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Determinación de cinc a microescala en un medicamento especifico

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
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