EI, i-C4H10-CI, NH3-CI, NH3-DCI and FDMS arc used to investigate the spectra of poly (oxyethlene) alkyl cther nonionic surfactants and the distribution of molecular weight is also determined.

• 对脂肪醇聚氧乙烯醚非离子型表面活性剂的EI，i－C4H10－CI，NH3－CI，NH3－ DCI和 FDMS的质谱断裂严物进行归纳，并与 GC，TLC法对比讨论了其分子量 分布的测定方法和存在的问题。