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Analytical method for determing copper in edible shortenings and oils

  • Technical
  • Published:
Journal of the American Oil Chemists Society

Abstract

A reliable, practical method was developed for the quantitative determination of sub-ppm levels of copper in edible shortenings and oils. Copper is quantitatively extracted with a boiling solution of 0.01% EDTA in 25% HCl. The extract was analyzed with 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (Bathocuproine), a highly specific and exceptionally sensitive reagent for the colorimetric determination of copper. An average recovery of 99.8% was obtained on 22 samples containing added oil soluble copper standards. A standard deviation of 0.002 ppm was established at the 0.05 ppm level during routine application of this method to a variety of shortenings and oils.

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Authors and Affiliations

  1. Winton Hill Technical Center, The Procter & Gamble Company, 45224, Cincinnati, Ohio

    Rudolph E. Deck & Kay K. Kaiser

Authors
  1. Rudolph E. Deck
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  2. Kay K. Kaiser
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Deck, R.E., Kaiser, K.K. Analytical method for determing copper in edible shortenings and oils. J Am Oil Chem Soc 47, 126–128 (1970). https://doi.org/10.1007/BF02640401

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  • DOI: https://doi.org/10.1007/BF02640401

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