The Chemical Analysis of Argonne Premium Coal Samples
Edited by Curtis A. Palmer
1997
U.S. Geological Survey Bulletin 2144
Compilation of Multitechnique Determinations of 51 Elements in 8 Argonne Premium Coal Samples
By Curtis A. Palmer and Sarah A. Klizas
Table 5. Recommended or average values for major elements in percentages, determined only by high-precision (HP) techniques using the criteria described in the text.
[Parentheses indicate that the value is only an average of concentrations determined by the HP techniques and is not a recommended value. Complete data set is given in appendix 1. Statistical analysis of all values, including errors and criteria for not recommending values, is given in appendix 2. "Excluded values" column indicates that the specified HP techniques were not used in determining the given value. The bracketed numbers with the letters indicate the samples for which the techniques were excluded and the reason the values were rejected. The following abbreviations were used under "Excluded values": 1 = UF PC-1; 2 = WY PC-2; 3 = IL PC-3; 4 = PITT PC-4; 5 = POC PC-5; 6 = UT PC-6; 7 = WV PC-7; 8 = ND PC-8; o = determined value was an outlier; s = only one significant figure in all determined values; f = values rejected because of forty percent rule (see text); and n = no values were determined or all reported values were upper limits. All techniques referred to under "Excluded values" were determined on the ash]
| UF PC-1 | WY PC-2 | IL PC-3 | PITT PC-4 | POC PC-5 | UT PC-6 | WV PC-7 | ND PC-8 | No. HP techniques |
Excluded values |
|
| Si | 2.63 | (1.1) | 3.05 | 1.86 | 0.76 | 0.91 | 5.0 | (0.67) | 2 | WDXRF [8o] |
| Al | 1.58 | .68 | 1.24 | .99 | .552 | (.37) | 3.16 | .400 | 3 | WDXRF [8o] |
| Fe | (1.8) | (.35) | (2.6) | (1.33) | .51 | (.30) | .39 | (.49) | 4 | |
| Mg | .080 | (.23) | .075 | .036 | .058 | (.033) | .090 | (.38) | 3 | WDXRF [3s,4s,7s] |
| Ca | (.42) | (1.12) | .93 | (.197) | .452 | .41 | .058 | 1.49 | 3 | WDXRF [7s] |
| Na | .033 | (.11) | (.10) | .033 | .079 | (.135) | .0348 | (.50) | 4 | WDXRF [1s,4s,7s] |
| K | .28 | (.030) | (.20) | .111 | (.031) | (.025) | .49 | (.034) | 4 | WDXRF [2s,5s,6s,8s] |
| ICAP-AES [6f,8f] | ||||||||||
| Ti | .078 | .053 | .070 | .055 | .039 | .023 | (.25) | .0192 | 3 | WDXRF [3s,6s,8s] |
| P | (.007) | .024 | (.0059) | (.010) | .00222 | (.00095) | (.0083) | .012 | 3 | WDXRF [1-3s,5-8s] ICAP-AES* [3s,6s,7s] |
| Mn | .0043 | .0020 | .0081 | .0019 | .0017 | .000416 | .00147 | .0081 | 3 | WDXRF [1-8n] |
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