Potentiometric Stripping Analysis at the Gel Stabilized Oil/Water Interface
No Thumbnail Available
Date
1994-06
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa Universty
Abstract
The application of potentiometric stripping analysis for the
determination of anions at gel stabi 1 i zed water /ni trobenzene
interface has been studied. A four electrode potentio-galvanostat
with differentiator circuit used to carry out the experiment was
constructed in our laboratory.
The performance of the gel stabilized nitrobenzene/water
interface was preliminary tested using cyclic voltammetry, phase
selective AC voltammetry, differential pulse voltammetry and
differential pulse stripping voltammetry. The ions studied
include ClO.- and N03-. The ion transfer across the gel/water
interface was found to be diffusion controlled under the
experimental conditions. The half wave potential difference
between two ions calculated was in good agreement with literature
data.
The influence of deposition time, current density and rest
period on the transition time, f, of the stripping step was
investigated. stripping times obtained in derivative mode were
found to be significantly longer than those obtained in the
normal mode (based on 99.9% confidence level). The simultaneous
determination of ClO.- and N03 - is possible by PSA and DPSA:
Description
Keywords
Oil and Water