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浩瀚色譜采用氣相色譜-氫火焰離子化檢測法的環(huán)境空氣非甲烷總烴(NMHC)連續(xù)自動監(jiān)測設(shè)備之間的測量結(jié)果差異較大，影響光化學(xué)污染前體物的監(jiān)測評價與管控.為探究測量差異原因，選取8套NMHC連續(xù)自動監(jiān)測市售儀器，在不同色譜柱溫度和不同標(biāo)準(zhǔn)氣體條件下分析響應(yīng)情況.結(jié)果表明：(1)柱溫的改變對NMHC體積分?jǐn)?shù)響應(yīng)偏差影響較小.但在同樣分析條件下，不同氫火焰離子檢測器(FID)對鹵代烴或含氧衍生物的響應(yīng)因子不同，針對同一物質(zhì)儀器之間的響應(yīng)偏差較大，最大為170%. FID對物質(zhì)響應(yīng)的差異是導(dǎo)致測量結(jié)果差異大的主要原因.(2)環(huán)境空氣中，各儀器現(xiàn)場獲得的NMHC體積分?jǐn)?shù)監(jiān)測值變化趨勢基本一致，儀器間數(shù)據(jù)的Pearson相關(guān)系數(shù)在0.8以上(P均小于0.01)；但非污染時段儀器間NMHC體積分?jǐn)?shù)監(jiān)測值最大相差近10倍，數(shù)據(jù)可比性差
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名稱：PQ甲烷柱
規(guī)格：1.5m*1/8
溫度：250°C
編號：20231223001
應(yīng)用：
1.環(huán)境空氣中總烴，甲烷，非甲烷總烴的測定 氣相色譜法
2.固定污染源廢氣中總烴，甲烷，非甲烷總烴的測定 氣相色譜法
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柱效高，分離好，氧和甲烷分離度大于1.5，峰型對稱
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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
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