Multivariate optimization of ultrasound-assisted extraction for determination of Cu, Fe, Ni and Zn in vegetable oils by high-resolution continuum source atomic absorption spectrometry

作者：Trindade Alex S N; Dantas Alailson F; Lima Daniel C; Ferreira Sergio L C; Teixeira Leonardo S G^*

来源：Food Chemistry, 2015, 185: 145-150.

DOI：10.1016/j.foodchem.2015.03.118

• Vegetable oil
• Determination of metals
• HR-CS FAAS
• Multivariate optimization

An assisted liquid-liquid extraction of copper, iron, nickel and zinc from vegetable oil samples with subsequent determination by high-resolution continuum source flame atomic absorption spectrometry (HR-CS FAAS) was optimized by applying a full factorial design in two levels and the response surface methodology, Box-Behnken. The effects of the acid concentration and the amplitude, cycle and time of sonication on the extraction of the analytes, as well as their interactions, were assessed. In the selected condition (sonication amplitude = 66%, sonication time = 79 s, sonication cycle = 74%), using 0.5 mol L-1 HCl as the extractant, the limits of quantification were 0.14, 0.20, 0.21 and 0.04 mu g g(-1) for Cu, Fe, Ni and Zn, respectively, with R.S.D. ranging from 1.4% to 3.6%. The proposed method was applied for the determination of the analytes in soybean, canola and sunflower oils.

• 出版日期2015-10-15