An analytical method was established for microwave coupled with concentrated HNO3+30% (mass fraction) H2O2 digestion of sesame paste samples from Shaanxi region, and the contents of 15 mineral elements in the samples were detected online by inductively coupled plasma optical emission spectrometry (ICP-OES) synchronously. After optimizing the parameters of the instrument, the analytical line of each element and detection limit with 0.000 1 to 0.230 0 mg/kg were determined. Furthermore, a series of standard solutions with suitable concentrations were prepared, and then the standard working curves with correlation coefficients being greater than 0.999 5 were plotted. The results showed that there were 15 mineral elements in the samples, and the contents of Ca, P, Mg and Al were more than 1 000 mg /kg. Besides, Fe, Si and Zn were more than 100 mg/kg, while Cr was very little. At the aspect of relative standard deviation (RSD), the standard recovery tests were between 96.0% and 104.6%, and the determination results were ranged from 1.06% to 4.63%. The method has the advantages of low reagent dosage, high precision and accuracy, so it can be used for the determination of mineral elements in sesame paste.
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