Abstract
Polarographic determination of isosorbide dinitrate (ISDN) was performed in a flow injection system assembled from commercially available units. The detector could be operated either as a dropping mercury electrode or as a hanging mercury drop electrode. In addition to the influence of injection volume, coil length and pumping rate on sensitivity and peak widths, peak heights also depended on the presence of surfactants in samples and carrier stream. When a pump of high quality was used, the system was equal to a normal polarograph with regard to quality of results and ease of operation. The working range was 0.05–1 mM ISDN and the limit of detection 0.01 mM. The maximum sampling frequency was about 100 samples per hour. No deaeration of samples and carrier stream was required, because the carrier stream contained sodium sulfite in a slightly alkaline medium.
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