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Updated: Jul 7, 2026

Preparation of Expanded Chitin Foams and their Use in the Removal of Aqueous Copper
Published on: February 27, 2021
Determination of copper in biological samples by flame atomic absorption spectrometry after precipitation with
Valfredo A Lemos1, Geisiane dos S Novaes, Anaildes L de Carvalho
1Laboratório de Química Analítica, Universidade Estadual do Sudoeste da Bahia, Campus de Jequié, 45206-190 Jequié, Bahia, Brazil. vlemos@uesb.br
Abstract:
A simple and sensitive method was developed for determination of trace copper by direct precipitation preconcentration and detection with Flame Atomic Absorption Spectrometry (FAAS). The reagent 2-[2'-(6-methyl-benzothiazolylazo)]-4-aminophenol (Me-BTAP) was used as precipitating agent. The experimental conditions for the quantitative precipitation of copper, such as pH, amount of reagents, temperature and the effect of diverse ions on the precipitation have been investigated. It was found that copper is quantitatively extracted (> or =95%) and the method provides a sensitivity enhancement of 40-fold for a 10 ml sample volume with a detection limit of 0.5 microg l(-1). The proposed method was successfully applied for the determination of trace copper in water, urine and biological samples.
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