Analytical Suite Metadata

ActLabs 1C - Exp 2 - Fire Assay - Au, Pd, Pt - ICP/MS (Au upper dl unbounded)

General Methodology:

1C - Exp 2 - Fire Assay -Au,Pd, Pt- ICP/MS

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 with Ag added as a collector 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. The crucibles are then removed from the assay furnace and the molten slag (lighter material) is carefully poured from the crucible into a mould, leaving a lead button at the base of the mould. The lead button is then placed in a preheated cupel which absorbs the lead when cupelled at 950°C to recover the Ag (doré bead) + Au, Pt and 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 a Perkin Elmer Sciex ELAN 6000, 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.  Smaller sample splits are used for high chromite or sulphide samples to ensure proper fluxing and metal recoveries.

[description retrieved on 2016-03-09 from]

Instrument: unstated

Sample material: solid

Sample weight: unstated

Analytical Technique:

Hierarchical classification

Technique >> Spectroscopy >> Mass >> ICP-MS



Analytical Decomposition:

Hierarchical classification

Decomposition >> Fusion >> Fire Assay >> PbO/Ag



Analytical Methods:

IndexMethod OrderMethod IDQuantityDetection Limit
1  5860     Au_FA_MS  1
2  5564     Pt_FA_MS  0.5
3  5565     Pd_FA_MS  0.5

Associated Analytical Packages:

IndexPackage IDPackage Name
1  314     ActLabs GSC TGI4 whole rock analysis (variant #5)
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