Summary
The analytical work performed on coal samples received in the U.S. Geological Survey laboratories is outlined in figure 1. An undried 600 g (about 1 qt) split of samples representative of the set collected is sent to the U.S. Bureau of Mines at Pittsburgh, Pa., for the routine coal analysis. This analysis sequence includes (1) proximate analysis (percent ash, moisture, fixed carbon, and volatile matter), (2) ultimate analysis (percent carbon, hydrogen, oxygen, nitrogen, and sulfur), (3) Btu determination, and (4) sulfur analysis (percent organic sulfur, pyrite sulfur, and sulfate sulfur). The analytical methods used by the Bureau of Mines have been described in U.S. Bureau of Mines Bulletin 638 (Staff Office of the Director of Coal Research 1967) and will not be described in this report. The remainder of all analytical work and sample preparation shown in the analysis sequence flow diagram (fig. 1) is performed by the U.S. Geological Survey laboratories.
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