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Quick Analysis of Chrome Bath

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Is there a procedure available for checking Cr +6, Cr + 3 in chrome bath using spectrophotometer? What is the wave length at which one can detect Chrome?

Kaushik Magiawala
plating shop employee - Gandhinagar, India

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You may want to get the book "Colorimetric Analysis of Metal Finishing & Metal Working Solutions & Effluents" by Aubrey Knowles that will describe various methods. If not, you can try a simple direct method with hex chrome at 370 nm and tri chrome at 640 nm. Dissolved iron will likely interfere with the hex chrome measurement, but it may be accurate enough for your purposes.

Jon Barrows, MSF, EHSSC
Chemical Process Engineer
Polyfab Plastics & Supply

Springfield, Missouri

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