COBALT DETERMINATION IN BOVINE LIVER BY GFAAS - TESTING 2 ACID DIGESTION PROCEDURES AND DIFFERENT MODIFIERS

Two acid digestion procedures and several modifiers were tested to det ermine cobalt in bovine liver by GFAAS. The use of modifiers [Mg(NO3)2 , Pd(NO3)2, and Mg(NO3)2 + Pd(NO3)2] did not contribute to analyticall y significant enhancements in pyrolysis temperature, but led to an ove r-compensation error with the D2 background correction. The optimized procedure with a pyrolysis temperature of 1200-degrees-C, without modi fier, and a cooldown step before atomization, allowed the calibration with aqueous analytical solutions. Use of the L'vov platform proved ad visable. The results of both digestion procedures were in good agreeme nt with the certified value in the analysis of a standard reference ma terial.