Determination of copper, iron and nickel in edible oils using emulsified solutions by ICP-AES

Abstract

The determination of copper, iron and nickel in edible oils was carried out using emulsion sample preparation followed by analysis by ICP-AES. Response surface methodology was applied in order to find the optimum emulsion and surfactant concentrations. The optimum amount of oil in the emulsion was in the range ca. 2-35% in most of the surfactants studied, except for Triton X-100, which showed a maximum response above 35% oil. The surfactant concentration in the emulsion varied between 0.5 and 9%. Good agreement was found between calibration curves for emulsified aqueous standards solutions and oil-in-water emulsions for most elements studied with Tween 80, ethoxynonylphenol and Triton X-100. The best agreement for all elements was shown when Tween 80 was used. Hence emulsified aqueous standard solutions could be used for the determination of these elements in emulsified edible oil samples using ICP-AES. Recoveries ranged from 90 to 110% for most of the elements studied, with relative standard deviations lower than 8%. the use of surfactants to enhance the sample transport process.

Screening of in vitro bioactivities of a soy protein hydrolysate separated by hollow fiber and spiral-wound ultrafiltration membranes

“…The nebulization room was a cyclonic one, equipped with a Meinhard C type nebuliser. The wavelengths used to determine the concentrations of sodium, potassium, phosphorous, magnesium, copper and calcium were 589.592, 766.490, 213.617, 285.219, 327.393, 317.933 nm, respectively (Bazinet et al, 2000;Casademont, Sistat, Ruiz, Pourcelly, & Bazinet, 2009;Murillo et al, 1999). Analyses were subjected to one way analysis of variance (ANOVA), using SigmaPlot software (Version 11, Systat, Chicago, IL).…”

Metal Determinations in Olive Oil

“…Emulsification as sample preparation has been performed for the determination of trace metals in vegetable oils by ICP-OES (De Souza et al, 2005;Murillo et al, 1999), ICP-MS (Castillo et al, 1999;Jimenez et al, 2003), FAAS (List et al, 1971) and GF-AAS (Lendinez et al, 2001). Additionally, the use of microemulsion as sample preparation for vegetable oil analysis by High-Resolution Continuum Source FAAS (HR-CS FAAS) has been described by Nunes et al (2011).…”

“…The analytical techniques used for metal determinations in oils are both emission and absorption spectrophotometry. ICP-OES (Allen et al, 1998;Angioni et al, 2006 ;Anthedimis et al, 2005;Costa et al, 2001;De Souza et al, 2005;Murillo et al, 1999;Zeiner et al, 2005), FAAS (Batı & Cesur, 2002;Carbonell et al, 1991;Köse Baran & Bağdat Yaşar, 2010;Nunes et al, 2011), ETA-AAS (Karadjova et al, 1998;Kowalewska et al, 1999 ;Zeiner et al, 2005), GFAAS (Allen et al,1998 ;Ansari et al, 2009;Calapaj et al, 1988;Chen et al, 1999;Cindric et al, 2007;De Leonardis et al, 2000;Hendrikse et al, 1988Hendrikse et al, , 1991Lacoste et al, 1999;Martin-Polvillo et al, 1994 ;Matos Reyes & Campos, 2006;Mendil et al, 2009;Nash et al, 1983;Van Dalen, 1996), and ICP-MS (Benincasa et al, 2007 ;Bettinelli et al, 1995;Llorent-Martinez et al, 2011a, 2011bPereira et al, 2010;Wondimu et al, 2000) are the most commonly used techniques for the determination of metal contents in oils (Duyck et al, 2007).…”

Determination of Cu, As, Hg and Pb in vegetable oils by electrothermal vaporization inductively coupled plasma mass spectrometry with palladium nanoparticles as modifier

“…10 The concentration of the elements studied in the sample was quantified by means of 172 external calibration with 1 ng mL -1 of Rh as the internal standard. and ICP-MS [1]. In this study Triton X-100 was selected as the surfactant since it has 180 medium hydrophilic-lipophilic balance value [1].…”