Jw. Lee et al., PULSED AMPEROMETRIC DETECTION OF METAL-IONS COMPLEXING WITH EDTA IN AFLOW-INJECTION SYSTEM, Bulletin of the Korean Chemical Society, 18(3), 1997, pp. 316-318
A general and universal detection method, which can be used in high pe
rformance liquid chromatography (HPLC) and flow injection analysis (FI
A) system for the determination of any metal ions complexing with ethy
lenediaminetetraacetic acid (EDTA), is demonstrated. Pulsed amperometr
ic detection scheme is applied in a now-through thin layer electrochem
ical cell at an Au working electrode. Fluctuation of peak current leve
l at the same flow rate of carrier solution is minimized at this solid
working electrode, whereas not at a dropping mercury electrode. Remov
al of dissolved oxygen can be omitted with this detection method, whic
h is a required step for cathodic detection methods. Also, a group of
metal ions can be determined selectively and indirectly with this dete
ction scheme.