Determination of N-ethyl morpholine in Air of Workplace by Gas Chromatography / 环境与健康杂志

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 ?g/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.