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http://dx.doi.org/10.7735/ksmte.2012.21.5.720

Effectiveness of the Electrochemical Sensor for the Free Chlorine Measurement  

Kim, Hong-Won (숭실대학교 대학원 기계공학과)
Chung, Nam-Yong (숭실대학교 공과대학 기계공학과)
Publication Information
Journal of the Korean Society of Manufacturing Technology Engineers / v.21, no.5, 2012 , pp. 720-725 More about this Journal
Abstract
Sodium hypochlorite is used worldwide as a water disinfectant and in bleaching agent. Sodium hypochlorite applied to water initially undergoes hydrolysis to form free chlorine consisting of hypochlorous acid(HOCl) and hypochlorite ion($OCl^-$). For free chlorine determination, an electrochemical method is simple due to the electroactivity of free chlorine; it measures current and is free of most reagents. Amperometric free chlorine sensor has been developed with gold (Au)-based electrode. The 3-electrode free chlorine sensor whose working and counter electrodes were Pt exhibited excellent response to HClO at +400mV vs. Ag/AgCl/sat. KCl. In addition, the use of a pH error correction algorithm provided a reliable measurement of residual free chlorine in water sample without any pretreatment in the normal pH range(pH 6~8) of municipal water supply. The free chlorine sensor installed in on-line monitoring system could be used to continually monitor the level of residual free chlorine in real samples.
Keywords
Free residual chlorine; Electroanalytical method; Tree electrode system; Amperometry; Gold disk electrode;
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Times Cited By KSCI : 1  (Citation Analysis)
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