Computer-based automation of concentration measurementswith ion-selective electrodes

[摘要] An integrated computer system consisting of an expandableionanalyzer and a PC has been used to automate concentrationmeasurements with ion-selective electrodes (ISEs). The ionanalyzerdetermines ionic concentrations using a reference electrodecoupled with an ISE. The measurements and calibrations arecarried out in a thermostated sample changer equipped with a flowcell. The data obtained by the ionanalyzer are sent via a standardRS 232-C interface to a microcomputer. In this paper, we describethe automatic data acquisition system and the subsequent processingof the measurements. One program (Transorion) automaticallycollects the measurements carried out by the ionanalyzer, giving areal-time graphic representation of the measurement on thecomputer screen. A second program (Graforion) facilitates themanagement of the data stored by the first program, and listing andgraphics of these can be obtained on the printer/plotter. The methodhas been used to study continuous concentration changes in anaqueous solution of potassium iodide.

[学科分类] 分析化学