工作场所空气中二甲胺的溶剂解吸气相色谱测定法研究
Study on the Method for Determination of Dimethylamine in the Air of Workplace by Solvent Desorption/Gas Chromatography
-
摘要:
目的 建立工作场所空气中二甲胺的溶剂解吸气相色谱测定方法。 方法 采用硅胶管吸附空气中二甲胺,用酸性醇溶液解吸, 再用碱性溶液中和后, 进样气相色谱, 使用高液担比的碱性色谱柱分离, FID检测器测定。 结果 该方法在测定范围 79.7~478.2 μg/mL时, 线性方程为& #375;=1 040.2x-25 148(r=0.999 9)。最低检出限为 5 μg/mL; 最低检出浓度为 1.3 mg/m3(采样体积 7.5 L); 解吸效率 86%~91%; 穿透容量 >7.75 mg(200 mg硅胶); 样品于 4℃冰箱内可保存 7 d。 结论 本研究建立的方法适合于工作场所空气中二甲胺浓度的监测。 Abstract:Objective To develop a method for the determination of dimethylamine in the air of workplace by solvent desorption/gas chromatography. Methods Dimethylamine in the air was sampled by silica gel tube and then desorbed by alcoholic solution with little acid. After neutralized by alkali, the solution was separated by basic column and detected by GCFID. Results The liner equation was & #375;=1 040.2x-25 148(r=0.999 9)in the concentration range of 79.7-478.2 μg/mL. The detection limit was 5 μg/mL; the minimum detectable concentration was 1.3 mg/m3(the air sample was 7.5 L). The desorption efficient was 86%-91%.The breakthrough volumes was more than 7.75 mg(200 mg silica gel). The sample could stay 7 d at 4℃ in the refrigerator. Conclusion The method is suitable for the determination of dimethylamine in the air of workplace.
下载:
