Keywords gas chromatography;extraction;epichlorohydrin;1;3 dichloropropanol;micro organic impurity;3 chloro 2 hydroxypropyl trimethyl ammonium chloride;

• 气相色谱法;萃取;环氧氯丙烷;1;3二氯丙醇;微量有机杂质;3氯2羟丙基三甲基氯化铵;