A new chelating reagent and application for coprecipitation of some metals in food samples by FAAS

• Published in: Food chemistry 2016-03, Vol.194, p.143-148
• Main Authors: Yıldız, Esra, Saçmacı, Şerife, Kartal, Şenol, Saçmacı, Mustafa
• Format: Article
• Language: English
• Subjects: Chelating Agents - chemistry; Chelating reagent; Coprecipitation; Flame atomic absorption spectrometry; Food samples; Food Technology; Metals, Heavy - analysis; Metals, Heavy - chemistry; Spectrophotometry, Atomic - methods; Trace element
• ISSN: 0308-8146; 1873-7072
• DOI: 10.1016/j.foodchem.2015.07.084

•A new procedure for determination of trace species in food samples is developed.•The procedure was firstly used.•The method is an effective and offers a useful preconcentration technique. A new, simple and rapid coprecipitation method has been developed to separate and preconcentrate traces of Co(II), Cu(II), Fe(III), Pb(II) and Mn(II) in different samples prior to their determinations by flame atomic absorption spectrometry (FAAS). 2-[(E)-(8-hydroxy-2-methylquinolin-5-yl) diazenyl] benzoic acid (QAN) was firstly synthesized and characterized as a new chelating reagent for determination of some metals. IR spectra, 1H-NMR spectrum and elemental analysis were evaluated for the characterization of the reagent. These metals were quantitatively recovered with Ni(II)/QAN precipitate in pH range of 8–10. Different factors such as sample volume, amount of QAN, and Ni(II) as carrier element, sample volume, and matrix effects for improving the quality of the preconcentration procedure were optimized. Under optimized experimentally established conditions, analytical detection limits were in the range of 0.03–0.83μgL−1, while precision (RSD) was 95%).