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建立了快速测定纺织助剂中双（氢化牛脂基）二甲基季铵化合物（ DHTDMAC）的超高效液相色谱-串联质谱（UPLC-MS／MS）分析方法。样品经5％（v／v）甲酸甲醇超声波提取、稀释后，采用Eclipse Plus C18柱（50 mm×2.1 mm，1.8μm）分离，甲醇和0.1％（ v／v）甲酸水溶液为流动相梯度洗脱，电喷雾离子源正离子多反应监测模式进行定性和定量分析。实验结果表明，DHTDMAC在10~280μg／L范围内与峰面积呈良好的线性关系，相关系数（ r2）为0.9991；以不低于3倍信噪比计算方法检出限（ LOD，S／N=3）为3 mg／kg；方法定量限（ LOQ，S／N=10）为10 mg／kg。3种纺织助剂基质中 DHTDMAC 在3个不同加标水平的平均回收率为97.2％~108.3％，相对标准偏差（ RSD）为1.5％~4.6％。该方法灵敏度高、操作简便、快速准确，适用于纺织助剂中 DHTDMAC的分析测定。

A method has been developed for the determination of di( hydrogenated tallow alkyl)dimethyl ammonium compounds( DHTDMAC ) in textile auxiliaries by ultra-high per-formance liquid chromatography-tandem mass spectrometry ( UPLC-MS/MS ). The samples were extracted and diluted with acidified methanol by 5%( v/v)formic acid under ultrasonic assistance. The separation was performed on an Eclipse Plus C18 column( 50 mm × 2. 1 mm, 1. 8 μm)using 0. 1%( v/v)formic acid solution and methanol as the mobile phases. Identifica-tion and quantification were achieved by UPLC-MS/MS with electrospray ionization ( ESI ) source in positive ion mode and multiple reaction monitoring( MRM)mode. The results indica-ted that the calibration curve of DHTDMAC showed good linear relationship between peak area and mass concentration in the range of 10-280 μg/L with the correlation coefficient( r2)of 0. 999 1. The limit of detection( LOD,S/N=3)and the limit of quantification( LOQ,S/N=10) of this method were 3 mg/kg and 10 mg/kg,respectively. The average recoveries from three typical textile auxiliary matrices including dispersant,anti-static agent and fabric softener,at three spiked levels were in the range of 97. 2%-108. 3% with the relative standard deviations ( RSDs)of 1. 5%-4. 6%. The method is sensitive,accurate,simple and effective for the analysis of DHTDMAC in textile auxiliaries.