PULSED FLOW CHEMISTRY - A NEW APPROACH TO THE GENERATION OF CONCENTRATION PROFILES IN FLOW-ANALYSIS

Pulsed flow chemistry (PFC) is described as a new approach to automate d on-line analytical chemistry, In contrast to existing flow-based ana lytical chemistry methods, PFC is characterized by pulsed flow, turbul ent mixing and low axial dispersion. The PFC system is fully computeri zed and all operations are under software control, Consequently, most flow analysis methods (e.g., flow injection, continuous flow, flow tit ration, etc.) can be selected with a simple click of the mouse, The sy stem is easily miniaturized and portable which makes it particularly s uited to field instrumentation. The system has been tested using sever al flow-based techniques including on-line titration for-the determina tion of calcium in waters with potentiometric detection and a calcium ion sensor.