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8 - Au Pd Pt - Fire Assay - ICP

A 30 gram sample is mixed with fire assay fluxes (borax, soda ash, silica, litharge) and with Ag added as a collector and the mixture is placed in a fire clay crucible, the mixture is preheated at 850 °C, intermediate 950 °C and finish 1060 °C, the entire fusion process should last 60 minutes.  After cooling, the lead button is separated from the slag and cupelled at 950 °C to recover the Ag (doré bead) + Au, Pt, Pd.

The Ag doré bead is digested in hot (95 °C) HNO3 + HCl.  After cooling for 2 hours the sample solution is analyzed for Au, Pt, Pd by ICP/OES using a Varian 735 ICP.  A blank and a digested standard are run every 15 samples. Instrument is recalibrated every 45 samples. All samples are analyzed in duplicate. 

     

Code 8 AuPdPt  Elements and Detection Limits g/mt

Element

Detection

Limit

Upper

Limit

Au

0.001

1,000 

Pt

0.001

1,000 

Pd

0.001

1,000 

 

References :

Hoffman, Eric L. and Dunn, Bernie, 2002.  Sample Preparation and Bulk Analytical Methods for PGE.CIM Special Volume 54. The Geology, Geochemistry and Mineral Beneficiation of Platinum Group Elements Edited by Louis J. Cabri, pp.1-11.

 

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.



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