Simultaneous kinetic determination of mixtures of ions by digital analysis of amperometric or potentiometric data

Abstract

Electroanalytical techniques allow the kinetic determination of concentrations of ions in their mixtures when the reactions used proceed at sufficiently slow velocity. Amperometry and potentiometry with digital data acquisition and treatment have been used for determinations of calcium and magnesium ions based on the exchange reactions between lead(II) and alkaline earth metal complexes of (trans-1,2-cyclohexylenedinitrilo)tetraacetic acid. Over a concentration range of 10^–4–5 × 10^–7M precision and accuracy are about 5–10% in amperometry and 5% in potentiometry.