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Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Accurate method of rhodium analysis
2007
Hi
My company is a manufacture of Electroplating chemistries and a Precious Metal Refiner. We are a member of the AESF and subscribe to
Metal Finishing.
With the ever-increasing price of Rhodium we are looking for a very accurate method of Rhodium Analysis...Years ago before AA and ICP we used a method developed by Dr. D.G. Foulke who was a research chemist for Sel-Rex, OMI, (now Enthone).
The process was to reduce the Rhodium from a sulphate solution using hydrazine sulphate or oxalic acid..can't remember which. and fire the percipate under hydrogen in a crucible and weigh the Rh as metal..Do you have any information on this analysis? or a method to do Rh by ICP or AA. We find all the instrumentation results to be high..Fire assy, even by the best umpires are not consistent..
Best Regards
Jerry Smith
- Seminole, Florida
Gerald,
Have you tried using matrix matched standards for AA? Many components of a treatment system can have an effect on the overall reading you obtain (either supression or enhancement) so if you are using a complex mixture (as many plating solutions are) then it is advisable to matrix match standards.
Aerospace - Yeovil, Somerset, UK
2007
2007
Jerry -
You should be able to analyze dissolved Rhodium by ICP depending on how low you feel the concentration might be.
As far as accuracy is concerned - if you run the method of standard additions that should help you with matrix matching problems.
Terry
- Auburn, Washington
Q. dear sir,
How to analyse rhodium in anode slime samples? In anode slime its range should be 1-5 ppm (I don't know but I guess).
Please tell me correct procedure to analyse Rh in slime samples.
- Tuticorin, Tamilnadu, India
August 30, 2012
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