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Sample Size: 100 mL


Samples are concentrated by evaporation, followed by a short, hot digestion in aqua regia to dissolve remaining metal salts. The final solution is analyzed by Inductively Coupled Plasma - Mass Spectrometry (ICP-MS).

Method 38 Elements and Reporting Limits
Element Concentration (low) Concentration (high)
Au, Gold

0.01 ppb 100 ppm
Ir, Iridium

0.1 ppb 100 ppm
Pd, Palladium

0.01 ppb 100 ppm
Pt, Platinum

0.05 ppb 100 ppm
Re, Rhenium

0.1 ppb 100 ppm
Rh, Rhodium

0.1 ppb 100 ppm
Ru, Ruthenium

1 ppb 100 ppm

Analytical Performance

Data will be deemed acceptable if recovery of each element is ±20% at five times the Lower Limit of Determination (LOD) and the calculated Relative Standard Deviation (RSD) of duplicate samples is no greater than 20%.

Project Contact

Jaime Azain
Phone: 303-236-9376
Central Mineral and Environmental Resources Science Center

Mineral Resources Program Science Priority

The use of firm, trade, and brand names is for identification purposes only and does not constitute endorsement by the U.S. government.

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