U.S. Geological Survey Certificate of Analysis
Coal, Lower Bakerstown, CLB-1
The medium volatile bituminous coal used in the preparation of this USGS reference material was collected in 1982 from the Lower Bakerstown coal bed under the direction of Paul C. Lyons. All values are reported on a whole coal basis.
Recommended Element Concentrations are derived using at least three independent methods of analysis from a minimum of two independent laboratories. Statistical treatment of the data uses the procedures outlined in previous USGS publications (Kane et al. 1990).
Information values are presented when less than three independent methods of analysis were used to determine the final concentration. Standard deviations are provided when at least three independent laboratories reported values in statistical agreement.
|Major Component||Wt %||±||Oxide||µg/g||±|
Wilson, S.A. 1997, Certificate of Analysis Coal, Lower Bakerstown CLB-1: U.S. Geological Survey Open-File Report 97-299, p. 1.
|Fe2O3T||Total iron concentration expressed as Fe2O3|
|Stot||Total sulfur concentration|
|Wt %||Percent of total element concentration|
|µg/g||Total element concentration exressed as micrograms of element per gram of solid sample|
|±||One standard deviation|
Unless indicated total element concentrations are reported for material on an as-received basis.
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U.S. Geological Survey
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