Adsorptive stripping voltammetry of In(III) in the presence of pyrogallol red in chloride-acetate media

In this work optimal working conditions were established for the adsorptive stripping analysis of In(III) on a hanging mercury drop electrode with pyrogallol red as the preconcentration agent in chloride-acetate media using staircase and square-wave voltammetry (SCV and SWV). The influence of ligand adsorption and concentration, supporting electrolyte and pH on the voltammetric response was studied. From these results the stoichiometric ratio of the complex and the value of its corresponding formation constant were determined. Under optimized chemical and instrumental conditions limits of detection (3σ) of 7.0 × 10−9 M and 4.0 × 10−9 M were obtained for SCV and SWV, respectively, using a deposition time of 90 s. The relative standard deviations (n = 21) were 3.3 and 4.8 % for a 1.5 × 10−7 M In(III) concentration. The results of an analysis carried out for indium present in aluminum alloys were in good agreement with those obtained using ICP-AES as an alternative method.

Bibliographic Details

Main Authors:	Aguilar,J. C., Rodríguez de San Miguel,E., de Gyves,J.
Format:	Digital revista
Language:	English
Published:	Sociedad Química de México A.C. 2001
Online Access:	http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0583-76932001000100004
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