| 配备低压进样系统的GC-FID法测大气中的CO和CH_4 |
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| 引用本文： | 吴丽玲,曾立民,于雪娜,邵敏.配备低压进样系统的GC-FID法测大气中的CO和CH_4[J].环境科学学报,2010,30(9):1766-1771. |
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| 作者姓名： | 吴丽玲 曾立民 于雪娜 邵敏 |
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| 作者单位： | 北京大学环境科学与工程学院,环境模拟与污染控制国家重点联合实验室,北京100871 |
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| 基金项目： | 国家高技术研究发展计划(863)项目（No.2006AA06A308）；北京市科学技术委员会资助项目（No.D09040903670903）；环保科研专项经费资助（No.200809122） |
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| 摘 要： | 将自主研发的低压进样系统与GC-FID法相结合,解决了低压样气难以抽取进样的技术难题,实现了对SUMMA采样罐内低压样气中CO、CH4的分析.罐内样气压强大于30kPa情况下,该进样装置能将待测低压气体提升至常压状态并完成进样过程.本系统采用3个六通阀、5分子筛与TDX-01双柱实现O2、CO、CH4的有效分离.通过对5分子筛柱的反吹去除杂质组份,既保持基线平稳,又可缩短分析周期,提高效率.该分析系统CO、CH4的最低检出限分别为9.2×10-9、5.5×10-9.本分析系统与美国加州大学Irvine分校Donald R.Blake实验室针对CO、CH4比对的相对误差分别低3%和1%.
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| 关 键 词： | 气相色谱 FID CO CH4 低压进样装置 |
| 收稿时间： | 2010/1/23 0:00:00 |
| 修稿时间： | 4/2/2010 11:54:41 AM |
Determination of atmospheric CO and CH4 by GC-FID equipped with a low-pressure injector |
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| WU Liling,ZENG Limin,YU Xuena and SHAO Min.Determination of atmospheric CO and CH4 by GC-FID equipped with a low-pressure injector[J].Acta Scientiae Circumstantiae,2010,30(9):1766-1771. |
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| Authors: | WU Liling ZENG Limin YU Xuena and SHAO Min |
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| Institution: | State Key Joint Laboratory of Environment Simulation and Pollution Control, College of Environmental Science and Engineering, Peking University, Beijing 100871,State Key Joint Laboratory of Environment Simulation and Pollution Control, College of Environmental Science and Engineering, Peking University, Beijing 100871,State Key Joint Laboratory of Environment Simulation and Pollution Control, College of Environmental Science and Engineering, Peking University, Beijing 100871 and State Key Joint Laboratory of Environment Simulation and Pollution Control, College of Environmental Science and Engineering, Peking University, Beijing 100871 |
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| Abstract: | An improved GC-FID equipped with a self-designed low-pressure injector was developed for the determination of low-pressure COand CH4 from the SUMMAcanister.The self-designed injector can increase the sample pressure from lower to 30kPa in the canister to 100kPa effectively.The improved system could successfully separate O2,COand CH4 with a combination of three 6-port valves,two columns(5Å and TDX-01) and back-flushing techniques.The 5Å packed column used as pre-column can remove impurities effectively,keep the baseline smooth and enhance analytical efficiency.The detection limit of the improved GC-FIDmethod can reach 9.2 × 10-9 for COand 5.5 × 10-9 for CH4.International inter-comparison between the laboratories of Peking University and University of California Irvine was conducted and the relative errors between the two laboratories for COand CH4 were below 3% and 1%,respectively. |
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| Keywords: | Gas chromatography FID carbon monoxide methane low pressure injector |
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