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利用大气压离子化质谱技术 ,采用直接进样方式研究了N 聚氧乙烯醚衍生物的氧乙烯链聚合度 (EO数 )分布 ,并对O 聚氧乙烯醚衍生物及壬基酚聚氧乙烯醚进行了测定。当化合物的分子质量小于 1 0 0 0u时 ,采用大气压化学离子源和大气压电喷雾离子源两种离子化质谱技术均可得到正态的EO数分布曲线 ,最大n值与根据环氧乙烷加入量计算出的平均加成数基本吻合。采用直接进样质谱技术可同步分析含氧乙烯链的不同结构化合物的EO数分布曲线。选择大气压化学离子源检测时 ,样品与溶剂间的极性差异越小越好 ;而采用大气压电喷雾离子源时 ,溶剂极性对EO数的正态分布影响较小。对于EO数较大的化合物 ,宜采用大气压电喷雾源离子化 ,并可观察到多电荷体系 ;调节质谱参数将影响多电荷体系的分布。直接进样质谱技术为含氧乙烯链化合物的EO数分布提供了一条快速、简捷的分析途径。
By using atmospheric pressure ionization mass spectrometry, the distribution of oxyethylene chain degree of polymerization (EO number) of N-polyoxyethylene ether derivatives was studied by direct injection and the effects of O-polyoxyethylene ether derivatives and nonylphenol polyethoxylate The measurement was carried out. When the molecular weight of the compound is less than 100u, normal EO number distribution curves can be obtained by both ionization mass spectrometry with atmospheric pressure chemical ionization and atmospheric pressure electrospray ionization. The calculated average number of addition basically consistent. Simultaneous analysis of EO distribution curves of different structural compounds containing oxyethylene chain by direct injection mass spectrometry. When the atmospheric pressure chemical ion source is used for detection, the polarity difference between the sample and the solvent is as small as possible. However, the polarity of the solvent has little effect on the normal distribution of the EO number when using the atmospheric pressure spray ion source. For compounds with larger EO numbers, it is advisable to ionize using an electrospray ionization source and a multi-charge system can be observed; adjusting mass spectral parameters will affect the distribution of the multi-charge system. Direct injection mass spectrometry provides a quick and easy way to analyze the EO distribution of oxyethylene chain compounds.