研究了用无溶剂重结晶法提纯2 ，6 二氯甲苯。
Purification of 2,6 dichlorotoluene by the recrystallization method without solvent was studied.
本文综述了磷脂酰肌醇的分离提纯的方法，主要有溶剂法、柱层析法、酶法等。
The paper summarizes the separating and purifying method of soybean lipositol, the main is solvent method, column chromatography, enzyme etc.
本文论述了利用混合溶剂—— 结晶法提纯除虫脲的分析技术。
The method was established for purification of diflubenzuron by crystal technique with mixed solvents.
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