甲烷柱直接法測(cè)定大氣中的非甲烷烴，總烴，非甲烷總烴，液化石油氣，植物油，6號(hào)溶劑，脂肪酸，三甲胺，二甲醚，甲醛，甲酸

甲烷柱直接法測(cè)定大氣中的非甲烷烴
甲烷柱直接法測(cè)定大氣中的非甲烷烴 詳細(xì)信息：

固定相：高分子小球

GDX-502，2m*3mm，2m*4mm，2m*1/8，60-80目

甲烷柱

總烴柱

2m*3mm，2m*4mm，2m*1/8，硅烷化玻璃微球

4個(gè)季節(jié)大氣56種非甲烷碳?xì)浠衔?NMHCs)進(jìn)行在線監(jiān)測(cè)分析.從成分來(lái)看,四季總NMHCs平均濃度為23.6×10-9,呈現(xiàn)出冬季＞秋季＞夏季≈春季的變化特征,其中烷烴比例高(65.4%~74.7%),其次是芳香烴(13.3%~21.7%)和烯烴(7.1%~11.6%),丙烷、甲苯、乙烷、正己烷、正丁烷、乙炔、2-甲基戊烷、異丁烷、乙烯和3-甲基戊烷是濃度高的10個(gè)物種.相關(guān)性和日變化分析表明,深圳大氣中NMHCs受到機(jī)動(dòng)車、溶劑揮發(fā)相關(guān)工業(yè)源以及植物釋放等多重來(lái)源的共同影響,其中甲苯、2-甲基戊烷、3-甲基戊烷和正己烷受工業(yè)源影響為顯著,而異戊二烯主要來(lái)自于天然源.
滕州市浩瀚色譜儀器技術(shù)服務(wù)有限公司，介紹了在２個(gè)監(jiān)測(cè)點(diǎn)，用直接法測(cè)定大氣中的非甲烷烴。測(cè)定方法的檢出限可達(dá)０．００６５ｍｇ／ｍ＾３，在線性范圍０－１０ｍｇ／ｍ＾３時(shí)，線性相關(guān)系數(shù)為０．９９９５，相對(duì)標(biāo)準(zhǔn)焦慮差為２．８％。結(jié)果表明，由于大氣逆溫層、工業(yè)排放源、汽車排氣對(duì)非甲烷烴的濃度變化產(chǎn)生影響，其日變化曲線呈雙峰形。

甲烷柱直接法測(cè)定大氣中的非甲烷烴 圖片：


Direct determination of non-methane hydrocarbons in the atmosphere by methane column
Direct determination of non-methane hydrocarbons in the atmosphere by methane column direct method:

Stationary phase: polymer pellet
GDX-502, 2m*3mm, 2m*4mm, 2m*1/8, 60-80 mesh
Methane column

Total hydrocarbon column
2m*3mm, 2m*4mm, 2m*1/8, silanized glass microspheres


On-line monitoring and analysis of 56 non-methane hydrocarbons (NMHCs) in the four seasons. From the compositional point of view, the average concentration of total NMHCs in the four seasons was 23.6×10-9, showing the characteristics of winter>autumn>summer and spring. The highest proportion of alkanes (65.4%~74.7%), followed by aromatic hydrocarbons (13.3%~21.7%) and olefins (7.1%~11.6%), propane, toluene, ethane, n-hexane, n-butane, acetylene, 2- Methyl pentane, isobutane, ethylene and 3-methylpentane are the highest concentrations of 10 species. Correlation and daily variation analysis indicate that NMHCs in the atmosphere of Shenzhen are subject to motor vehicles, solvent volatilization-related industrial sources, and plant release. The combined effects of multiple sources, among which toluene, 2-methylpentane, 3-methylpentane and n-hexane are most affected by industrial sources, and isoprene mainly comes from natural sources.
Tengzhou Haohao Chromatography Instrument Technology Service Co., Ltd. introduced the determination of non-methane hydrocarbons in the atmosphere by direct method at two monitoring points. The detection limit of the determination method was up to 0.0065 mg/m^3. In the linear range of 0-10 mg/m^3, the linear correlation coefficient was 0.9995, and the relative standard anxiety difference was 2.8%. The results show that the daily variation curve is bimodal due to the influence of atmospheric inversion layer, industrial emission source and automobile exhaust on the concentration change of non-methane hydrocarbons.

Determination of non-methane hydrocarbons in the atmosphere by direct methane column method