Abstract
A simple, fast and sensitive method for the sequential determination of cadmium and chromium from the same sample aliquot of yerba mate and leaves of yerba mate is proposed using high-resolution continuum source graphite furnace atomic absorption spectrometry and direct solid sample analysis. The measures were made using the analytical line at 228.802nm for cadmium and 357.869nm for chromium, and three pixels each for evaluation. The reference material NCS ZC73014 (trace elements in tea) has been analyzed and the results were in agreement with the certified values. A characteristic mass of 0.37pg and 2.4pg was obtained for cadmium and chromium, respectively. The limits of detection were 0.25ng for cadmium and 0.72ng for chromium, and the precision, expressed as relative standard deviation, was around 10%. Thirteen commercial samples and five leave samples were analyzed and the concentration of cadmium varied between 0.28 and 2.06μgg−1 and that of chromium between 0.27 and 2.37μgg−1. The process of infusion preparation resulted in a leaching of around 25% for cadmium and 60% for chromium.
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