The stability measurement of chlorine dioxide solution

Objective To determine the stability of chlorine dioxide solution and provide a technical basis to disinfection procedures for mouth impression. Methods Five-step iodometry was used to determine the concentration of chlorine dioxide, and UV-spectrophotometry was applied to detect the stability of chlorine dioxide solution. Results Over a half-year period, non-activated raw solution of chlorine dioxide degraded by 2.01% at 4℃ and by 2.65% at 25℃, as shown by comparative measurements. At room temperature, 0.05% activated chlorine dioxide solution degraded by 8.56% at 12 hours after preparation. Conclusion Non-activated chlorine dioxide solution appeared to be more stable at low temperature than at room temperature. Activated chlorine dioxide solution for disinfection of mouth impression should be prepared at service time.