Determination of Cl- in Concrete Materials by Ion Chromatography

Hong Yan Guan; Jian Jun Ding; Zhong Bao Guo; Ming Yu Wang; Yi Fei Mei

doi:10.4028/www.scientific.net/KEM.680.52

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 680Determination of Cl- in Concrete Materials by Ion...

Determination of Cl^- in Concrete Materials by Ion Chromatography

Abstract:

The determination of chloride ions in concrete materials accurately is far and away crucial, since chloride ions can cause corrosion of steel and concrete cover off. The conventional potential method and silver nitrate titration method usually show features of simple operation and short duration, nevertheless, they are not suitable for accurate analysis for concrete attributing to their low accuracy and detection limit. In this paper, an ion chromatography method was presented to determine chlorine in concrete materials. Concrete samples were pre-processed and then extracted with distilled water. The extraction solutions were purified on a 0.22 μm filter membrane, an On Guard SPE-RP column and a SPE-H column sequentially for eliminating undissolved substance, organisms and metal ions before ion chromatographic analysis. The chromatographic separation was performed on a Dionex ICS-1000 Chromatographic using 25.0 mmol/L KOH solutions as mobile phase at 1.0 mL/min. Results show that the detection limit of the method was 0.004 mg/L. The linear relationship of the external Cl^- standard solutions was 0.9994, and the sample analytical RSD was 0.44%.

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Periodical:

Key Engineering Materials (Volume 680)

Pages:

52-55

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.680.52

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Online since:

February 2016

Authors:

Hong Yan Guan*, Jian Jun Ding, Zhong Bao Guo, Ming Yu Wang, Yi Fei Mei

Keywords:

Chloride Ions, Concrete Materials, Ion Chromatograph

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* - Corresponding Author

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