Development of a method for the sequential determination of cadmium and chromium from the same sample aliquot of yerba mate using high-resolution continuum source graphite furnace atomic absorption spectrometry

作者：Borges Aline R^*; Bazanella Debora N; Duarte Alvaro Tavares; Zmozinski Ariane V; Vale Maria Goreti R; Welz Bernhard

来源：Microchemical Journal, 2017, 130: 116-121.

DOI：10.1016/j.microc.2016.08.010

• Cadmium
• Chromium
• Yerba mate
• Sequential determination
• HR-CS GF AAS

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 228.802 nm for cadmium and 357.869 nm 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 037 pg and 2.4 pg was obtained for cadmium and chromium, respectively. The limits of detection were 0.25 ng for cadmium and 0.72 ng 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 028 and 2.06 mu g g(-1) and that of chromium between 027 and 237 mu g g(-1). The process of infusion preparation resulted in a leaching of around 25% for cadmium and 60% for chromium.

• 出版日期2017-1