[Indirect determination of pyritic sulfur in coal by flame atomic absorption spectrometry].
An atomic absorption spectrophotometric method for the determination of pyritic sulfur in coal was developed based on oxidizing pyritic sulfur in coal into sulfate, which then reacted on an excess of solid barium chromate,and was followed by collection of the unreacted barium chromate and barium sulfate precipitates, and AAS determination of free chromate (equivalent to the sulfur originally present) at 357.9nm. The method was applied satisfactorily to the determination of pyritic sulfur in coal samples. The recovery of sulfur was 95 -102% and relative standard deviation 3-5%.
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Department of Applied Chemistry, Jiangsu Institute of Petrochemical Technology, 213016 Changzhou.