Potentiometric Titration of Vanadium (V) with Iron (II) in the Presence of NTA and DTPA Using Dry-Cell Graphite Electrode

Kavitha Kamalasekaran

doi:10.37358/rc.21.3.8445

Abstract

A sensitive potentiometric titration for vanadium (V) based effect of ligands such as nitrilotriacetic acid (NTA) and diethylenetriaminepenta-acetic acid (DTPA) are reviewed. The potential iron system decreased the presence of NTA and DTPA. In this case, iron (III) increased with respect to the vanadium (IV) volume. The production of iron (III)-ligand complex has increased. This result suggested that the formation of V(V)-NTA and V(V)-DTPA complexes were less favoured than that of V(IV)-NTA and V(IV)-DTPA complexes. The calculated correlation coefficients (r) conveyed the effectiveness of the graphite electrode as the indicator electrode for the potentiometric titrations. On comparing the potential jump values, the extent of potential caused by DTPA was found to be more than that of NTA. The utilization of graphite electrode has facilitated the potentiometric titration by significantly causing larger potential jump. This method was precise and accurate as no interference of foreign ions was observed. Hence, the approach could be applied to the vanadium (V) of any samples.

Highlights

The chemical speciation and the determination of a metal ion have demand in several researches such that environmental pollution, industrial control etc
Chemicals All reagents used on purification with 0.01 M ammonium iron (II) sulphate solution was prepared by dissolving 3.92 g of iron (II) salt in 0.05 M sulphuric acid and standardized against potassium dichromate solution. 0.01 M vanadium(V) solution was prepared by dissolving 6.10 g of sodium metavanadate salt in 50.0 mL of (1:1) sulphuric acid, water and it was standardized against Iron (II) solution. 0.5 M Nitrilotriacetic acid (NTA) and 0.5 M diethylenetriaminepenta-acetic acid (DTPA) solutions were dissolved in sodium acetate and diluted with water
Until all carbides were decomposed. An aliquot from this solution was taken, and 50-60 mL of 0.10 M DTPA solution was added followed by the addition of 2.0 M sulphuric acid solution in order to maintain the solution pH at 5.0 and the resulting solution was titrated with appropriately diluted ferrous ammonium sulphate solution using dry-cell graphite electrode and saturated calomel electrode

Summary

Introduction

The chemical speciation and the determination of a metal ion have demand in several researches such that environmental pollution, industrial control etc. The vanadium has development of titrimetric methods for the determination of vanadium (IV) and vanadium (V) state results since they have different toxic and nutritional properties [5,6]. This could be due to the reason that the complexing agents could potentially modify the ions [7]. In order to compare the performance of graphite electrode, we have performed the potentiometric titration using platinum electrode (for comparison purpose only) and confirmed the potential performance of graphite electrode This proposed method was anticipated to be highly sensitive and rapid as the graphite electrode enhanced the ease of end point detection at high pH values. The performed interference study conveyed that there was no any interference due to foreign ions

2.Materials and methods

Findings

4.Conclusions