Flame and graphite furnace atomic absorption spectrometry for trace element determination in vegetable oils, margarine and butter after sample emulsification

被引:34
作者
Ieggli, C. V. S. [1 ]
Bohrer, D. [1 ]
Do Nascimento, P. C. [1 ]
De Carvalho, L. M. [1 ]
机构
[1] Univ Fed Santa Maria, Dept Quim, BR-97110970 Santa Maria, RS, Brazil
来源
FOOD ADDITIVES AND CONTAMINANTS PART A-CHEMISTRY ANALYSIS CONTROL EXPOSURE & RISK ASSESSMENT | 2011年 / 28卷 / 05期
关键词
GFAAS; FAAS; metals analysis; AAS; quality assurance; nutrition; process contaminants; trace elements (nutritional); trace elements (toxic); oils and fats; olive oil; processed foods; EDIBLE OILS; OLIVE OIL; ICP-AES; COPPER; IRON; PLASMA; NICKEL; METALS;
D O I
10.1080/19440049.2011.555843
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Trace element analysis plays an important role in oil characterisation and in the detection of oil adulteration because the quality of edible oils and fats is affected by their trace metal content. In this study, the quantification of selected metals in various oils and fats (rice oil, canola oil, sunflower oil, corn oil, soy oil, olive oil, light margarine, regular margarine and butter) was carried out using flame atomic absorption spectrometry (FAAS) and graphite furnace atomic absorption spectrometry (GFAAS) after sample emulsification. FAAS was used to determine the Na, K, Ca, Mg, Zn and Fe levels in the samples, while GFAAS was used for quantifying Cr, Ni, As, Pb, Cd, Cu and Mn, as these elements appeared in the samples at much lower concentrations. Tween-80 and Triton X-100 were employed as surfactants, and emulsions were prepared by a conventional method that involved heating and mixing of the constituents. Complete stabilisation was achieved through magnetic stirring for 15 min at room temperature. The evaluated figures of merit were linearity, accuracy and sensitivity, which were determined by the characteristic concentration and mass. Analysis of spiked samples demonstrated accuracy, which ranged from 90% (Na) to 112% (Fe) for FAAS and from 83% (Cd) to 121% (Pb) for GFAAS measurements. Atomic absorption spectrometry proved to be a promising approach for the analysis of metals in emulsified edible oils and fats. Additionally, under appropriate emulsification conditions (formulation, stirring time and temperature), the emulsions were homogeneous, had excellent stability, and had appropriate viscosity. The proposed method has proved to be simple, sensitive, reproducible, and economical.
引用
收藏
页码:640 / 648
页数:9
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