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Sample Weight: 1.5 g


The sample is digested by using a mixture of sulfuric, hydrofluoric and hydrochloric acids. The solution is titrated with a standardized solution of potassium dichromate to determine Fe2+ using a sodium diphenylanime sulphonate indicator.

The reporting limit range for FeO is 0.05% to 50%.

Analytical Performance

Data will be deemed acceptable if recovery of FeO is ±15% at five times the Lower Limit of Determination (LOD) and the calculated Relative Standard Deviation (RSD) of duplicate samples is no greater than 15%.

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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