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Contents of mineral elements in 13 edible vegetable oils
  
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KeyWord:edible vegetable oil  hemp seed oil  mineral element  wet digestion  atomic absorption spectrometry
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TAN Wei, LI Minyi, GUO Liyan，etc  
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Abstract:
      A method was developed for the determination of six mineral elements (Mg, K, Ca, Fe, Cu and Zn) in edible vegetable oils using wet digestion and atomic absorption spectrometry. The results showed that the optimal wet digestion conditions were obtained as follows: with HNO3-H2O2 as digestion solution, HNO3dosage 20.00 mL and heating power 500 W. The correlation coefficients (r) were higher than 0.998 in the linear ranges of six mineral elements. The limits of detection (LODs) of six mineral elements were 0.32-21.16 mg/kg. The recoveries of three edible vegetable oils were 82.9%-115.0%, with the relative standard deviations ranging from 1.1% to 8.8%. The contents of six mineral elements in 13 kinds of edible vegetable oils were studied by the established method, and the results showed that the nutritive value of hemp seed oil was higher with rich minerals.
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