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topic 733

Method to analyze purity of coumarin


I would like to know if there is any ASTM standard to check purity of coumarin or if there's any way to test it at all. Thanks in advance.

Guillermo Luna
- Mexico City, Mexico


Coumarin - what do you use it for? Once upon a time it was used as a nickel brightener but it is history. I think it is not allowed to use it any more. Anyhow, any plating shop that uses coumarin has a terrible smell all over the facility. Later on it was used for semi-bright nickel but nowadays even for this application it is not used anymore. So, what do you use it for?

sara michaeli
sara michaeli signature 
Sara Michaeli
chemical process supplier
Tel-Aviv, Israel

Hi, Sara.

Your attitude about coumarin is probably correct, but it isn't history quite yet. I was at a large O.E.M. chrome plater in Canada recently and, sure enough, they were using generic coumarin in their semi-bright nickel -- a lot of it!

Unfortunately, I don't know anything about controlling it except by hull cell analysis.

Ted Mooney, Teds signature
Ted Mooney, P.E. RET
Pine Beach, New Jersey


Why can't you take its melting point to determine purity? Coumarin should have a mp of 71 degrees C. Usually has a vanilla-like aroma.

Rebecca Zahn



December 17, 2008

Hi, Robert. Yes, it's being used, but what is the analytic method that you are referring to?


Ted Mooney,
Teds signature
Ted Mooney, P.E. RET
Pine Beach, New Jersey

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