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METHODS FOR SAMPLING AND INORGANIC ANALYSIS OF COAL
U.S. Geological Survey Bulletin 1823

Edited by D.W. Golightly and F.O. Simon

Table 18. Compositions of coal ashes determined by methods based on atomic absorption spectrometry (AAS) or spectrophotometry (Sa) and on X-ray fluorescence (XRF) spectrometryb

  Concentration (percentc)
Sample SiO2 Al2O3 Fe2O3d MgO CaO Na2O K2O TiO2 P2O5 MnO
  AAS,S XRF AAS,S XRF AAS,S XRF AAS,S XRF AAS,S XRF AAS,S XRF AAS,S XRF AAS,S XRF AAS,S XRF AAS,S XRF
NBS 1633A 48.6 48.8 27.1 27.0 13.5 13.4 0.78 0.75 1.6 1.6 0.19 0.23 2.2 2.3 1.4 1.3 0.42 ND 0.05 0.02
Ash 1 6.2 9.9 4.0 4.1 67.4 60.3 0.28 ND 9.0 9.4 0.26 ND 0.30 0.26 0.18 0.13 0.02 0.05 0.08 0.09
Ash 2 37.5 38.1 24.2 25.2 12.3 11.9 0.52 ND 9.5 9.5 0.75 ND 1.2 1.2 1.0 0.97 0.21 0.18 0.06 0.06
Ash 3 53.4 54.5 22.3 23.8 13.4 15.3 1.0 ND 0.44 0.40 0.49 ND 2.9 2.8 1.0 1.2 0.16 0.09 0.03 0.03
Ash 4 26.2 26.3 12.0 10.9 47.6 45.5 0.59 ND 3.4 3.6 0.38 ND 1.2 1.2 0.59 0.64 0.15 0.12 0.06 0.07
Ash 5 56.9 57.6 24.5 25.3 7.3 7.5 1.2 ND 0.67 0.57 0.43 ND 3.3 3.3 1.2 1.3 0.39 0.30 0.02 0.02
Ash 6 51.5 47.6 30.3 30.4 6.2 6.1 0.96 ND 0.40 0.40 0.25 ND 4.1 4.0 1.2 1.1 0.12 0.15 0.01 0.05
Ash 7 15.1 18.9 22.0 21.2 26.6 28.2 1.2 ND 9.3 10.2 0.43 ND 0.10 0.13 0.88 0.87 2.4 2.8 0.02 0.03
Ash 8 48.6 47.5 26.9 29.8 15.8 16.9 0.40 ND 1.8 1.7 0.15 ND 0.57 0.62 0.94 0.94 0.17 0.12 0.01 0.03
Ash 9 45.4 48.5 15.4 18.7 4.7 4.4 2.2 ND 16.6 17.3 0.12 ND 1.1 1.1 1.4 1.3 0.15 0.25 0.10 0.11
a Only Al2O3, P2O5, SiO2, and TiO2 were determined by spectrophotometric methods.
b Analyst: George Sellers.
c ND: not determined.
d Total Fe is reported as Fe2O3.
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