摘要
基于低温捕集技术、中心切割技术、气相色谱氢火焰离子检测器(GC-FID)检测技术,搭建了环境空气中57种臭氧前体物(PAMS)在线监测装置,建立了低温捕集-中心切割-气相色谱氢火焰离子检测的在线环境空气中57种PAMS的分析方法。样气依次经过除水、除二氧化碳、低温捕集和热脱附后,通过中心切割,20种C_(2)~C_(5)的物质分切到PLOT色谱柱分离,由1号FID检测器分析,其余37种C_(6)~C_(12)的物质切换到DB-1色谱柱分离,由2号FID检测器分析,57种臭氧前体物均采用外标标准曲线法定量。探讨了不同捕集管长度对57种臭氧前体物的捕集效率的影响,并评估了该装置的方法性能指标。实验结果表明,盘管(30 cm)的捕集效率最高,捕集物种最全;57种目标化合物的峰面积与浓度呈线性相关,相关系数(r)为0.991~0.99957,最低点的测量平均值与标准值的相对误差为-10.67%~11.33%,准确度为-4.15%~1.75%,精密度为0.75%~3.52%,方法检出限为0.022~0.099 nmol/mol;57种目标化合物的各项性能均能满足HJ 1010标准的要求;该装置及其方法能够满足57种臭氧前体物连续在线监测要求。
An on-line monitoring device for 57 ozone precursors(PAMS)in ambient air was established based on ultra-low temperature cold trap enrichment technology,center-cut technology,gas chromatography separation technology and hydrogen flame ion detection(FID)detection technology,and an online analysis method for 57 PAMS in ambient air by low temperature trapping,center cutting and gas chromatography was established.After water removal,carbon dioxide removal,low temperature capture and thermal desorption,through the center-cut technology,the 20 substances of C_(2)~C_(5)were switched to PLOT column for separation and analysis by the No.1 FID detector,and the 37 substances of the remaining C_(6)~C_(12)were switched to DB-1 column for separation and analysis by the No.2 FID detector,57 ozone precursors were quantified by the external standard curve method.The experimental results show that the coil tube(30 cm)had the highest trapping efficiency and the most complete species.The peak area was linearly correlated with the concentration of 57 target compounds,and the correlation coefficient(r)was 0.991~0.99957,the relative error between the mean value of the lowest measurement and the standard value was-10.67%~11.33%,the accuracy was-4.15%~1.75%,the precision was 0.75%~3.52%,and the detection limit of the method was 0.022~0.099 nmol/mol.All the performance of 57 target compounds meets the requirements of HJ 1010 standard.The device and its method meet the requirements of continuous on-line monitoring of 57 ozone precursors.
作者
胡超
李虹杰
HU Chao;LI Hongjie(Wuhan Tianhong Environmental Protection Technology Co.,Ltd.,Wuhan 430223,China)
出处
《山东化工》
2025年第2期182-187,共6页
Shandong Chemical Industry
关键词
臭氧前体物
氢火焰离子检测器
低温捕集
中心切割
在线监测
ozone precursors
hydrogen flame ion detector
low temperature trapping
center cutting
on-line monitoring
