
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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 (Corumbatai and Piracicaba river) with satisfactory uptake values (CDGT-SCG/C-sol) 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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