名稱：HH-Tamine30毛細管柱

規格：30m*0.32mm*5.0um

高使用溫度：280°C

甲胺(Methylamine，CH3NH2)和二甲胺(Dimethylamine，CH3)2NH)均為無色、有特殊氣味、屬中等急性毒性的物質，水溶液均為中強堿性，在空氣中爆炸極限，甲胺為4.9-20.7%(φ)，二甲胺為2.8-14.4%。一甲胺沸點為-6℃，20℃蒸氣壓為304kPa。二甲胺沸點為6.88℃，20℃時的蒸氣壓為173.9kPa(1307.2mmHg)。我國研制車間空氣中一甲胺和二甲胺的測定方法都為分光光度法，該方法干擾大，不能對一甲胺、二甲胺等同時測定。


浩瀚色譜（山東）應用技術開發有限公司，結合我國國情建立用多孔玻板吸收管吸收液同時采集空氣中一甲胺、二甲胺，頂空進樣氣相色譜毛細管柱分離，FID檢測器測定的方法。

頂空氣相色譜法測工作場所空氣中一甲胺、二甲胺  測試譜圖：


Determination of Monomethylamine and Dimethylamine in Workplace Air by Headspace Gas Chromatography

Details of determination of monomethylamine and dimethylamine in the air of workplace by headspace gas chromatography:



Name: HH-Tamine30 capillary column



Specification: 30m * 0.32mm * 5.0um



Maximum operating temperature: 280 ° C



Methylamine (CH3NH2) and dimethylamine (CH3) 2NH（ φ)， Dimethylamine is 2.8-14.4%. The boiling point of monomethylamine is - 6 ℃, and the vapor pressure at 20 ℃ is 304kPa. The boiling point of dimethylamine is 6.88 ℃, and the vapor pressure at 20 ℃ is 173.9kPa (1307.2mmHg). The determination method of monomethylamine and dimethylamine in the air of research and development workshops in China is spectrophotometry. This method has great interference and cannot be used to determine monomethylamine and dimethylamine at the same time.




Haohan Chromatographic (Shandong) Application Technology Development Co., Ltd. has established a method for simultaneous collection of monomethylamine and dimethylamine in the air with the absorption solution of porous glass plate absorption tube, headspace sampling gas chromatography capillary column separation, and FID detector determination based on the national conditions of China.



Test spectrogram of methylamine and dimethylamine in the air of workplace by headspace gas chromatography: