Trace Elements in West Virginia Coals

Elemental Distribution (Histogram) Example

The statistical distribution (histogram) of each trace element is included to convey the actual distribution of trace element values in West Virginia coals.  These charts show the trends of the trace element in ppm on a whole coal basis for all coal samples.  The average trace element value in ppm is given as well as the number of samples determined. Some trace elements display a somewhat normal distribution, while other element distributions are highly skewed. Arsenic, for example, averages 17.13 ppm in 848 samples, but is less than 5 ppm in 363 samples, and less than 10 ppm in 510 samples with a small number of samples containing very high (>100 ppm) arsenic concentrations.