粉萆薢、绵萆薢、土茯苓为常用中药材,近年来由于药源紧张,进货渠道复杂,加之三者外观相似,故常混淆使用。目前在三者鉴别上虽有一些方法,但均存在操作繁琐、检验周期长等缺点。本文应用二阶导数光谱法对粉萆薢、绵萆薢、土茯苓进行鉴别。结果表明,此法快速、简便、重现性好,且不需对照品,可供检验时参考。 Whitefly, cotton aphid, and earthworm are commonly used Chinese herbal medicines. In recent years, due to strained sources of drugs and complicated purchase channels, the appearance of the three are similar, so they are often confused. At present, although there are some methods for the identification of the three parties, there are shortcomings such as cumbersome operations and long inspection cycles. This paper uses the second derivative spectroscopy method to identify the whitefly, cotton millet and earthworm. The results show that this method is fast, simple, and reproducible, and does not require reference materials. It can be used as a reference for inspection.