Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, 92093, United States.
Anal Chem. 2012 Jun 5;84(11):4798-804. doi: 10.1021/ac300373e. Epub 2012 May 17.
We present an analytical method for the in situ measurement of atmospheric nitrogen trifluoride (NF(3)), an anthropogenic gas with a 100-year global warming potential of over 16,000. This potent greenhouse gas has a rising atmospheric abundance due to its emission from a growing number of manufacturing processes and an expanding end-use market. Here we present a modified version of the "Medusa" preconcentration gas chromatography/mass spectrometry (GC/MS) system of Miller, B. R.; Weiss, R. F.; Salameh, P. K.; Tanhua, T.; Greally, B. R.; Mühle, J.; Simmonds, P. G. Anal. Chem.2008, 80 (5), 1536-1545. By altering the techniques of gas separation and chromatography after initial preconcentration, we are now able to make atmospheric measurements of NF(3) with relative precision <2% (1σ) for current background clean air samples. Importantly, this method augments the currently operational Medusa system, so that the quality of data for species already being measured is not compromised and NF(3) is measured from the same preconcentrated sample. We present the first in situ measurements of NF(3) from La Jolla, California made 11 times daily, illustrating how global deployment of this technique within the AGAGE (Advanced Global Atmospheric Gases Experiment) network could facilitate estimation of global and regional NF(3) emissions over the coming years.
我们提出了一种用于现场测量大气三氟化氮（NF3）的分析方法，NF3是一种人为排放的温室气体，其全球变暖潜能值超过 16000，达 100 年。由于越来越多的制造工艺排放和不断扩大的最终用途市场，这种温室效应极强的气体在大气中的含量不断增加。在此，我们对 Miller、B.R.；Weiss、R.F.；Salameh、P.K.；Tanhua、T.；Greally、B.R.；Mühle、J.和 Simmonds、P.G. 在《分析化学》2008 年第 80 卷第 5 期上发表的“Medusa”浓缩气相色谱/质谱（GC/MS）系统进行了修改。通过改变初始浓缩后气体分离和色谱技术，我们现在能够对当前背景清洁空气样本进行 NF3的相对精度 <2%（1σ）的现场测量。重要的是，该方法增强了当前运行的 Medusa 系统，从而不会影响正在测量的物种的数据质量，并且可以从同一浓缩样本中测量 NF3。我们首次提供了加利福尼亚州拉霍亚的 NF3现场测量结果，每日进行 11 次测量，说明了在未来几年内，在 AGAGE（大气全球气体实验）网络中全球部署该技术如何有助于估算全球和区域 NF3排放。
