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.