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Updated: Nov 21, 2025

Dynamic Electrochemical Measurement of Chloride Ions
Published on: February 5, 2016
Potentiometric Sensor Based on Carbon Paste Electrode for Monitoring Total Residual Chlorine in
Yaning Zhang1, Zhihui Li2, Xiaotong Guo2
1School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China.
Abstract:
A new potentiometric sensor based on modified carbon paste electrode (CPE) was prepared for the sensitive and selective detection of total residual chlorine (TRC) in simulated electrolytically-treated ballast water (BW). The modified CPE was prepared using ferrocene (Fc) as the sensing species and paraffin oil as the binder. It is revealed that the addition of Fc can significantly shorten the response time and improve the reproducibility, selectivity, and stability of the sensor. The open circuit potential of the Fc-CPE is in linear proportion to the logarithm of TRC within the TRC concentration range from 1 mg∙dm-3 to 15 mg∙dm-3. In addition, the Fc-CPE sensor exhibits good selectivity to TRC over a wide concentration range of the possible co-exiting interference ions in seawater. The Fc-CPE electrode can be used as a convenient and reliable sensor for the continuous monitoring of TRC during the electrolytic treatment of BW.
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