Related Experiment Video
Updated: Jun 28, 2026

Dynamic Electrochemical Measurement of Chloride Ions
Published on: February 5, 2016
Sequential injection with lab-at-valve (LAV) approach for potentiometric determination of chloride
Jaroon Jakmunee1, Lop Patimapornlert, Siripat Suteerapataranon
1Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; Institute for Science and Technology Research and Development, Chiang Mai University, Chiang Mai 50200, Thailand.
Abstract:
Sequential injection with "Lab-at-Valve (LAV)" approach is demonstrated for potentiometric determination of chloride. The LAV flow-through electrode system consists of two Ag/AgCl electrodes: one as a reference electrode, silver chloride activated surface-silver wire soaked in a constant-concentration chloride ion solution in a small tube covered with a polymer-membrane, another as a working electrode (a similar silver chloride activated surface-silver wire) placed in a flow channel. The electrode system is attached at one port of a 10 port multiposition valve. A modified autoburette was used as a propelling device. Using SI operation via a program written in-house, based on LabVIEW((R)), a standard/sample is inserted, via the selection valve, in potassium nitrate as an electrolyte and water is used as a carrier. The zones are transported from the holding coil to the flow cell to monitor the difference in potential due to concentration cell behavior. The potential difference is then recorded as a peak. Peak height is proportional to logarithm of chloride concentration. The SI-LAV for chloride determination is very simple, fast, precise, accurate, automatic and economical. Applications to mineral drinking water and surface water have been made. The results agree with those of IC and titrimetric methods.
More Related Videos
Related Concept Videos
High-Performance Liquid Chromatography: Elution Process
Controlled-Current Coulometry: Overview
Gas Chromatography: Sample Injection Systems
Two primary injection methods are used...
Controlled-Potential Coulometry: Electrolytic Methods
The chosen potential ensures...
Precipitation Titration: Endpoint Detection Methods
In the Volhard method, a standard excess of AgNO3 is first added to the...
Potentiometry: Overview

