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

1981; Wiley; Volume: 58; Issue: 12 Linguagem: Inglês

10.1007/bf02679318

1558-9331

CM. Elson, Eduardo Z�rate M, R. G. Ackman,

Chemical and Physical Properties in Aqueous Solutions

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.