CHARACTERIZATION OF A WALL-JET ELECTRODE FLOW-INJECTION ANALYSIS SYSTEM

A ''wall-jet'' electrode (WJE) was studied as an electrochemical detec tor for flow-injection analysis (FIA). Mathematical expressions were o btained for the peak current responses of the electrode, both for an u ncoiled open tubular conduit and also in the presence of a packed-bed reactor between the injection valve and detector. The derived relation ships between peak current and volumetric flow rate, and injected samp le volume and concentration of the analyte were verified by using the ferricyanide ion and hydrogen peroxide as test samples. In general, th eory and experiment were in good agreement although a discrepancy in t he volumetric flow rate dependence of the peak current was observed in the presence of a packed-bed reactor.