Abstract
Complying with the government's general policy of energy, Japanese electric power industries have been promoting plans to diversify energy sources. Accordingly, their consumption of coal, which was 7 million tons in 1975, was doubled in 1982. It is expected to go to increasing gradually hereafter.In spite of this current trend as referred above, the analyses of sulfur and nitrogen, which are necessary for quality control of various kinds of coal, are still being carried out based on the JIS (Japanese Industrial Standard) method for analyzing coal established in 1959. This method is inferior to the JIS Instrumental method for analyzing oil (modified in the late 1970's) in the analytical time and easiness of procedure. Therefore, the improvement of its inferiority is highly desirable.This paper describes the application of instrumental methods, which have been making a remarkable advance in recent years, to analyses of sulfur and nitrogen in coal, and reports the comparative evaluation of them with the conventional JIS method in terms of accuracy, precision and analytical time etc.As a result, the infrared sulfur analyzer (manufactured by LECO, U.S.A.) provided analytical values, which were obtained within three minutes, statistically equal to those by the Eschka Method (the JIS method). Permissible tolerance for repeatable measurements (n=2) was 0.01% for the sample contained below 0.5% of sulfur. In another instrumental method for analyzing nitrogen, combining a gas generator (manufactured by Sumitomo Co., Ltd.) with a gas chromatograph, the analytical values, which were obtained within five minutes, were statistically equal to those by the semi-micro Kjeldahl method (the JIS method). Permissible tolerance for repeatable measurements (n=2) was 0.04%. As noted above the short analytical time and easiness of procedure in the instrumental methods were verified. We also applied this instrumental method to oil for comparative study, and obtained analytical values almost equal to those obtained by the JIS instrumental method for analyzing oil.
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