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Determination of heavy metals in a menhaden oil after refining and hydrogenation using several analytical methods

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Journal of the American Oil Chemists’ Society

Abstract

A series of menhaden oils collected at various stages of processing have been analyzed for zinc, cadmium, lead, copper and arsenic by wet digestion and electrothermal atomization-atomic absorption spectrophotometry (aas). The results are compared, for some metals, with 2 other methods of oil treatment: extraction with nitric acid and dilution with methyl isobutyl ketone. Both the extraction and dilution procedures appeared to measure only the loosely bound, inorganic portion of the metals: determination of the total metal content including organometallics required wet digestion. The crude oil contained the largest metal burden but successive refining steps reduced the metal content to a level which met the FAO/WHO Codex standards. Hydrogenation did not significantly alter the metal concentration in the oils.

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Author information

Authors and Affiliations

  1. Department of Chemistry, Saint Mary’s University, B3H 3C3, Halifax, Nova Scotia, Canada

    CM. Elson & E. M. Bem

  2. Fisheries Research and Technology Laboratory, Technical University of Noav Scotia, PO Box 1000, B3J 2X4, Halifax, Nova Scotia, Canada

    R. G. Ackman

Authors
  1. CM. Elson
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  2. E. M. Bem
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  3. R. G. Ackman
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Additional information

Presented in part at AOCS Annual Conference, New Orelans, May 1981

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Elson, C., Bem, E.M. & Ackman, R.G. Determination of heavy metals in a menhaden oil after refining and hydrogenation using several analytical methods. J Am Oil Chem Soc 58, 1024–1026 (1981). https://doi.org/10.1007/BF02679318

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  • DOI: https://doi.org/10.1007/BF02679318

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