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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Evaluation of Calcium Alginate Microparticles for Copper Preconcentration prior to F AAS Measurements in Fresh Water

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Almeida Colombo, Marcos Bruno [1] ; Oliveira Porto, Lucas Eduardo [1] ; Arantes de Carvalho, Gabriel Gustinelli [1] ; Siqueira Petri, Denise Freitas [1] ; Oliveira, Pedro Vitoriano [1]
Total Authors: 5
[1] Univ Sao Paulo, Dept Quim Fundamental, Inst Quim, Av Prof Lineu Prestes 748, BR-05513970 Sao Paulo, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Web of Science Citations: 0

A method for separation and preconcentration of Cu2+ from fresh waters prior to flame atomic absorption spectrometry (FAAS) measurements, using calcium alginate (CA) microparticles, is proposed. Off-line analytes preconcentration was achieved using a flow-injection system incorporating a column containing CA (< 180 mu m; 300 mg). The preconcentration procedure consisted of 50 mL sample or standard (at pH = 6) loading at 2.0 mL min(-1) followed by analyte elution with 3 mL of HCl 1 mol L-1. In these conditions, the enrichment factor was 17 times. The calibration curves were built ranging from 5 to 50 mu g L-1 Cu2+. The procedure was applied for the analysis of fresh water sample spiked with 10 mu g L-1 Cu2+ resulting in a recovery higher than 94%. Additionally, inter-column reproducibility (RSD < 3,5%; n = 5 columns) and the limit of detection of 0.8 mu g L-1 were considered appropriate by taking into the maximum permitted Cu levels by the Brazilian National Environment Council (CONAMA) of 9 mu g L-1 (fresh water, Class 1). The proposed approach using CA columns is a reliable and lower cost alternative for single-stage Cu preconcentration prior to F AAS measurements and can be recommended for the analysis of river fresh waters. CA column re-usability was confirmed up to 100 adsorption-desorption cycles. (AU)

FAPESP's process: 17/22599-2 - Proposition of methods for determinations of rare earth elements and noble metals in sample of environmental and mineral interest by ICP OES
Grantee:Pedro Vitoriano de Oliveira
Support type: Regular Research Grants
FAPESP's process: 15/06161-1 - Application of polymeric substrates for the separation and concentration of rare earth elements from waters
Grantee:Gabriel Gustinelli Arantes de Carvalho
Support type: Scholarships in Brazil - Post-Doctorate