【摘要】 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-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0.175μg/g,在0.1~60.0μg/mL浓度范围内,线性相关系数R2=0.9999;在1、2和8μg/mL 3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.更多还原

【Abstract】 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 0.175 μg/g.The linear range was 0.1~60.0 μg/mL,R2 =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 by 5 laboratories was 4.0%.Results showed that the method is convenient,rapid,and with low detection limit,high recovery and high repeatability.更多还原