A procedure, based on the standard additions method, has been developed for the direct determination of copper and iron in edible oils by flow injection flame atomic absorption spectrometry. An organic standard is added to the sample using a reverse single line manifold. The flow injection standard additions method allows the accurate determination of copper and iron in unrefined oil samples without any pre-treatment or dilution of the samples.
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Carbonell et al. (1991) studied this question.
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