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An improved ashing procedure for the determination of heavy metals in edible oils

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Journal of the American Oil Chemists’ Society

Abstract

An accurate, reliable, and simple method was described for the determination of Pb, Cu, Cd, Mn, Zn, an d Fe in edible oils by atomic absorption spectrophotometry following burning of the sample in a restricted air supply. Recoveries for the six heavy metals by the proposed methods were about 100%. The relative standard deviation of the analysis for the lead at the level of 0.074 ppm was 6%, and the copper at the levels of 0.064 ppm and 0.158 ppm were 7% and 2%, respectively. The recovery of lead was found to be suppressed by the presence of a large quantity of iron in the oil, but the suppression was alleviated by adding a Mg(NO3)2 solution to the charred residue before ashing.

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Authors and Affiliations

  1. Food Industry Research & Development Institute, PO Box 246, Hsinchu, Taiwan, R.O.C.

    Wei-Chong Tsai, Chia-Pao Lin, Lihwiuan Shiau & Shuh-Der Pan

Authors
  1. Wei-Chong Tsai
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  2. Chia-Pao Lin
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  3. Lihwiuan Shiau
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  4. Shuh-Der Pan
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Cite this article

Tsai, WC., Lin, CP., Shiau, L. et al. An improved ashing procedure for the determination of heavy metals in edible oils. J Am Oil Chem Soc 55, 695–698 (1978). https://doi.org/10.1007/BF02665364

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  • DOI: https://doi.org/10.1007/BF02665364

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