Abstract:

A method was developed for simultaneous determination of multi-elements, such as Fe, Zn, Cu, and Mn in Osmanthus fragrans flower tea substitute by microwave digestion-ICP-AES. The parameters and working conditions of ICP-AES were optimized in this study. The results showed that the detection limits of Fe, Zn, Cu, and Mn were 1.6 × 10-3, 6.1 × 10-3, 2.5 × 10-3 and 5.3×10-3 mg/L, respectively. And the linear ranges were 0.0 to 20.0 mg/L, 0.0 to 5.0 mg/L, 0.0 to 5.0 mg/L, and 0.0 to 5.0 mg/L, respectively. The spike recoveries were 95% to 105% and the relative standard deviations (RSDs) were 0.88% to 2.74% (n = 12). This method is suitable for determining Fe, Zn, Cu, and Mn in Osmanthus fragrans flower tea substitute.

Key words: microwave digestion, ICP-AES, Osmanthus fragrans flower tea substitute, Fe, Zn, Cu, Mn