Trace Elements in West Virginia Coals
Thallium (Tl) Summary Statistics
Thallium averaged 1.19 ppm (± 1.55 ppm) in West Virginia
coals on a whole coal basis with a histogram highly skewed toward the low
values showing an extended tail toward higher values with a maximum value
of 16.2 ppm in the Harlem coal (see cautionary
note page). Thallium correlated very poorly with ash yield (r
= +0.3308) and moderately only with mercury (Hg) (r = +0.7006) and total
sulfur (r = +0.6465), but not pyritic sulfur. Mercury occurs in solid
solution in pyrite which explains the correlations with mercury and total
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