P2EC.12 - Potential Response of Passive Metal Electrodes to Free Chlorine in tap water
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
- P-2 - Electrochemical Sensors
- K. Okamura, N. Hirano, N. Yamasaku, S. Okazaki - Graduate School of Engineering, Yokohama National University, Yokohama City (Japan), Y. Tanaka, I. Hori, T. Gomei - R&D, Aichi Tokei Denki. Co., Ltd., Nagoya City (Japan)
- 723 - 724
For realizing an all-solid-state free chlorine sensor composed of two dissimilar electrodes,dependences of open-circuit potentials on free chlorine concentration in simulated tap water condition were evaluated for several metal electrodes. In this study, stainless steel, tungsten, tantalum, and titanium which are well known metals to form stable passive film on its surface were tested. Although each metal electrode showed different sensitivity, it was found that the electrodes can detect free chlorine in practical concentration range below 1 mg/L. Among them, stainless steel electrode exhibited relatively high sensitivity. This suggests that the appropriate combination of dissimilar metal electrodes enable us to measure free chlorine with high sensitivity and low cost.