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.
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