Abstract
The authors have studied on the direct determination of phosphorus in coal and coke in the first and second reports, and found that some differences were observed between the analytical results obtained by the direct methods and that of the indirect method. It suggest that some losses of the phosphorus contents in coals may by caused during the incineration, asmentioned previously by A. K. Moitra et al. We attempted, therefore, to trace the behavior of the phosphorus in coal during the incinefation, and obtained the following informations;
1) About five to eleven percent of the phosphorus in original coals are lost during the incineration of the samples.
2) The indirect method is not so accurate that the direct methods such as wet oxidation method are recommended for a close examination of total phosphorus in coals.
3) The calculated value or oxygen in coal should be corrected by deducting the loss of phosphorus during incineration, though the maximum absolute value of the correction is estimated as about 0.01%.
