Micro Column Preconcentration-GFAAS Determination of Trace Amounts of Molybdenum

A micro column packed with phenylfluorone coated fiber of filter paper was prepared. Mo(Ⅵ) can be quantitatively adsorbed on the micro column at pH 2.0 with flow rate of 2.0 mL·min-1 and eluted from the column with 2.0 mL of aqueous ammonia (3+97) at flow rate of 1.0 mL·min-1. Amount of saturated adsorption of Mo(Ⅵ) on the column was 25.2 μg·g-1. Accuracy of the method has been verified via the analysis of the standard reference materials GSS 5 and GSR 1. Detection limit of the method was 1.01 μg·L-1 and recovery was in range of 92.0%-103.0%. The method has been applied to the determination of traces of molybdenum in simulated samples of Zn and copper concentrates.