Utilization of Precipitation-Potentiometric Method for the Measurement of Chloride Ion Content in Concrete
Abstract: Precipitation-Potentiometric Method was used for the measurement of chloride ion content in concrete. Effect of solution alkalinity on the testing results was investigated, meanwhile, which was also compared with the results obtained by ion chromatography (IC). The research indicates that the results obtained by Precipitation-Potentiometric Method have great difference with the IC results when the solution was not neutralized by dilute sulphuric acid, and the maximum deviation is closed to 30%. After neutralizing, however, the titration results are very near to the IC results and the maximum deviation is merely 5.3%. All of these show that the Precipitation-Poten- tiometric Method has the features of high reliability, low cost and easy operation, which can be used as the standard method for measuring the chloride ion content in cement-based materials.
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