Characterisation of an impinging jet electrode in an amperometric detector by hydrodynamic voltammetry

Abstract

The electrochemical response in the limiting current region of an impinging jet electrode has been studied in a cell where the flow forms concentric rings, the streamlines being successively perpendicular, oblique and parallel to the electrode. The hydrodynamic voltammetric response of a laboratory-built amperometric detector, containing an impinging jet glassy carbon electrode, to a continuous stream of potassium hexacyanoferrate(II) in 1 M potassium chloride solution has been investigated. The response shows a gradual progression from thin-layer to wall-jet behaviour as the flow-rate is increased and is discussed in terms of a model together with other possible outcomes.