Determination of chloride in admixtures and aggregates for cement by a simple flow injection potentiometric system.
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 0.1M KNO(3) 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.
Junsomboon
Jaroon
J
Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.
Jakmunee
Jaroon
J
D002712:Chlorides / Q000032:analysis*; D003738:Dental Cements; D017022:Flow Injection Analysis; D017736:Ion-Selective Electrodes; D011199:Potentiometry / Q000379:methods* / Q000592:standards; D015203:Reproducibility of Results
D002712:Chlorides; D003738:Dental Cements