Research Article
Determination of Quantum Yield for the Photochemical Decomposition of Dichloramine-B and Dibromamine-B in Aqueous Acetic Acid Medium
K. N. MOHANA, N. PRASAD and P. M. RAMADAS BHANDARKAR
ABSTRACT
The photolysis of dihaloamines (RNX2), viz., dichloramine-B (DCB) and dibromamine-B (DBB) in aqueous acetic acid (1:1 v/v) solutions has been studied with the UV light source (l = 2537 Å). The experimental rate law obtained is – d [RNX2] / dt = k' Io / [RNX2], where Io is the intensity of incident light. The addition of benzenesulphonamide, the product of photolysis or uranyl ion had no significant effect on the rate of photochemical decomposition. A slight decrease in the rate has been observed by the addition of NaCl / NaBr to DCB / DBB solutions. The quantum yield (f) for the photolytic decomposition has been computed. A suitable photolytic mechanism and a rate law consistent with the observed results have been proposed.
Received 14 April 2007; Accepted 30 May 2007