Abstract
A kinetic-dual standard additions method for simultaneous determination of interfering binary mixtures is proposed, and the principles discussed. The deviations of the absorbance from additivity in kinetic systems, caused by a synergistic effect between the two catalysts, are effectively compensated with the defined synergistic catalytic coefficient. The hydrogen peroxide-iodide kinetic reaction catalyzed by molybdate and tungstate was studied with a stopped flow injection technique, and the conditions for simultaneous determination of molybdate and tungstate were established. Contents of molybdenum and tungsten in different samples were determined with proposed procedure, the recoveries were 97.6–102.1% and 96.9–98.6%, and the relative standard deviations were 2.3–3.4% and 1.6–2.6% respectively.
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