薄层色谱-光谱联用鉴定金属清洗剂中非离子表面活性剂组分

Identification of Nonionic Surfactants in Cleaning Agent for Metal by Thin Layer Chromatography Spectroscopy

采用薄层色谱法分离了金属清洗剂。以氯仿∶甲醇(8.5∶1),加适量三乙胺体系为展开剂,碘蒸气显色,所得斑点清晰、无拖尾,结果表明金属清洗剂含6种组分。采用亚甲蓝-氯仿法鉴定表面活性剂的离子类型,该样品中两种组分为阳离子表面活性剂,4种组分为非离子表面活性剂。利用红外吸收光谱法、核磁共振波谱法确定了4种非离子表面活性剂的分子结构。

In the separation of cleaning agent for metal by thin layer chromatography,the solution containing chloroform,methanol（mixed in the ration of 8.5：1） and appropriate amount of triethylamine was used as developing solvent and iodine vapour as colour developing reagent,and the spots were separated clearly,sharply and without trailing.Six kinds of composition were showed in the sample.The ion types of surfactant actitives by methylene blue-chloroform method was investigated,and there are two types of cationic surfactants and four types of nonionic ones were in the sample.With infrared and nuclear and magnetic resonance spectroscopy methods,the molecular structure of the four kinds of nonionic surfactant were identified.