chro·ma·tog·ra·phy
noun/ˌkrəʊməˈtɒɡrəfi/
/ˌkrəʊməˈtɑːɡrəfi/
[uncountable] (chemistry)- the process of separating a mixture by passing it through a material through which some parts of the mixture travel further than others
层析，层谱法（利用混合物各部分在介质中的通透距离差异而将其分离的方法） Word Origin1930s: from German Chromatographie (from chromato-, from Greek khrōma, khrōmat- ‘colour’ and -graphy, from or suggested by Greek -graphia ‘writing’), early separations being displayed as a number of coloured bands or spots.