産地가 다른 22種類의 國産無煙炭에 含有되어 있는 黑鉛의 含量을 internal standard method와 direct method로 定量分析하였다. 두 方法으로 實驗한 分析結果는 約 $pm$ 3%內에서 잘 一致하였다. 各 試料中에 含有되어 있는 無定形炭素와 黑鉛性炭素의 含量比는 地域別로 多小 差異가 있으며 聞慶地區가 14${sim}$24%,大川地區가 12${sim}$14%, 江原地區가 3${sim}$5%로서 江原地區에서 産出되는 無煙炭中의 黑鉛含量이 가장 적음을 알 수 있다.
Twenty two Korean anthracites obtained places were quantitatively analyzed by the internal standard method and direct method. The range of deviation the results obtained by the two methods is about ${pm}$3%. The ratio of graphite to amorphous carbon contents of each samples is very different according to the district of coal mine. The ratio of graphite contents in Mun Kyung district is from 14 to 24 %, Dae Chun district is from 12 to 14 % and Kang Won district is from 3 to 5 %. We have known athat the anthracites of Kang Won district are the least graphite contents.
