| Abstract：A rapid and simple analysis method was investigated for determining the content of multi-trace metal element in edible vegetable oil. The contents of trace metal elements such as Mg, Al, K, Na, Ca, Fe, Cu, Zn, Sr and Mn in edible vegetable oil samples were determined using microwave plasma-atomic emission spectroscopy (MP-AES) after microwave assisted acid digestion. A large number of spectral interferences were avoided by selecting the analysis wavelength. The potential spectral interference and background interference were corrected by using fast linear interference correction (FLIC) technology. Y, La and Lu were selected as internal standard elements to correct the matrix effect. The accuracy of the method was evaluated by the spike recovery experiment and the comparative analysis with the results of inductively coupled plasma-mass spectrometry (ICP-MS). The results showed that the limit of detection of analyte was 0.12-4.29 μg/L, the spiked recovery rate was 95.4%-104.0%, and the relative standard deviation (RSD) was less than or equal to 4.1%. There was no significant difference between the analysis results of MP-AES and ICP-MS. The developed method had the characteristics of low cost, low limit of detection and good accuracy, and it could be applied to the determination of multi-trace metal element in edible vegetable oil. |
