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Spectroscopy Letters
An International Journal for Rapid Communication
Volume 35, 2002 - Issue 3
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Original Articles

SPECTROPHOTOMETRIC DETERMINATION OF ZINC IN PHARMACEUTICAL SAMPLES USING DI-2-PYRIDYL KETONE SALICYLOYLHYDRAZONE

Ivanise Gaubeur Instituto de Química, Universidade de São Paulo, Cx. Postal 26077, São Paulo, 05513–970, Brasil
,
Madalena C. da CunhaAreias Instituto de Química, Universidade de São Paulo, Cx. Postal 26077, São Paulo, 05513–970, Brasil
,
Lúcia Helena S. Ávila Terra Instituto de Química, Universidade de São Paulo, Cx. Postal 26077, São Paulo, 05513–970, Brasil
&
Maria Encarnación V. Suárez-Iha Instituto de Química, Universidade de São Paulo, Cx. Postal 26077, São Paulo, 05513–970, BrasilCorrespondence[email protected]
Pages 455-465 | Received 15 Feb 2001, Accepted 20 Jan 2002, Published online: 01 Sep 2006
 
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ABSTRACT

A highly sensitive procedure for spectrophotometric determination of zinc has been developed. At pH 4.5, in 50% (V/V) ethanol-water medium and in the presence of di-2-pyridyl ketone salicyloylhydrazone (DPKSH), zinc forms a yellow complex which has maximum absorption at 376 nm The molar absorptivity is 4.82×104 L mol−1 cm−1. The detection limit of this method is 62.1 nM for Zn(II).

The method has been applied to the spectrophotometric determination of zinc in pharmaceutical formulations and the results comply with those obtained by AAS. The proposed method is simple, rapid and accurate.

ACKNOWLEDGMENTS

The authors are grateful to FAPESP and CNPq for the financial support.

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