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Determination of heavy metals in a menhaden oil after refining and hydrogenation using several analytical methods
Author(s) -
Elson CM.,
Bem E. M.,
Ackman R. G.
Publication year - 1981
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02679318
Subject(s) - refining (metallurgy) , chemistry , zinc , nitric acid , cadmium , atomic absorption spectroscopy , methyl isobutyl ketone , arsenic , extraction (chemistry) , metal , dilution , copper , environmental chemistry , chromatography , inorganic chemistry , ketone , organic chemistry , physics , quantum mechanics , thermodynamics
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.