气相色谱法测定胶粘剂中的游离甲醛

采用超声波萃取胶粘剂中游离甲醛，经2，4-二硝基苯肼衍生后用气相色谱一电子捕获检测器法测定．对提取方法、衍生化条件及色谱条件进行了研究，确定了甲醛检测的最佳条件．研究数据显示，该方法对甲醛的检出限为0．175μLg／g，在0．1～60．0μg／mL浓度范围内，线性相关系数R^2=0．9999；在1、2和8μg／mL3个添加水平下的添加回收率在98．97％-102．24％之间，5个实验室对同一样品中甲醛含量测定值的相对标准偏差为4．0％．结果表明本方法简便、快速、检测限低、回收率高、重现性好．

Determination of Free-formaldehyde in Adhesives by Gas Chromatography

A method for the determination of free - formaldehyde in adhesives by ultrasonic extraction, 2,4 - dinitrophenylhydrazine derivatization, and gas chromatography coupled with electron capture detection （ GC - ECD） has been developed. Optimum conditions of extraction, derivatization and chromatography were studied. The detection limit of this method for formaldehyde was 0. 175μg/g. The linear range was 0.1 ～60.0 μg/mL, R^2 = 0. 9999. The recoveries ranged from 98.97% to 102.24% at 1, 2 and 8 μg/mL. The relative standard deviation of formaldehyde content determined bv 5 laboratories was 4. 0%. Results showed that the method is convenient, rapid, and with low detection limit, high recovery, and high repeatability.