In our previous paper, we reported a hydrogen peroxide sensor that used crude particles of MnO
2 immobilized in a polyvinyl chloride membrane attached on top of a dissolved oxygen sensor (Nagata
et al., 2000). In this study we used MnO
2 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,
Rs, were investigated. The results were as follows.
1) The use of fine MnO
2 particles of under 400 mesh improved the sensor sensitivity for H
2O
2 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)
Rs values for oxidizing substances dissolved in distilled water were negligibly small. The coexistence of oxidizing substances with H
2O
2 in distilled water affected
Rs values by less than 4%. For H
2O
2 dissolved in tap water, NaClO aqueous solution, or chlorine water, the
Rs values were 4 to 11% lower than that for the distilled water solution of H
2O
2. For seawater solution of H202, the
Rs values were almost equal to that of the distilled water solution of H
2O
2.
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