Chemical State Analysis of Sulfur in Coal by High Resolution Fluorescent x-Ray Spectrometry
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概要
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Chemical states, especially oxidation states, are knowm to have various effects on x-ray spectra from sulfur. The efiects, however, are not large and it is rather difficult to observe them with a conventional commercially available x-ray spectrometer. A high resolution two-crystal x-ray spectrometer recently constructed was used for the observation of these phenomena in order to utilize them for the chemical state analysis of sulfur in coal.<BR>Pressed samples were excited with x-rays from a Cr target tube. Resultant fluorescent x-rays (SK<SUB>α</SUB>) were analyzed with the two-crystal spectrometer (prototype of Toshiba AFV 701) equipped with Ge (111) or ADP (101) crystals. A gas flow proportional counter was used as a detector. Pulses from the detector were stored in a multichannel pulse height analyzer (multiscaler mode. In case of a low intensity, the spectrometer was scanned repeatedly and pulses were accumulated several times.<BR>The energy of SK<SUB>α</SUB> increases with the increase of oxidation number. The spectrum from Na<SUB>2</SUB>S<SUB>2</SUB>O<SUB>3</SUB>, which contains S<SUP>2-</SUP> and S<SUP>6+</SUP>, shows two components which correspond to S<SUB>2-</SUB> in FeS and S<SUP>6+</SUP> in Na<SUB>2</SUB>SO<SUB>4</SUB>. This fact means that qualitative and quantitative chemical state analyses can be performed by measuring SKα spectra precisely.<BR>SKα from coal has a strong peak and a weak shoulder which is on the short wavelength side of the intense main peak. These two components were concluded to be due to S<SUP>2-</SUP> and S<SUP>6+</SUP> by comparing their positions with the spectra of known compounds.<BR>Ouantitatne analyses of S<SUP>2-</SUP> and S<SUP>6+</SUP>. were performed with a non-linear least square method. The result for variaus coals were discussed (total S: 0.6-3. 3%, S<SUP>6+</SUP>: 5-28).
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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