1984 Volume 10 Issue 4 Pages 446-453
A new chemical actinometer has been developed which detects absolute light intensity in heterogeneous photoreactors where light reflection and dispersion are superimposed by dispersed phases.
Dilute potassium trisoxalatoferrate aqueous solution (concentration of 0.03 mol. m-3) containing 1, 10-phenanthroline, 0.135 moil·m-3, and potassium oxalate, 1.5 mol·m-3, was irradiated by 366 nm monochromatic parallel light in a temperature range from 20 to 40°C;and the photolysis of potassium trisoxalatoferrate was kinetically studied. Two parameters were determined in the derived reaction-rate equation in consideration of the effects of diffusions of reactants and products, and that of internal light filtering.
The absolute light intensity including the effect of reflection was measured in a cell-type batch reactor with a reflector, with using this aqueous solution (dilute potassium trisoxalatoferrate chemical actinometer, or DPOF chemical actinometer). A method is shown for determining the absolute light intensity in heterogeneous photoreactors with DPOF chemical actinometer having optical lengths for which internal light filtering is negligible.