Figure 3
From: Role of pyrite in formation of hydroxyl radicals in coal: possible implications for human health
H2O2 generation from coal samples of varying sulfur content (i.e., FeS2) in the presence of 1 mM EDTA. EDTA solutions were mixed with dry coal samples for about 2 min, filtered, leuco crystal violet (LCV) assay agents added, and absorbance at 590 nm recorded. LCV oxidation by H2O2 results in a colored product, which scales with H2O2 concentration. A 30 m2/L total surface area of each of the coal samples was achieved at mass concentrations ranging from 6 g/L to 26 g/L depending on the physical properties of each coal sample.