Abstract: A wall jet type of electrochemical detector flow cell was constructed and tested in an amperometric and in a potentiometric detection system. In the amperometric detection system the test compound, glucose, was electrochemically oxidized at the working electrode. In combination with a simple flow injection analysis system the lower limit of detection was 20 p.p.m. of glucose whereas the upper limit of the linear dynamic response range was about 2000 p.p.m. of glucose.Using the potentiometric detection system, the change in redox potential of an Fe(CN)63--Fe(CN)64- solution, owing to the chemical oxidation of glucose by Fe(CN)63-, was measured. The response of the detection system at solutions with different [Fe(CN)63-] to [Fe(CN)64-] ratios was almost Nernstian. In a nitrogen segmented continuous flow analysis system, using Fe(CN)63- as the oxidising agent, a dynamic response range of 2-900 p.p.m. of glucose was measured.For the amperometric and potentiometric detection system different response times and volumes were measured as a function of the flow-rate and the nozzle height in the flow cell.

Abstract: A review with 25 references. The redox potential of systems involving metal ions has been modified by the complexation with suitable ligands. This phenomenon can be potentially used for the development of novel redox systems for quantatitive analysis. Potentiometric titrations of metal ions in the presence of suitable ligands are presented. Development of spectrophotometric methods and complexing agents for metal ions is possible by using ligand effect in redox systems. Applications to estimation of complexing capacity in natural water and to catalytic method for copper(II) are demonstrated. Potentiometric flow titration methods are discussed.