Abstract
In connection with the determination of sulfate S, the sulfur mass balance for four bituminous coals was determined using different extraction procedures, including use of 1 m and 4.8 m HCl under nitrogen and under air, and at room temperature, 95°C and boiling point. Since HCl extractions yielded poor S mass balances (as low as 83%), acid extraction with formic acid was also evaluated. Extractions with formic acid gave better S mass balances than those obtained using HCl, and the sulfate S yields agreed with those measured by the ASTM D-2492 HCl procedure. 34S 32S ratios determined by stable sulfur isotope mass spectrometry demonstrated that formic acid extraction was more selective for sulfate sulfur than the more rigorous HCl extractions.
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