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Sample Weight: 2.5 g

Summary

Essential water is determined by drying the sample for 1 hour at 105±5°C to remove H2O¬ (hydroscopic water). Then the sample is heated at 950°C by using a tube furnace. The H2O+ expelled from the sample is absorbed by magnesium perchlorate. The gain in weight of the perchlorate is used to calculate the amount of combined water in the sample.

Non-essential water is determined by drying the sample for 2 hours at 105±5°C. From the loss in weight, non-essential water, in percent, is calculated.

The lower reporting limit is 0.1% for both forms of water.

Analytical Performance

Data will be deemed acceptable if recovery of Essential and Non-essential water 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
Email: jsazain@usgs.gov
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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