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

Author(s)

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]

Affiliation

^[1] Univ Sao Paulo, Dept Quim Fundamental, Inst Quim, Av Prof Lineu Prestes 748, BR-05513970 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: BRAZILIAN JOURNAL OF ANALYTICAL CHEMISTRY; v. 6, n. 23, p. 20-28, APR-JUN 2019.
• Web of Science Citations: 0

Abstract

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 Opportunities: 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 Opportunities: Scholarships in Brazil - Post-Doctoral