A analytical method to determine metal elements in edible nut oil by microwave plasma atomic emission spectroscopy (MP-AES) was proposed. After the pretreatment of edible nut oil sample by microwave, the eight metal elements including Na, Mg, K, Cu, Fe, Zn, Mn and Ba in the digestion solution were determined by MP-AES. The spectral interference was eliminated by selecting the appropriate wavelength of analyte as the analysis line. The physical interference was eliminated by selecting Y, La, Lu as internal standard elements. The accuracy of the method was evaluated by spiked recovery experiment combined with inductively coupled plasma mass spectrometry (ICP-MS) comparative analysis. The results showed that the linear relationship of analyte was good and the linear correlation coefficient was ≥ 0.999 2. The method detection limit (MDL) was 0.02-0.12 μg/g, the spiked recovery was 90%-110%, and the relative standard deviation (RSD) was less than 5.9%. The MP-AES was used to test the actual samples and the analytical results were consistent with ICP-MS. The method is simple, rapid, accurate and reliable, which provides methodological method for the determination of Mg, Na, K, Cu, Fe, Zn, Mn and Ba in edible nut oil.
ZHANG Ping
,
LIU Hongwei
. Determination of metal elements in edible nut oil by microwave plasma atomic emission spectroscopy[J]. Food and Fermentation Industries, 2020
, 46(18)
: 215
-218
.
DOI: 10.13995/j.cnki.11-1802/ts.024303
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