Analytical Method: Chloride in concrete

Photometric determination using the iron(III)/mercury thiocyanate method after extraction

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. 100456  Nitric acid 65 % for analsis
Cat.No. 116754  Water for analysis
Membrane filter with 0.45 μm pore diameter
Nitric acid 18 %:
Under stirring slowly bring in 45 ml nitric acid 65 % into 150 ml water for analysis.
Sample preparation:
Mix about 1000 mg sample of concrete, shredded to a grain-size < 100 mm, with 20 ml nitric acid 18 % for
10 minutes and then heat to moderate boiling for 5 minutes. Boiling of the mixture is particulary important with sulphide-containing material. Filter the cooled solution through a membrane filter.
Determine with the above mentioned test kits.

Chloride content in %  =   analysis value in mg/l Cl x 2
weight of sample in mg





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