聚氧乙烯型非离子表面活性剂的电喷雾质谱行为  

Electrospray Ionization Mass Spectrometric Behavior of Ethoxylates Surfactant

作　　者：刘壮峻[1] 陈卫东[1] 朱凤英[1] 王复[1] 

机构地区：[1]华东理工大学分析测试中心,上海200237

出　　处：《华东理工大学学报（自然科学版）》2005年第6期825-828,共4页Journal of East China University of Science and Technology

摘　　要：聚氧乙烯型表面活性剂是一类重要的非离子型表面活性剂,易与阳离子形成加合离子[M+X]+。应用电喷雾飞行时间质谱仪(ESI-TOF-M S),以直接进样的方式,对壬基酚聚氧乙烯醚加合离子进行了研究。通常在谱图中可见钠、钾加合离子[M+N a]+、[M+K]+。样品中的钠、钾离子的浓度影响对应加合离子的谱峰强度。样品中加入M gC l2,可在谱图上观察到[M+M gC l]+离子的谱峰。用高分辨电喷雾质谱确定[M+18]+峰对应于[M+NH4]+。Etyoxylates are an important group of nonionic surfactants. A method of direct infusion analysis by electrospray ionization（ESI） time-of-flight（TOF） mass spectrometry （MS） has been used to determine nonylphenol ethoxylates （NPEO） adducts. Common sodium and potassium adducts[M＋Na]^＋, [M＋K]^＋ were observed in spectrum. With the addition of MgCl2, NPEO form the adduct of [M＋ MgCl]^＋. Through comparison of spectra, addtion of various amount of K^＋ into NPEO samples could dis- play the change of peak intensity between [M＋Na]^＋ and [M＋K]^＋. ESI/MS high-resolution spectrum was used to confirm[M＋ 18] eorresponding to [M＋NH4]^＋.

关 键 词：壬基酚聚氧乙烯醚 电喷雾质谱 表面活性剂 加合离子 

分 类 号：O625.63[理学—有机化学]