A wall jet flow-through detector for the sensing of quinine and paraquat ions

This article reviews the use of a wall-jet type flow-through detector for the potentiometric determination of quinine and paraquat ions, respectively, undertaken within our research laboratories. The detector allows the evaluation of the analytical response characteristics of the poly(vinyl chloride)-based membranes to be done in the flow injection analysis mode. Such ion-selective electrode membranes, containing either ion-exchangers or neutral carrier type of electroactive component, in conjunction with appropriate plasticizing solvent, and sometimes other membrane additive as was the case for paraquat selective membranes, can be conveniently applied to the detector assembly. Utilization of the flow-through detector allows studies on the sensing of the antimalarial drug, quinine, and the herbicide, paraquat, to be conducted conveniently. Details of the flow-through detector and its performance when used for the determination of the respective ion of interest under different matrices are described. © 2000 John Wiley & Sons, Inc. Lab Robotics and Automation 12:133–137, 2000