产品名称：	GDX-502 甲烷柱直接法测定大气中的非甲烷烃
产品型号：	GDX-502
品牌：	1941
产品数量：
产品单价：	面议
日期:	2023-07-06

GDX-502 甲烷柱直接法测定大气中的非甲烷烃的详细资料

甲烷柱直接法测定大气中的非甲烷烃
甲烷柱直接法测定大气中的非甲烷烃 详细信息：

固定相：高分子小球

GDX-502，2m*3mm，2m*4mm，2m*1/8，60-80目

甲烷柱

总烃柱

2m*3mm，2m*4mm，2m*1/8，硅烷化玻璃微球

4个季节大气56种非甲烷碳氢化合物(NMHCs)进行在线监测分析.从成分来看,四季总NMHCs平均浓度为23.6×10-9,呈现出冬季＞秋季＞夏季≈春季的变化特征,其中烷烃比例高(65.4%~74.7%),其次是芳香烃(13.3%~21.7%)和烯烃(7.1%~11.6%),丙烷、甲苯、乙烷、正己烷、正丁烷、乙炔、2-甲基戊烷、异丁烷、乙烯和3-甲基戊烷是浓度高的10个物种.相关性和日变化分析表明,深圳大气中NMHCs受到机动车、溶剂挥发相关工业源以及植物释放等多重来源的共同影响,其中甲苯、2-甲基戊烷、3-甲基戊烷和正己烷受工业源影响为显著,而异戊二烯主要来自于天然源.
滕州市浩瀚色谱仪器技术服务有限公司，介绍了在２个监测点，用直接法测定大气中的非甲烷烃。测定方法的检出限可达０．００６５ｍｇ／ｍ＾３，在线性范围０－１０ｍｇ／ｍ＾３时，线性相关系数为０．９９９５，相对标准焦虑差为２．８％。结果表明，由于大气逆温层、工业排放源、汽车排气对非甲烷烃的浓度变化产生影响，其日变化曲线呈双峰形。

甲烷柱直接法测定大气中的非甲烷烃 图片：


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