Kinetic determination of tellurium based on its inhibitory effect on the palladium(II)-catalysed reaction between pyronine G and hypophosphite ion
Abstract
A kinetic method for the determination of Te based on its inhibitory effect on the PdII-catalysed reaction between pyronine G and H2PO2– is described. The influence of experimental variables on the rate of the process and the potential interfering effect of a large number of ions has been studied. Under the selected experimental conditions: 6 × 10–5M pyronine G; 0.6 M H2PO2–; pH 2.6, adjusted with Britton-Robinson buffer; 0.80 µg ml–1 of PdII; and a temperature of 22 ± 0.2 °C, Te was determined in the concentration range 0.08–0.85 µg ml–1. The method was applied to the determination of Te in waters and lead concentrates.