Catalytic fluorimetric determination of nanogram amounts of lead in plastic containers for food by oxidation of pyridoxal 2-pyridylhydrazone with hydrogen peroxide
- 1 January 1984
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 109 (5) , 597-599
- https://doi.org/10.1039/an9840900597
Abstract
A kinetic fluorimetric method for the determination of trace amounts of lead(II) is described. It is based on the catalytic action of this ion in the oxidation of pyridoxal 2-pyridylhydrazone by hydrogen peroxide, which yields a product exhibiting an intense blue fluorescence in basic solution (λex.= 355, λem.= 425 nm). The kinetics of the chemical reaction are followed by the fluorescence intensity versus time graphs. Using several kinetic methods (tangent, fixed-time and fixed-intensity), Pb(II) at the 0.05–0.40 µg ml–1 level can be determined. The proposed method suffers few interferences and has been applied satisfactorily to the determination of lead in plastic containers for food.Keywords
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