污染控制技术及原理
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CH4[J].环境科学学报,2010,30(9):1766-1771
配备低压进样系统的GC-FID法测大气中的CO和CH4
- Determination of atmospheric CO and CH4 by GC-FID equipped with a low-pressure injector
- 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)
- 吴丽玲
- 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
- 曾立民
- 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
- 于雪娜
- 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
- 邵敏
- 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
- 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、5Å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DonaldR.Blake实验室针对CO、CH4比对的相对误差分别低3%和1%.
- 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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