Potentiometric measurements in sequential injection analysis lab-on-valve (SIA-LOV) flow-system |
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| Authors: | Timo Kikas |
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| Affiliation: | a Process Chemistry Centre, c/o Laboratory of Analytical Chemistry, Åbo Akademi University, FIN-20500 Turku-Åbo, Finland
b Institute of Physical Chemistry, Tartu University, Tartu, Estonia |
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| Abstract: | Advantages of using sequential injection analysis lab-on-valve (SIA-LOV) in potentiometric measurements are studied with Ca2+ sensitive solid-contact ion-selective electrodes (SC-ISE) and pH electrode based on polyaniline (PANI). Experiments show that Ca2+-SC-ISE requires a stopped flow mode to be used in order to get longer equilibration time. On the other hand, PANI based pH electrode gives better results under flow conditions. SIA-LOV was found to be a flexible solution handling system for potentiometric measurements. The technique gives a possibility to fine-tune the calibration range or even recondition the electrode before every measurement without losing in linear range of calibration. |
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| Keywords: | Sequential injection Lab-on-valve Ion-selective electrodes |
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