Computer-based automation of concentration measurements
with ion-selective electrodes |
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Authors: | josé A Iba?ez L Victoria Rafael M Barzanallana |
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Affiliation: | 1. Dept. Física Aplicada, Facultad de Ciencias Químicas y Matemáticas, Universidad de Murcia, Murcia, 30071, Spain.;2. Dept. Informática y Automática, Universidad de Murcia, Murcia, 30071, Spain, |
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Abstract: | An integrated computer system consisting of an expandable
ionanalyzer and a PC has been used to automate concentration
measurements with ion-selective electrodes (ISEs). The ionanalyzer
determines ionic concentrations using a reference electrode
coupled with an ISE. The measurements and calibrations are
carried out in a thermostated sample changer equipped with a flow
cell. The data obtained by the ionanalyzer are sent via a standard
RS 232-C interface to a microcomputer. In this paper, we describe
the automatic data acquisition system and the subsequent processing
of the measurements. One program (Transorion) automatically
collects the measurements carried out by the ionanalyzer, giving a
real-time graphic representation of the measurement on the
computer screen. A second program (Graforion) facilitates the
management of the data stored by the first program, and listing and
graphics of these can be obtained on the printer/plotter. The method
has been used to study continuous concentration changes in an
aqueous solution of potassium iodide. |
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