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Micro-scale zinc determination in a specific medicine

By Oscar A. Díaz and Elida Alvarez


This work presents zinc determination in certain medicines that contain zinc oxide and zinc undecylenate. The technique consists of a spectrophotometric micro-scale titration, where EDTA is used as titrant, and xylenol orange as an indicator, in a medium adjusted to pH = 6 with acetic acid and sodium acetate. After each added portion of EDTA, the absorbance value is measured at a selected wavelength, in order to detect the end-point of the spectrophotometric titration. The results already obtained are satisfactory and promote student's interest. An additional contribution intends to propose the use of micro-scale techniques

Topics: spectrophotometric titration, EDTA, xylenol orange
Publisher: Sociedade Brasileira de Química
Year: 2004
OAI identifier: oai:scielo:S0100-40422004000500025
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