浩瀚色谱采用气相色谱-氢火焰离子化检测法的环境空气非甲烷总烃(NMHC)连续自动监测设备之间的测量结果差异较大，影响光化学污染前体物的监测评价与管控.为探究测量差异原因，选取8套NMHC连续自动监测市售仪器，在不同色谱柱温度和不同标准气体条件下分析响应情况.结果表明：(1)柱温的改变对NMHC体积分数响应偏差影响较小.但在同样分析条件下，不同氢火焰离子检测器(FID)对卤代烃或含氧衍生物的响应因子不同，针对同一物质仪器之间的响应偏差较大，最大为170%. FID对物质响应的差异是导致测量结果差异大的主要原因.(2)环境空气中，各仪器现场获得的NMHC体积分数监测值变化趋势基本一致，仪器间数据的Pearson相关系数在0.8以上(P均小于0.01)；但非污染时段仪器间NMHC体积分数监测值最大相差近10倍，数据可比性差
名称：PQ甲烷柱
规格：1.5m*1/8
温度：250°C
编号：20231223001
应用：
1.环境空气中总烃，甲烷，非甲烷总烃的测定 气相色谱法
2.固定污染源废气中总烃，甲烷，非甲烷总烃的测定 气相色谱法
柱效高，分离好，氧和甲烷分离度大于1.5，峰型对称
The measurement results of continuous automatic monitoring equipment for non methane total hydrocarbons (NMHC) in ambient air using gas chromatography-hydrogen flame ionization detection method in Haohan Chromatography differ greatly, which affects the monitoring, evaluation, and control of photochemical pollution precursors. To explore the reasons for measurement differences, 8 sets of NMHC continuous automatic monitoring commercial instruments were selected, The response was analyzed under different column temperatures and standard gas conditions. The results showed that: (1) the change in column temperature had a small impact on the deviation of NMHC volume fraction response. However, under the same analysis conditions, different hydrogen flame ion detectors (FID) had different response factors for halogenated hydrocarbons or oxygen-containing derivatives, and the response deviation between instruments for the same substance was relatively large, with a maximum of 170% The difference in FID's response to substances is the main reason for the large difference in measurement results (2) In the ambient air, the trend of changes in the monitoring values of NMHC volume fraction obtained by various instruments on site is basically consistent, and the Pearson correlation coefficient of inter instrument data is above 0.8 (P<0.01); However, during non polluting periods, the maximum difference in NMHC volume fraction monitoring values between instruments is nearly 10 times, resulting in poor data comparability
Name: PQ Methane Column
Specification: 1.5m * 1/8
Temperature: 250 ° C
Number: 20231223001
Application:
1. Determination of total hydrocarbons, methane, and non methane total hydrocarbons in ambient air by gas chromatography
2. Determination of total hydrocarbons, methane, and non methane total hydrocarbons in exhaust gas from fixed pollution sources by gas chromatography
High column efficiency, good separation, oxygen and methane separation degree greater than 1.5, symmetrical peak shape
滕州市浩瀚色谱仪器技术服务有限公司
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