Abstract：
: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 μg/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)×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 0.12μg/g, for 60mg of sample were achieved. The method was successfully applied to the determination of trace amounts of nickel in food samples.
journal_name
Food Chemjournal_title
Food chemistryauthors
Yebra MC,Cancela S,Cespón RMdoi
10.1016/j.foodchem.2007.11.019subject
Has Abstractpub_date
2008-05-15 00:00:00pages
774-8issue
2eissn
0308-8146issn
1873-7072pii
S0308-8146(07)01162-4journal_volume
108pub_type
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