Analytical Method: Chromium (total) in steels (Others)

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. 114552  Spectroquant® Chromium Cell Test
Cat.No. 114758  Spectroquant® Chromium Test
Cat.No. 100317  Hydrochloric acid 37 % for analysis
Cat.No. 100456  Nitric acid 65 % for analysis
Cat.No. 100514  Perchloric acid 70 % for analysis
Cat.No. 116754  Water for analysis
 
Sample preparation:
In a covered glass beaker dissolve about 100 mg of sample in 3 ml hydrochloric acid 37 % and 2 ml nitric acid 65 % on the steambath. Repeat the acidification, if necessary, until all the sampling material is in solution. After cautious addition of 2 ml perchloric acid 70 %, evaporate to 1 - 2 ml. Transfer the residue to a 1000-ml volumetric flask, fill up to volume with water for analysis and mix well.
 
Note: The described dilution 1:10000 is for the determination of chromium in unalloyed steel; refined steels require a further 1:50 dilution.
 
Analysis:
Determine with the above mentioned test kits.
 
Calculation:
Dilution 1:10.000
Dilution 1:500.000

 

Chromium (total) content in % =   analysis value in mg/l x 100
weight of sample in mg

Chromium (total) content in % =   analysis value in mg/l x 5000
weight of sample in mg

 

 

 

 

 

 

Materials

     
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