. Author manuscript; available in PMC: 2010 Oct 27.

Published in final edited form as: Am J Respir Cell Mol Biol. 2002 Nov;27(5):568–574. doi: 10.1165/rcmb.4821

TABLE 1.

Characteristics of two bituminous coals from the Pennsylvania and Utah coal mine regions

Coal	CWP (%)^*	Carbon (%)^†	Atomic C/H (Molar Ratio)^†	Quartz (%)^†	Bioavailable Iron (ppm)^‡
Coal	CWP (%)^*	Carbon (%)^†	Atomic C/H (Molar Ratio)^†	Quartz (%)^†	Fe²⁺	Fe³⁺
PSOC-1198 (PA)	26	72.44	1.39	3.50	15,010	8,588.0
PSOC-459 (UT)	4	71.32	1.16	3.63	0	4.6

Definition of abbreviations: carbon to hydrogen ratio, C/H; coal workers’ pneumoconiosis, CWP; Pennsylvania, PA; Utah, UT.

Prevalence of CWP was obtained from Morgan and coworkers (4).

^†

Data on carbon content or molar ratio of carbon/hydrogen as indicators of coal rank and quartz content in the coals are provided by the Penn State Coal Sample Bank and Database.

^‡

Levels of bioavailable iron (both Fe²⁺ and Fe³⁺) were determined spectrophotometrically by 2,2-dipyrydil-Fe²⁺ and deferoxamine-Fe³⁺ complexes at 520 nm and 430 nm, respectively. Bioavailable iron is defined as iron released in 10 mM phosphate solution, pH 4.5, which mimics the phagolysosomes of cells (7).