A SENSITIVE KINETIC SPECTROPHOTOMETRIC DETERMINATION OF TRACES OF TUNGSTEN IN SOLUTION BASED ON ITS INHIBITORY EFFECT ON THE DECOLORIZATION REACTION OF POTASSIUM PERMANGANATE

Authors

Branka Petković

Faculty of Natural Science and Mathematics, Kosovska Mitrovica

Ružica Micić

Faculty of Sciences and Mathematics, University of Priština in Kosovska Mitrovica, Kosovska Mitrovica, Serbia

Ranko Simonović

Faculty of Natural Sciences and Mathematics, University of Priština, Kosovska Mitrovica

DOI 10.5937/univtho6-10437 Original page Cite this article

Keywords

4-hidroxycoumarine, tungsten(VI), inhibition, spectrophotometric determination, Kinetic method

Abstract

The present work describes a rapid and sensitive method for the determination of ultramicro amounts of tungsten (VI) based on its inhibitory effect on the oxidation of 4-hidroxycoumarine by potassium permanganate in the presence of hydrochloric acid. The sensitivity of the method is 20 ng/cm3. The probable relative error is -4.8-13 % for the W(VI) concentration range 250 to 20 ng/cm3, respectively. Kinetic equations for the investigated process which determine the order of the reactions regarding to each reaction parameter under certain experimental conditions were proposed, and they allowed quantification of the unknown concentrations W(VI) in solution. The detection and quantification limit of the method are 4.5 and 15.1 ng/cm3. The effects of certain foreign ions upon the reaction rate were determined for the assessing the selectivity of the method.

Published

2016/06/22

Issue

Vol. 6 No. 1 (2016)

Section

Original Scientific Paper

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