Oxidation degradation of wastewater containing thiosemicarbazide by ClO 2 has been studied.The results indicate that thiosemicarbazide is degradated to the nontoxic inorganics,including SO 2- 4,N 2 and CNO -.It has been proved that the mass ratio of ClO 2 to thiosemicarbazide and pH influence the removal ratio of COD obviously,but reaction time and temperature have weak effect.When pH≤2,R=2.0 and reaction time is 15min,removal ratio of COD achieves the highest value at ordinary temperature.Removal ratio of COD of pesticide wastewater containing thiosemicarbazio is about 86.0% under such condition indicating that the degradation effect is good.
Indirect ion chromatographic method of thiosemicarbazide has been studied in this paper.Oxidation conditions of the certatin concentration thiosemicarbazide to sulfate have been concluded by orthogonal tests.Linear range of the method is 1.00～50.00mg·L -1 ,detectability is 0.5mg·L -1 ,the relative standard deviation is less than 5%,rate of recovery is 98.0～104%.It shows that the method is simple,accurate and sensitive for microdetermination of thiosemicarbazide.
