SIMULTANEOUS DETERMINATION OF Cr, Ni AND V IN URINE BY ET AAS

SIMULTANEOUS DETERMINATION OF Cr, Ni AND V IN URINE BY ET AAS. A procedure for the simultaneous determination of Cr, Ni, and V in urine by electrothermal atomic absorption spectrometry (ET AAS) was optimized by factorial design, and performed at a pyrolysis and atomization temperatures of 1300 and 2500 degrees C, respectively, using 15 mu g de Mg(NO3)(2) as chemical modifier. Characteristics mass of 14, 6 and 220 rho g and detection limits of the method of 0.07, 0.38 and 0.75 mu g L-1 were obtained for Cr, Ni and V respectively. The methodology was validated using a Liphochek Urine Metals Control sample (Bio-Rad) (P=0.05). The methodology was applied to samples of voluntary Venezuelan people, not environmentally exposed to specific emissions, and results ranging from < LOD-1.1 and 1.3-3.3 mu g L-1 was observed for Cr and V, respectively, and not detectable levels for Ni.