煤焦油 饱和分、芳香分、杂原子、酚类、胶质和沥青质含量的测定 溶剂萃取-柱层析分离重量法

Coal tar—Content determination of saturates, aromatics, heteroatomics, phenols, resins and asphaltene—Solvent extraction-column chromatography separation gravimetric method