| Establishment and Evaluation of a Method for Analyzing Atmospheric Volatile Organic Compounds |
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| 作者姓名： | 孙扬 王跃思 修天阳 王迎红 徐新 |
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| 作者单位： | Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| 基金项目： | This work was supported by the National High Technology Research and Development Program of China(863 Program) (No. 2006AA06A301) and the National Basic Research Program of China (973 Program) (No.2007CB407303) |
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| 摘 要： | An automated cumulative sampling system and a method that combines a two-step cryo-concentrated system and gas chromatography/mass spectrometry （CCS-GC/MS） are introduced. The method is evaluated by a set of special experiments and the results are presented. The lowest measurement detection limit was expanded from 10^-6 nmol mol^-1 to 10^-12 nmol mol^-1 by using CCS-GC/MS instead of the simpler method of gas chromatography/mass spectrometry （GC/MS）, with the average responsible factor of 39 object compounds being 2.9 × 10^-12. When the volume of air sample reached 1000 cm^3, the lowest detection limit reached up to 7 × 10^-12-40 × 10^-12 nmol mol^-1. The CCS-GC/MS method can potentially identify all objective chemical species in an atmospheric sample, with an average 2.5 s bias error of retention time for 39 gas chromatography （GC） peaks. Within the range 0-400×10^-9 nmol mol^-1, the concentration of 39 kinds of objective compounds can be individually calculated very accurately by a standard curve average r^2 （coefficient of determination） value of above 0.99]. The recovery efficiency was 88%-111%, with an average of 100.8% ±5.6%. The bias error of precision was 2%-14%, with an average of 6.6%.
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| 关 键 词： | 大气污染 挥发性有机化合物 偏移误差 低温浓缩系统 |
| 收稿时间： | 15 March 2006 |
| 修稿时间： | 2006-03-152006-11-26 |
Establishment and evaluation of a method for analyzing atmospheric volatile organic compounds |
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| Sun?Yang,Wang?Yuesi,Xiu?Tianyang,Wang?Yinghong,Xu?Xin.Establishment and Evaluation of a Method for Analyzing Atmospheric Volatile Organic Compounds[J].Advances in Atmospheric Sciences,2007,24(4):679-687. |
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| Authors: | Sun Yang Wang Yuesi Xiu Tianyang Wang Yinghong Xu Xin |
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| Institution: | Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | An automated cumulative sampling system and a method that combines a two-step cryo-concentrated system
and gas chromatography/mass spectrometry (CCS-GC/MS) are introduced. The method is evaluated by a set of special
experiments and the results are presented. The lowest measurement detection limit was expanded from 10-6 nmol
mol-1 to 10-12 nmol mol-1 by using CCS-GC/MS instead of the simpler method of gas chromatography/mass
spectrometry (GC/MS), with the average responsible factor of 39 object compounds being 2.9×10-12. When
the volume of air sample reached 1000 cm3, the lowest detection limit reached up to 7×10-12--40×10-12
nmol mol-1. The CCS-GC/MS method can potentially identify all objective chemical species in an atmospheric sample,
with an average 2.5 s bias error of retention time for 39 gas chromatography (GC) peaks. Within the range
0--400×10-9 nmol mol-1, the concentration of 39 kinds of objective compounds can be individually calculated
very accurately by a standard curve average r2 (coefficient of determination) value of above 0.99]. The recovery
efficiency was 88%--111%, with an average of 100.8% ±5.6%. The bias error of precision was 2%--14%, with an
average of 6.6%. |
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| Keywords: | atmosphere cryo-concentration volatile organic compounds (VOCs) evaluation bias error |
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