，20℃蒸氣壓為304kPa。二甲胺沸點(diǎn)為6.88℃，20℃時(shí)的蒸氣壓為173.9kPa(1307.2mmHg)。我國(guó)研制車間空氣中一甲胺和二甲胺的測(cè)定方法都為分光光度法，該方法干擾大，不能對(duì)一甲胺、二甲胺等同時(shí)測(cè)定。


浩瀚色譜（山東）應(yīng)用技術(shù)開發(fā)有限公司，結(jié)合我國(guó)國(guó)情建立用多孔玻板吸收管吸收液同時(shí)采集空氣中一甲胺、二甲胺，頂空進(jìn)樣氣相色譜毛細(xì)管柱分離，F(xiàn)ID檢測(cè)器測(cè)定的方法。

頂空氣相色譜法測(cè)工作場(chǎng)所空氣中一甲胺

、二甲胺  測(cè)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: