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topic 4363

Is there a low cost Analysis for Cobalt in a Nickel bath?


Hey Everybody,

Wendt Dunnington makes Diamond and CBN tooling and we electroplate nickel (from Watts and Sulfamate baths) to hold the super abrasives in place. In a R&D mode we are adding Cobalt (1000 to 3000 ppm range)to the nickel chemistry. A low cost analysis for Cobalt in the presence of Nickel would be very helpful. Any ideas?


Fred Mueller, CEF
Wendt Dunnington - Royersford, Pennsylvania


Nickel and cobalt are so close to identical That a cheap method is probably not possible. Atomic Absorption and possibly ICAP/MS may be necessary.

James Watts
- Navarre, Florida


As long as the Ni/Co ratio is not more than a few hundreds, you should be able to do a colorimetric analysis based on formation of cobalt thiocyanate and its extraction into an organic phase. You will need a simple spectrophotometer (2K) and, preferably, a simple centrifuge (about 0.5K).

Another option I am aware of is potentiometric titration with potassium ferricyanide in the presence of ammonia. Worth trying if you have the equipment.

Emanuel I. Cooper
IBM - Yorktown Heights, New York

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