Analytical Method: Chromium in plating baths

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. 116754  Water GR
Sample preparation:
In the determination of chromic acid - content (content of chromium VI) the concentrated bath liquors must be appropriately diluted.
In a 500 ml standard volumetric flask place 3.0 ml of bath fluid, cooled to room temperature, fill up to volume with water GR and mix well. Pipet 2.0 ml from this solution into a 500 ml standard volumetric flask and fill up to volume with water GR.
Determine with the above mentioned test kits
Chromic acid content in g/l CrO3 = analysis value in mg/l Cr x 80


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