Created on Thursday, 23 March 2017


A simple flow injection system using three 3-way solenoid valves as an electric control injection valve and with a simple home-made chloride ion selective electrode based on Ag/AgCl wire as a sensor for determination of water soluble chloride in admixtures and aggregates for cement has been developed. A liquid sample or an extract was injected into a water carrier stream which was then merged with 0.1 M KNO3 stream and flowed through a flow cell where the solution will be in contact with the sensor, producing a potential change recorded as a peak. A calibration graph in range of 10–100 mg L−1 was obtained with a detection limit of 2 mg L−1. Relative standard deviations for 7 replicates injecting of 20, 60 and 90 mg L−1 chloride solutions were 1.0, 1.2 and 0.6%, respectively. Sample throughput of 60 h−1 was achieved with the consumption of 1 mL each of electrolyte solution and water carrier. The developed method was validated by the British Standard methods

Link article


J. Junsomboon and J. Jakmunee “Determination of chloride in admixtures and aggregates for cement by a simple flow injection potentiometric system“, Talanta, 76 (2008) 365 – 368.

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