Chlorine Dioxide And Its Inorganic By-products In Drinking Water, The Decay Law Of A Preliminary Study

In order to find an accurate determination of chlorine dioxide and inorganic ion-product approach,a standard solution of chlorine dioxide preparation,prepared by Asia sodium chlorate chlorine dioxide and its purification and then study cresol red SpectropHotometry and five-step iodimetry ClO₂ and in the determination of a single ClO₂ its by-products and inorganic ions at the conditions of use,interfering factors,such as the detection limit and precision.In order to arrive at different temperatures,pH,the initial concentration of chlorine dioxide and inorganic ion-product of chlorine dioxide and changes of the dynamic equation to study the different temperatures(15℃,25℃,35℃,45℃),different pH value(4.5,5.5,6.5,7.5) under the conditions of different initial concentration ClO₂ solution ClO₂,ClO₂^-, ClO₃^-changes in laws,and at room temperature for a water plant running the dynamic simulation experiments.With the growth of time,ClO₂ solution ClO₂ is a declining trend,and in early fall quite fast,late changes gradually slow.ClO₂^-the trend did not significantly change the law,Cl₂ initially showed no regularity,but obviously the latter part of a trend.Is not aheady measured or no law,but in the latter part of a future has shown a rising trend.As the temperature rises,ClO₂ the degradation faster,Cl₂ a clear point ahead of the growth trend,the greater the temperature,ClO₃^-the sooner there.PH value is,the degradation of slope is,the faster the rate of degradation.Administration of the 0.5～1.0 mg/L,10 h stay more reasonable, so drinking water can meet the state standards for limits,effective disinfection and by-product ion of the relatively small amount will be many.Through dynamic analysis,by the degradation of chlorine dioxide reaction order tbr the 3/2,chlorine dioxide degradation of the general formula for dynamic equation v=kc^3/2 (mol·L^-1·h^-1).With the constant speed of response to the increase of temperature increase in the same temperature gradient,the greater the temperature,the reaction rate constant k bigger increases.The same temperature,the initial reaction speed with the initial concentration of the increase,the greater the initial concentration,the greater the initial reaction speed.As the temperature increases,the initial reaction rate on the rise.This study pure solution of chlorine dioxide in the degradation of the activation energy in 53.4～77.9kJ/mol,at room temperature can occur under the conditions of their own degradation.Therefore,the application of chlorine dioxide disinfection,consideration should be given the degradation of its own to determine the chlorine dioxide dosage,consideration should be given a certain cushion.