plating, anodizing, & finishing Q&As since 1989
Accurate method of rhodium analysis
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 sulfate solution using hydrazine sulfate 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..
- Seminole, Florida
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
"Practical Inductively Coupled Plasma Spectroscopy"
from Abe Books
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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.
- Auburn, Washington
August 30, 2012
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
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