The Chemical Analysis of Argonne Premium Coal Samples
Edited by Curtis A. Palmer
1997
U.S. Geological Survey Bulletin 2144
Determination of Selected Elements in Coal Ash from Eight Argonne Premium Coal Samples by Atomic Absorption Spectrometry and Atomic Emission Spectrometry
By Michael W. Doughten
Table 1. Coal ash yields for Argonne Premium Coal samples.
[Coal ash yields determined by Larry Winters, U.S. Geological Survey]
| Coal sample | Percent ash |
| UF PC-1-1 | 13.5 |
| WY PC-2-1 | 8.5 |
| IL PC-3-1 | 16.2 |
| PITT PC-4-1 | 9.2 |
| POC PC-5-1 | 5.3 |
| UT PC-6-1 | 4.6 |
| WV PC-7-1 | 19.4 |
| ND PC-8-1 | 9.5 |
Table 2. GFAAS (graphite furnace atomic absorption spectrometry) operating conditions.
| Cd | Pb | |
| Wavelength | 228.8 nm | 283.3 nm |
| Bandpass | 0.7 nm | 0.7 nm |
| Source lamp | Hollow cathode | Hollow cathode |
| Graphite tube | Uncoated | Uncoated |
| Sample size | 20 mL | 10 mL |
| Matrix modifier, 2 percent solution of NH4 H2 PO4 |
10 mL | 10 mL |
| Drying temperature | 110°C | 110°C |
| Drying time: | ||
| Ramp | 10 sec | 0 sec |
| Hold | 30 sec | 30 sec |
| Charring temperature | 250°C | 950°C |
| Charring time: | ||
| Ramp | 5 sec | 0 sec |
| Hold | 25 sec | 20 sec |
| Atomizing temperature | 2,300°C | 2,700°C |
| Atomizing time: | ||
| Ramp | 0 sec | 0 sec |
| Hold | 5 sec | 5 sec |
| Background correction | Zeeman | Deuterium |
| Calibration standard con- | ||
| centration range | 0-4 ng/mL | 0-0.2 g/mL |
| Lower limit | 0.2 ng/mL | 0 .01 g/mL |
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