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1C - Rhodium

A sample size of 5 to 50 grams can be used but the routine size is 30 g for rock pulps, soils or sediments (exploration samples). The sample is mixed with fire assay fluxes (borax, soda ash, silica, litharge) and the mixture is placed in a fire clay crucible. The mixture is then preheated at 850°C, intermediate 950°C and finish 1060°C with the entire fusion process lasting 60 minutes. Instead of using Ag as a collector, Au is used to avoid the problem of insoluble Rh Ag alloys.

After cooling the lead button is separated from the slag and cupelled at 950°C to recover the bead.  The bead is digested in hot (95°C) HNO3 + HCl.  After cooling for 2 hours the sample solution is dissolved in acid and analyzed for Rh by using a Perkin Elmer Sciex ELAN 6100 or 9000 ICP/MS.   On each tray of 42 samples there are two method blanks, three sample duplicates, and 2 certified reference materials.

For vegetation ash samples a lower weight can be used but will result in elevated detection limits .


Code 1C-Rhodium Detection Limits (ppb)











Reference :

Hoffman, Eric L., Clark, John R. and Yeager, James R., 1998.  Gold Analysis – Fire Assaying and Alternative Methods. Explor. Mining Geology, Volume 7, Nos. 1 and 2, pp. 155-160.  

Activation Laboratories Ltd. | 41 Bittern Street, Ancaster, Ontario, L9G 4V5, Canada | TF: +1.888.228.5227
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