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Spectrometric determination of iron and copper in vegetable oils after separation with Schiff base impregnated silica gel column: A simple approach for eliminating the high organic matrix
Author(s) -
Tokay Feyzullah,
Bağdat Sema
Publication year - 2015
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1111/ijfs.12948
Subject(s) - chemistry , copper , silica gel , extraction (chemistry) , ethylenediamine , elution , solid phase extraction , chromatography , matrix (chemical analysis) , detection limit , schiff base , sunflower oil , atomic absorption spectroscopy , analytical chemistry (journal) , inorganic chemistry , organic chemistry , biochemistry , crystallography , physics , quantum mechanics
Summary A simple solid‐phase extraction method has been described for the separation of Fe( III ) and Cu( II ) from liquid vegetable oils using N,N′‐bis(4‐methoxy salicylidene) ethylenediamine impregnated silica gel and the determination of these ions. The experimental parameters that affect the separation/preconcentration of ions were investigated by batch and column methods prior to the determination by flame atomic absorption spectrometry. Fe( III ) and Cu( II ) ions in 20.0 g portion of oil samples can be quantitatively sorbed and then eluted completely with 5.0 mL of 2.0 mol L −1 HNO 3 . Limits of detection were calculated as 22.8 and 13.9 μg kg −1 for Fe( III ) and Cu( II ), respectively. The repetition of the suggested method was checked by finding relative standard deviation for five repeated analyses, which was 1.5% for Fe( III ) and 0.1% for Cu( II ). Applicability of the method was controlled with spiked and unspiked sunflower, corn, canola, olive, soya and hazelnut oils.