%0 Journal Article %T Determinaci車n de n赤quel en cereales y derivados mediante extracci車n y preconcentraci車n en l赤nea con detecci車n por EAA %A Yaneira Petit de Peˋa %A Wendy Rond車n %A Pablo Carrero %J Avances en Qu赤mica %D 2010 %I Universidad de los Andes %X Determination of nickel in cereals and derivates by on line extraction and preconcentration with AAS detection. An analytical methodology for the determination of nickel traces in commercial solid samples of cereals and corn flour was developed. Nickel was on-line extracted from solid samples in a lab-made cell incorporated to a flow injection system (FIA). After the extraction, a neutral chelate between nickel and ammonium pyrrolidinedithiocarbamate (APDC) was adsorbed on a minicolumn packed with zeolite type YNa. Finally, the chelate was eluted with methyl isobutyl ketone (MIBK) for nickel detection in a flame atomic absorption spectrometer. Under the optical conditions a preconcentration factor of 85 was readily achieved related to the direct introduction of aqueous solutions into an atomic absorption spectrometer. The detection limit (3考), RSD% and linear calibration graphs were 0.72, 0.22 and (30-70) 米g.l-1, respectively, for a sample volume of 6 ml. %K Solid samples %K Nickel %K YNa zeolites %K Preconcentration %K Cereals %K Corn %K Flours %U http://www.saber.ula.ve/bitstream/123456789/31542/1/ac1_5_2.pdf