Ensuring the actual purity of the products is helpful for the development of production and market. Attempted to explain the p - phenylene diamine antioxidant produced double peak, protrusion peak, tailing peaks and other unusual phenomena in the chromatographic analysis as that in three - dimensional molecular structure of amines the transformation between corresponding isomers caused the molecular polarity changing.%从胺类分子的立体结构中对映异构体之间的相互转化，使分子极性发生改变，来解释对苯二胺类防老剂在色谱分析时产生双头峰、前伸峰、拖尾峰等异常色谱峰的现象，以便于保证对该类产品纯度的正确分析，以协助生产和市场的正确发展。
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