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介绍了气相渗透法测定非离子型表面活性剂数均分子量的原理、条件和方法。用标样和混合标样进行了对照测试，相对误差小于2％，变异系数小于1％。
The principle, conditions and methods for determining the number average molecular weight of nonionic surfactants by gas phase infiltration method are introduced. Control samples were tested with standard and mixed standards with a relative error of less than 2% and a coefficient of variation of less than 1%.