3. Classification of chromatography 一-一 (1) internal chromatography planar: paper, thin-layer (11) external chromatography column: packing, capillary column 层析室 层析纸 组 份点 展开剂 ∈展开荆 层折板 纸层析装置 薄层层析装置3. Classification of chromatography (ⅰ) internal chromatography : planar: paper, thin-layer (ⅱ) external chromatography : column: packing, capillary column