Preparation of chloride ion selective electrode and its potential response to different chloride solutions representing concrete environments

Gao Xiaojian; Zhang Jian; Yang Yingzi

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Preparation of chloride ion selective electrode and its potential response to different chloride solutions representing concrete environments

Gao Xiaojian *,Zhang Jian,Yang Yingzi

Harbin Institute of Technology Department of Civil Engineering

*Correspondence author

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Funding: 教育部博士点基金,国家自然科学基金（No.20070213036,50878068）

Opened online:13 April 2010

Accepted by: none

Citation: Gao Xiaojian,Zhang Jian,Yang Yingzi.Preparation of chloride ion selective electrode and its potential response to different chloride solutions representing concrete environments[OL]. [13 April 2010] http://en.paper.edu.cn/en_releasepaper/content/41880

Ag/AgCl electrode was made from anodized Ag wire and the influence of anodization current density on stability of Ag/AgCl electrode was studied in this paper. Potential response of Ag/AgCl electrode was tested in synthetic concrete pore solutions with different concentrations of chloride ions and influences of sulfate, calcium, potassium and sodium ion on the potential response of Ag/AgCl electrode were also measured. The results show that Ag/AgCl electrode has the best potential stability when it is prepared with 0.4 mA/m2 of current density for 2 hours and there is no measurable potential difference among 20 electrodes prepared with such anodizing condition. The potential of Ag/AgCl electrode develops to a constant value in less than 60 seconds and maintains stable during the test period when immersed into synthetic concrete pore solution with different amount of chlorides. Ag/AgCl electrode shows a good linear potential response to a wide range of chloride concentrations from 0.005mol/L to1.0mol/L. Sulfate, calcium and sodium ions show inconsiderable influences on the potential of Ag/AgCl electrode. Therefore, it is suggested that Ag/AgCl electrodes can be used as chloride sensors in concrete exposed to different environments.

Keywords:Ag/AgCl electrode;potentiometry;chloride ion concentration;synthetic concrete pore solution.

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