THIN-LAYER CHROMATOGRAPHY FOR DEMONSTRATING CHLORIDE ION AND ITS CATIONS IN CONCRETE SAMPLES

Abstract

The mobility, the ability for reactions and boundability of chloride ions depend on the type of cations that is present in the concrete. This is why it is important to detect the cations and their mobility.. In our experiments we have tried to detect chloride ions bounded to different (Ca++, Mg++, Na+, and K+) ions by thin-layer chromatography. As thin layer we used silica gel, aluminium oxide, MN cellulose. As eluent we used acetone-butanol-ccNH₄OH-water( 65:20:10:5 v /v) composition. We made visible the chlorides by the solution of AgN0₃ and different indicators, like bromocresol purple, fluorescein, alcoholic solution of dichlorofluorescein (DCF) and the mixture of bromocresol green and methyl red. To detect the Ca++, Mg++, Na+, and K+ ions we used different reagents. Significant colour-reactions were produced by cations in a larger quantity than 5 μg. The process seems to be good to detect qualitatively the chlorides and the chloride ions bounded to cations.