Analytical Method: Chloride in Building Materials

Instruments and Reagents:

Cat.No. 173016 Spectroquant^® VIS Spectrophotometer Prove 100 or
Cat.No. 173017 Spectroquant^® UV/VIS Spectrophotometer Prove 300 or
Cat.No. 173018 Spectroquant^® UV/VIS Spectrophotometer Prove 600 or
Cat.No. 109748 Spectroquant^® Photometer NOVA 30 or
Cat.No. 109751 Spectroquant^® Photometer NOVA 60 or
Cat.No. 173632 Spectroquant^® Colorimeter Move 100
Cat.No. 114946 Rectangular cells 10 mm and/or
Cat.No. 114947 Rectangular cells 20 mm and/or
Cat.No. 114944 Rectangular cells 50 mm
Cat.No. 114730 Spectroquant^® Chloride Cell Test
Cat.No. 114897 Spectroquant^® Chloride Test
Cat.No. 106498 Sodium hydroxide for analysis
Cat.No. 100456 Nitric acid 65 % for analysis
Cat.No. 109535 MColorpHastTM Universal Indicator strips pH 0 - 14
Cat.No. 116754 Water for analysis

Differential analysis of chloride soluble in hot water and total chloride can be carried out with suitable sample preparation.

Sample Preparation - Hot Water Extraction:

Prepare a fine powder of the sample and dry at 105 °C. Mix 5 g with water for analysis and boil for 30 minutes on a hot plate. Allow to cool, transfer the suspension to a 200-ml volumetric flask and make up to the mark with water for analysis. Mix well, filter through a paper filter and then use as sample for the determination of water - soluble chloride.

Sample Preparation - Total Content:

Mix 100 mg of the finely powdered material along and 10 pellets of sodium hydroxide, place in a nickel crucible and heat for 30 minutes at 550 °C in a muffle furnace. Allow to cool and carefully add 10 ml water for analysis. If necessary, heat gently to obtain a suspension. Adjust to approx. pH 5 with nitric acid. Using water for analysis, transfer the suspension to a 100-ml volumetric flask, make up to the mark with water for analysis and mix well. Filter through a paper filter before carrying out the analysis.

Analysis:

Determine with the above mentioned test kits.

Calculation:

Chloride content (water - soluble) in % = analysis value in mg/l Cl x 0.004
Chloride total content in % = analysis value in mg/l Cl x 0.1