Role of pyrite in formation of hydroxyl radicals in coal: possible implications for human health

Table 1 Coal Samples

Sample #^a	Origin	Coal type	Surface area (m²/g)^b	Sulfur (mass fraction)^c	Pyritic sulfur (mass fraction)^c	Pyritic sulfur content per surface area (g/m²)	Iron release (μM)^d
1635	Erie, Colorado	subbituminous	1.79	0.3616	0.00	0	0.00
2682b	Gillette, Wyoming	subbituminous	4.94	0.4917	0.01	0.002	0.02
2692b	Holden, West Virginia	bituminous	1.35	1.17	0.49	0.363	0.48
2684b	Marion, Illinois	bituminous	2.11	3.076	0.52	0.246	8.31
2685b	Captina, West Virginia	bituminous	1.72	4.73	1.15	0.669	13.3

^a National Institute of Standards & Technology sample numbers
^b BET surface area values are for coal as received and as used in experiments, not dessicated.
^c dry basis
^d 0.125 m²/L coal loadings, total iron [i.e., Fe(II) & Fe(III)] after 7 hrs in 1.5 mg/L RNA solution

ISSN: 1743-8977