期刊
FOOD CHEMISTRY
卷 108, 期 2, 页码 774-778出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2007.11.019
关键词
ultrasound-assisted acid extraction; minicolumn preconcentration; flow injection analysis; nickel; food analysis
A new sensitive and low cost flow injection method that combines acid extraction, preconcentration and flame atomic absorption spectrometric determination of nickel in food samples at mu g/g levels is described. The dynamic acid extraction step was carried out by using a continuous ultrasound-assisted extraction system. The acid extract was preconcentrated on-line on a minicolumn packed with a chelating resin (Serdolit Che, with iminodiacetic groups) and nickel was eluted with diluted hydrochloric acid, being continuously monitored by flame atomic absorption spectrometry. An experimental design (Plackett-Burman 2(6) x 3/16) is used to optimise the methodology proposed. The method allowed a total sampling frequency of 13-28 samples per hour. Good precision of the whole procedure (1.9-3.6% expressed as relative standard deviation) and a detection limit of 0.12 mu g/g, for 60 mg of sample were achieved. The method was successfully applied to the determination of trace amounts of nickel in food samples. (C) 2007 Elsevier Ltd. All rights reserved.
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