Zinc and nickel determination in liquid edible oils by FAAS after the extraction

Abstract

A new method has been developed for the extraction and determination of zinc and nickel in liquid edible oils by using the complexation of these metals with [N,N 0 -bis(salicylidene)-2,2 0 -dimethyl-1,3propanediaminato]. Zn(II) and Ni(II) complexes with a tetradentate Schiff base have been investigated spectrophotometrically. Experimental extraction conditions for these metals from liquid oil standards were optimized using central composite design. Optimum conditions for Zn(II) and Ni(II) extractions from oil have been found close to each other. The ratio of the volume of used Schiff base solution to the amount of oil (V LDM /m oil ; mL/g), the stirring time and the temperature were round about 1.00 mL/g, 55 min, 328C, respectively, for simultaneous determination of both metals in same sample. The recovery percentages at the optimum experimental conditions were found 98.9 AE 2.8 and 101.8 AE 4.7 for Zn(II) and Ni(II), respectively. The proposed method was applied on the raw and spiked samples such as olive oil, sunflower oil, corn oil, canola oil and obtained recovery values were between 93.7-107.2 and 93.1-101.1% for Zn(II) and Ni(II), respectively.Practical applications: There is interest in the determination of metals in liquid edible oils because of their catalytic effect on the oxidation reaction of oils. A new method for the determination of Zn(II) and Ni(II) in liquid edible oils which does not require any digestion or decomposition was developed. This study offeres a cheap, rapid, accurate, sensitive, risk-free, and practical metal determination method after the extraction.Abbreviations: AAS, atomic absorption spectrometry; ICP-AES, inductively coupled plasma atomic emission spectrometry; FAAS, flame atomic absorption spectrometry; LDM, [N,N 0 -bis(salicylidene)-2,2 0dimethyl-1,3-propanediaminato]; LOD, limit of detection 1320Eur.

Quantitation of Metals During the Extraction of Virgin Olive Oil from Olives Using ICP‐MS after Microwave‐assisted Acid Digestion

“…Several methods have been proposed for the determination of metals in olive oil [6][7][8][9][10][11][12] and other vegetable edible oils [8][9][10][12][13][14][15][16][17]. The most widely used detection techniques are inductively coupled plasma-atomic emission spectrometry (ICP-AES) [6,10,13,16], inductively coupled plasma-mass spectrometry (ICP-MS) [7,8,11,12], and flame and graphite furnace atomic absorption spectrometry (FAAS, GF-AAS) [6,9,10,14,15,17]. However, only a few methods have been proposed for the determination of metals in olive fruits, making use of ICP-MS [18], FAAS and GF-AAS [17,19,20], and ICP-AES [21].…”

Spectrometric Determination of Copper in Edible Oil Based on the Extraction with N,N′-bis(5-methoxy-salicylidene)-2-hydroxy-1,3-propanediamine

“…There have been some researches dealing with the analytical applications with the Schiff bases (Ghaedi et al, 2009;Kara et al, 2009;Köse Baran and Bağdat Yaşar, 2012b;Topuz and Macit, 2011). Analytical methods for the determination of copper (II), iron (III), zinc (II) and nickel (II) in edible oils based on the extraction with a Schiff base have been presented in our previous studies (Köse Baran and Bağdat Yaşar, 2010;2012a;2012b).…”

Determination of Iron and Copper in Edible Oils by Flame Atomic Absorption Spectrometry After Liquid–Liquid Extraction

“…Neutron activation analysis (NAA) [12] and graphite furnace atomic absorption spectrometry (GFAAS) [3,5] has been used to analyze edible oils requiring no sample preparation. However, such expensive instrumentation is not commonly available.There have been many reports about Schiff bases and related complexes for the determination of certain metals in biological, clinical, nutritional, environmental and industrial samples [13][14][15][16][17][18][19][20][21]. In the present work, a new method was improved for the determination of Fe(III) and Cu(II) in edible oils without any digestion procedure.…”

“…Most of these detection techniques require sample pretreatments involving the addition of one or more organic reagents, extraction with acids or acidic mixtures, wet digestion or dry ashing for eliminating the matrix effect. However, such expensive instrumentation is not commonly available.There have been many reports about Schiff bases and related complexes for the determination of certain metals in biological, clinical, nutritional, environmental and industrial samples [13][14][15][16][17][18][19][20][21]. Neutron activation analysis (NAA) [12] and graphite furnace atomic absorption spectrometry (GFAAS) [3,5] has been used to analyze edible oils requiring no sample preparation.…”