Potentiometric Response of Ag/AgCl Chloride Sensors in Model Alkaline Medium

Table 2

Model solutions and criteria for sensors’ performance.

Test series	Used medium	pH	Chloride concentration (mM)	Purpose of OCP measurement in this environment (criteria for sensors’ performance)
1	Simulated pore solution (SPS)	13.6	0	Stability: OCP variation in chloride-free alkaline solution (Figure 2)
2	Cement extract solution (CE)	12.8	20, 260	Reproducibility: dependent on different properties of the AgCl layer (Figure 4)
3	Simulated pore solution (SPS)	7, 9, 12.8, 13.6	1, 2, 4, 16, 62, 250	Reliability: interference of hydroxide ions and chloride detection limits (Figure 6)
4	Cement extract solution (CE)	12.8	12, 14, 16, 20, 27, 44, 77, 142, 260, 513, 1008	Reversibility: response to continuous addition of chloride (Figures 7 and 8)
5	Simulated pore solution (SPS)	13.6	0, 125, 1000