A simple and direct spectrophotometric method for the determination of iron in vegetable oils has been developed. The proposed method is based on the aqueous 1,10‐phenanthroline method, where propionic acid is used as solvent for the vegetable oils and the iron(II) 1,10‐phenanthroline complex is formed directly in propionic acid with an absorption maximum at 514 nm.
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Lau et al. (1982) studied this question.
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