reducing rh sulphate solution to rh using formic acid

Is it possible to recuperate rh from a rh sulphate solution, using formic acid?any special measure have to be taken? Up to now ,i recuperate rh by cementation with,zinc or iron powder----i think that reducing with an acid like formic, or hidrazine is quicker and cleaner -------please ,i need this information----thanks and regards to all ------Arthur kierski

I found this Arthur, https://books.google.com/books?id=rLiSDgAAQBAJ&pg=PA207&lpg=PA207&dq=reducing+rhodium+sulfate+with+hydrazine&source=bl&ots=caGYwPqwA4&sig=susBL63q4TcqbpakMCvhoRoQQgw&hl=en&sa=X&ved=2ahUKEwim4oHx77PeAhXpIjQIHY1mBnk4ChDoATAAegQIAxAB#v=onepage&q=reducing%20rhodium%20sulfate%20with%20hydrazine&f=false

Notice how dilute this is done. 2ml diluted to 100ml and then brought to a neutral ph.
It is a method to determine rh concentration of a plating solution, so not really very practical for treating bulk solutions.
I am quite sure it would work less dilute perhaps not reducing all the rh, but you could zinc out the rest.
Lou?

thanks Platdigger for the link---i need an easier method,because i have many litres of rhsulphate solution---

We know that palladium reduction with formic acid (acidic ammonium formate actually) necessitates heating, although it is thermodynamically favorable. Rhodium reduction with formic acid is a bit less favorable then Pd's so it might work with heating - worth trying

Thanks Lino,monday ,i will give a try ,and tell you the results -----i hope that will work------