Anodic stripping determination of Pt(IV) based on the anodic oxidation of In from electrochemically deposited Pt–In alloy phases

Abstract

A simple, rapid, and sensitive anodic stripping voltammetric method for the determination of Pt (IV) is described. It is based on depositing an intermetallic indium-platinum alloy phase on the surface of a modified graphite electrode, and recording the oxidation peak of indium from that alloy phase with the help of linear scan voltammetry. A systematic study of the behavior of different In-Pt phases revealed that the peak potential of indium oxidation from the different phases can be explained on the basis of simple thermodynamic considerations. Different alloy phases have characteristic peak potentials. For the purpose of analysis, it is possible to choose such conditions that only one specific alloy phase forms, viz. PtIn. This is the case for a concentration (milligrams per liter) ratio of In (III)/Pt(IV)050,000:1, at least.

Anodic stripping determination of Pt(IV) based on the anodic oxidation of Hg and Cd from electrochemically deposited Hg–Pt and Hg–Cd alloy phases

“…In the case of the In-Pt system [1], several intermetallic phases are formed that reduce the range of the concentration of platinum. For the Hg-Pt system, the concentration range of platinum order of magnitude is greater.…”

“…In a previous paper [1], we have shown that it is possible to determine Pt(IV) by recording the anodic stripping voltammograms of indium oxidation from deposited InPt alloy phases. The determination of platinum is carried out by means of anodic stripping voltammetric methods [2].…”

Anodic Stripping Determination of Pt (IV) Based on the Anodic Oxidation of Cu from the Intermetallic Phase of Cu3Pt

“…It is expected that the presence of other metals on the electrode surface forms one or more intermetallic compounds with these metals. Previously we have shown that the determination of platinum, if precipitating it together with indium, is possible 3,4 . In this paper we show the possibility to use copper as a metal activator.…”

Determination of Au, Pt, Pd in gold ore mineral raw materials by stripping voltammetry

“…Electro-deposition of platinum was conducted from solutions containing ions of indium (III). Determination of platinum was performed by a pick of selective electro-oxidation of indium from intermetallic compound with platinum [8,9]. To determine gold, a graphite electrode modified by bismuth was used [10].…”

“…Determination of platinum ions (IV) by the SV method is carried out by means of electro-deposition of these metals into an alloy with a less precious metal (activator metal) with the following selective electro-oxidation of the activator metal. There have been recorded instances of SV determination of platinum ions (IV) by picks of selective electro-oxidation of mercury [7] or indium [8,9] from intermetallic compounds with platinum.…”