Abstract
A simple, rapid, and selective method for the fluorometric determination of zinc has been developed based upon the formation of the salicylaldehyde thiocarbohydrazone (SATCH-Zn(II)) complex. The reaction is carried out at pH 4.6-4.9 in an aqueous-ethanol medium (52% v/v ethanol). The detection limit is 10 ng/mL and the relative standard deviations are +/-1.65% (15-100 ppb zinc), +/-1.70% (100-500 ppb zinc), and +/-2.22% (500-1000 ppb zinc). The effect of interferences was studied. The method has been applied to the determination of zinc in biological samples (prior to destruction of the organic matter by using a HNO/sub 3/-H/sub 2/O/sub 2/ mixture), wine, and alloys.
Published Version
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