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Multivariate optimization of ultrasound-assisted extraction using Doehlert matrix for simultaneous determination of Fe and Ni in vegetable oils by high-resolution continuum source graphite furnace atomic absorption spectrometry

Author:
Almeida, Jorge S., Santos, Gabriel L., Brandão, Geovani C., Korn, Maria G.A., Teixeira, Leonardo S.G.
Source:
Food chemistry 2019 v.273 pp. 130-135
ISSN:
0308-8146
Subject:
acetic acid, atomic absorption spectrometry, chemical species, hydrochloric acid, iron, nickel, solvents, sonication, temperature, ultrasonic treatment, vegetable oil
Abstract:
A method for simultaneous determination of Fe (232.036 nm) and Ni (232.195 nm) in vegetable oil samples by high-resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GF AAS) after an acid extraction of the analytes is proposed. In the extraction step, hydrochloric, nitric and acetic acid solutions were tested. The optimization of the procedure was performed by applying Doehlert matrix, and multiple response was used for simultaneous evaluation of the performance of the extraction. The optimum conditions were: extraction time of 17 min, extraction temperature of 39 °C and sonication amplitude of 42%, employing 0.5 mol L−1 HCl as the extracting solvent. The limits of quantification were 60 and 160 ng g−1 for Fe and Ni, respectively. The method was applied to the analysis of vegetable oil samples and the results were compared with a method employing inductively coupled plasma optical emission spectrometry (ICP OES).
Agid:
6161139