然而，甲烷在環(huán)境空氣總烴中占有絕大部分含量，儀器測量中的各種誤差，導(dǎo)致差減法得到的非甲烷總烴含量的計算值誤差偏大，極端條件下甚會出現(xiàn)總烴測量值小于甲烷測量值的情況，差減后出現(xiàn)非甲烷總烴計算值是負(fù)值的尷尬情況。

浩瀚色譜（山東）應(yīng)用技術(shù)開發(fā)有限公司,，研發(fā)直接測量非甲烷總烴的直測法，以便精確穩(wěn)定地檢測環(huán)境vocs污染，避免了總烴減去甲烷出現(xiàn)負(fù)值的情況，柱效高，結(jié)果準(zhǔn)確。

名稱：甲烷填充柱

粒度：60-80目

規(guī)格：1m*1/8

高溫度：270℃    

應(yīng)用：非甲烷總烴的直接測定  氣相色譜法

在線/便攜使用非甲烷總烴直測填充柱 測試譜圖：





Determination of purity of N - methyldiethanolamine for industrial use Capillary column

Details of capillary column for purity determination of N - methyldiethanolamine for industrial use:



Haohan Chromatography (Shandong) Application Technology Development Co., Ltd. has established a capillary gas chromatography method for the simultaneous determination of MDEA and piperazine (PIP) in N-methyldiethanolamine (MDEA) decarburizer. The experimental results were verified by GC-MS, and the effects of different chromatographic columns, solvents, and dehydrating agents on the determination results were investigated. The experimental results show that the content of MDEA and PIP in MDEA decarburizer can be determined simultaneously by using HH-1 capillary column, hydrogen flame ionization detector, methanol as solvent, sample without dehydration and external standard method for quantification. The determination results are as follows: the MDEA content in MDEA decarburizer stock solution is 99.0%~99.3% (w), and the PIP content is 10.1%~10.4% (w); The MDEA content in the working solution of MDEA decarburizer is 41.4%~42.9% (w), and the PIP content is 7.3%~8.2% (w); The recovery rate of MDEA is 96.43%~99.98%, and that of PIP is 96.64%~102.02%; MDEA detection limit is 0.21 μ G/L, PIP detection limit is 0.29 μ g/L。 This method has the characteristics of simple operation, fast analysis speed, accuracy, good separation effect and high precision, which can meet the analysis requirements in the factory production and quality inspection process.






Name: capillary column



Stationary phase: 100% dimethylpolysiloxane



Specification: 60m * 0.53mm * 5um



Model: HH-1

Application: N - methyldiethanolamine for industrial use




Capillary column test spectrogram for purity determination of N - methyldiethanolamine for industrial use: