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Kinetic methods based on the catalytic reaction have been reviewed for several anions. The methods are of extremely high sensitivity and selectivity, finding increasing application to trace analysis of materials of geochemical and environmental interest. The determination of iodine or nitrite is based on their catalytic effects on the color-fading of iron(III) thiocyanate complex in dilute nitric acid. The reaction allows the differential determination of iodide-iodine and iodate-iodine at trace level. Traces of bromide can be determined by its catalytic effect on the oxidation of iodine to iodate by permanganate in acid medium. The reaction(2NaN3+I2→2NaI+3N2) is catalytically promoted in the presence of sulfur compounds. This catalytic reaction leads to the development of sensitive methods for the determination of thiosulfate, thiocyanate and sulfide. Improved catalytic methods for cyanide and fluoride are also quoted.

Spectrophotometric determination of ultramicro amounts of anions by catalytic reactions.