Abstract
The kinetics of photoreduction of potassium ferrioxalate in the presence of ammonium molybdate was studied at 365/6mμ. Measurements were made in a batchwise and parallel-beam reactor operated at atmospheric pressure and at room temperature. The concentrations of potassium ferrioxalate and ammonium molybdate were changed from 6.17×10-8 to 3.45×10-6 and from 2.94×10-8 to 5.07×10-6 mol/cm3, respectively. The decrease in the reaction rate can be explained by the mechanism in which addition of ammonium molybdate causes both deactivation and inner filter.
The ratio of the rate constant of deactivation, k2, to that of the forward reaction, k1, was 12.5 at 365/6mμ.
The effect of the inner filter accompanied by addition of a substance on conversion is negligible when the optical thickness of all absorbing substances, τ(c+μ*), is very much smaller than 1.
