Performance Characteristics of Hydrogen Peroxide Sensor Using Immobilized Manganese Dioxide Membrane

Abstract

In our previous paper, we reported a hydrogen peroxide sensor that used crude particles of MnO₂ immobilized in a polyvinyl chloride membrane attached on top of a dissolved oxygen sensor (Nagata et al., 2000). In this study we used MnO₂ particles of under 400 mesh for the sensor preparation. With this sensor, the effects of the coexistence of oxidizing substances and of various water preparations on the steady-state sensor response, R_s, were investigated. The results were as follows.
1) The use of fine MnO₂ particles of under 400 mesh improved the sensor sensitivity for H₂O₂ in distilled water to more than twice that of the sensor reported previously. The temperature dependency increased about 10% per 10 K as the temperature increased from 288 to 308 K, with the sensitivity at 298 K as 100%. 2) R_s values for oxidizing substances dissolved in distilled water were negligibly small. The coexistence of oxidizing substances with H₂O₂ in distilled water affected R_s values by less than 4%. For H₂O₂ dissolved in tap water, NaClO aqueous solution, or chlorine water, the R_s values were 4 to 11% lower than that for the distilled water solution of H₂O₂. For seawater solution of H202, the R_s values were almost equal to that of the distilled water solution of H₂O₂.