Versatile manifold for the simultaneous determination of ions in flow injection analysis

Abstract

A flow injection analysis system is described for the simultaneous determination of several ions in a single sample using a combination of potentiometric and spectrophotometric detection. A composite manifold has been designed consisting of a flow cell containing four ion-selective electrodes and two spectrophotometric transducer flow cells. The system has been applied to the determination of K⁺, Ca²⁺, NH₄⁺, Cl^–, NO₃^– and PO₄^3– ions in a number of plant nutrient solutions.