Abstract
The methods for the determination of carbon dioxide in coals are not specified in JIS M8813-1963, in disregard of the necessity for the correction of carbon present as carbonate in the ultimate analysis, etc.The authors have studied on this methods and obtained the following conclusions.1) The following modifications on the pressometric method proposed by ISO/TC 27 are effective in the improvement of repeatability of the method.ISO/TC 27-490 E Modificated method.Heating device of the reaction flask naked gas flame water bath (90°C)Heating time of it 3 min. 5 min.Cooling time of it 7 min. 9 min.2) The significant difference is not observed between two means of the pressometric method (modified ISO/TC 27 490E) and the gravimetric method (ASTM D 1756). Therepeatability of the pressometric method is superior to that of the gravimetric method, and the apparatus and procedures of the former are simpler than that of the latter.The pressometric method, therefore, is suitable when the method for the determination of carbon dioxide will be specified in JIS M 8813.3) The corrections for converting total carbon and oxygen values to organic ones calculated from the determined carbon dioxides of 25 samples are as follows:for carbon…0. 01-0. 54% (ab.)for oxygen …0. 03-1. 45% (ab.)
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