Hydrogen peroxide sensor using immobilized maganese dioxide membrane

MnO2 was immobilized in polyvinyl chloride membrane. A hydrogen peroxide se nsor was set up by attaching the immobilized MnO2 membrane on top of a diss olved oxygen sensor of galvanic type. For comparison, sensors using catalas e were also set up with immobilized catalase membrane or particles. The sensor was dipped in a certain volume of distilled water at a given tem perature. Then, hydrogen peroxide aqueous solution of the fixed volume and concentration was added to the distilled water, and the response characteri stics and stability of the sensor were investigated. The results obtained are summarized as follows. 1) It is found that the MnO 2 membrane can be used as a membrane recognizing molecule for a hydrogen pe roxide sensor. 2) The steady response value of these sensors is proportiona l to H2O2 concentration. 3) The response rate of the sensor using immobiliz ed MnO2 membrane is the same as that of the sensor using immobilized catala se membrane. 4) When these sensors are stored in the distilled water at roo m temperature while not used, the sensor using MnO2 membrane shows stable r esponse for more than three months.