【摘要】 目的建立工作场所空气中N-乙基吗啉的气相色谱测定法。方法硅胶吸收管采集空气中N-乙基吗啉,乙醇洗脱解析,在实验室条件下,按照《车间空气监测检验方法研究规范》的要求,研究该方法的线性范围、精密度、准确度、检出限;并模拟现场进行样品采样效率、解吸效率、穿透容量、样品稳定性实验。结果N-乙基吗啉线性范围为0.025～20mg/ml,相关系数为0.9998;相对标准偏差为3.2%～3.9%;加标回收率为101.00%～102.43%,检出限为0.294μg/ml,定量下限为0.49μg/ml,最低检出浓度0.327μg/m3,解吸效率为96.08%～98.73%;穿透容量为14.37mg(100mg硅胶),样品稳定性为7d。结论利用气相色谱法监测工作场所空气中N-乙基吗啉的浓度具有较高的灵敏度和较好的精密度、准确度,样品采集方法简便,适用于工作场所空气中N-乙基吗啉浓度测定。更多还原

【Abstract】 Objective To establish a GC analytical method for the determination of N-ethyl morpholine in the air of workplace.Methods N-ethyl morpholine in the air of workplace was collected by silica gel tube, desorbed by ethanol, and according to The Criterion of Detection Methods for the Air of Workplace, the linearity range, precision, accuracy and limit of detection were determined by the GC under a certain experimental condition and the experiments of sampling efficiency , the desorption efficiency, penetrating capability and the stability of sample were carried.Results The linear range of N-ethyl morpholine was 0.025-20 mg/ml(r=0.999 8);Relative standard deviations were 3.2%-3.9%;the rates of recovery were 101.00%-102.43%(n=18), the limit of detection was 0.49 μg/ml, the desorption efficiency was 96.10%-98.73%, the penetrating capability was 14.37 mg(100 g silica gel), and the content of samples were reduced less than 10% percent at the ninth day.Conclusion The method has higher sensitivity, better precision, accuracy, simple sampling, accurate and stable results.It can be used as an effective monitoring method to detect N-ethyl morpholine in the air of workplace.更多还原