在狄戈辛纯度检查中我们感到用分配层析法要展开两次,费时,有时虽按规定操作~([1]),若不掌握其规律,结果往往失败,形成拖尾分不开现象。近年来在做狄戈辛对照品纯度检查的薄层鉴定时,摸索到一些规律,现简介如下。一、薄层板的制备和检查:取硅藻土~([2])2g、石膏0.3g置研钵中研匀, In the examination of Dioxin’s purity, we feel that the method of distribution chromatography should be used twice, time-consuming and sometimes operated according to regulations ~ ([1]). If we fail to grasp the law, the results often fail and the formation of tailings can not be separated. In recent years to do Dioxin Xin reference purity test thin layer identification, to explore some of the rules, are as follows. First, the preparation and inspection of the plate: Take diatomaceous earth ~ ([2]) 2g, gypsum 0.3g home research bowl uniform,