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Sociedade Brasileira de Química, SBQ, Journal of the Brazilian Chemical Society, 2012

DOI: 10.1590/s0103-50532012000400017

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Fast and Interference Free Determination of Calcium and Magnesium in Honeys by Solid Phase Extraction Followed by Flame Atomic Absorption Spectrometry

Journal article published in 2012 by Pawel Pohl ORCID, Helena Stecka, Piotr Jamroz ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

A sample preparation procedure based on the solid phase extraction and the two-step elution was developed for the determination of the total concentrations of Ca and Mg in bee honeys. The honey samples were treated as follows: the 5.0% (m/v) sample solutions (50 mL) were passed at the fow rate of 20 mL min -1 through the resin beds of Dowex 50W×8-400 to retain the Ca(II) and Mg(II) ions and separate them from the matrix of glucose and fructose in addition to the anionic minerals. Afterwards, 20 mL of a 0.5 mol L -1 HNO 3 solution was used to remove the K and Na ions. Finally, Ca and Mg were eluted prior to the measurements of their concentrations by flame atomic absorption spectrometry (FAAS) using 5 mL of a 2.0 mol L -1 HCl solution. The proposed sample preparation procedure was fast (30 min) and enabled to measure the concentrations of Ca and Mg in honey with the precision of 1-5% and the accuracy of 1-3%. The limits of detection of 24 ng g -1 of Ca and 4.4 ng g -1 of Mg were obtained for FAAS with this procedure.