Royal Society of Chemistry, Journal of Analytical Atomic Spectrometry, 1(30), p. 154-161, 2015
DOI: 10.1039/c4ja00261j
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Miniaturized atmospheric pressure glow discharge sustained in a compact discharge cell in contact with a flowing liquid cathode was used for element analysis of honeys by optical emission spectrometry. A simplified sample preparation procedure was proposed and samples of honeys were only dissolved in water and acidified to a concentration of 0.10 mol L-1. Resulting 1.0% m/V in case of K and Na and 5.0% m/V in case of Ca, Cu, Fe, Li, Mg, Mn, Rb and Zn solutions of honeys were directly introduced into the discharge cell acting as the liquid cathode of the discharge. To eliminate matrix effects coming from fructose and glucose, a non-ionic surfactant (Triton X-405) was added to solutions and this resulted in improving signals of studied elements. For calibration, simple (for K and Na) and matrix-matching (for other elements) standard solutions were used. The method was proved to give reliable results and applied in analysis of 16 commercial white- to amber-colored honeys with limits of detection at level of 1.0 (Ca), 0.7 (Cu), 2.5 (Fe), 0.5 (K), 0.02 (Li), 0.2 (Mg), 1.8 (Mn), 0.04 (Na), 0.1 (Rb) and 0.2 (Zn) mg g-1.