Mass spectrometer characterization of halogen gases in air at atmospheric pressure.
Mass spectrometer characterization of halogen gases in air at atmospheric pressure.
复制标题
大气压下空气中卤素气体的质谱仪表征。
DOI：
10.1021/ac0487707
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发表时间：
2005
影响因子：
7.4
通讯作者：
Foster,KrishnaL
中科院分区：
文献类型：
--
作者：
Ivey,MichelleM;Foster,KrishnaL
我们已经开发了一种新的接口，商用离子阱质谱仪配备APCI能够实时测量的气态化合物的检测限的顺序pptv。新的接口已被测试使用的检测Br 2和Cl 2在合成海水冰在大气压下作为一个模型系统。机械泵用于将气体混合物通过玻璃歧管吸入电晕放电区，在电晕放电区分子被电离。对干燥空气中溴和氯的分析表明，离子强度受抽气速率和玻璃歧管位置的影响。Br 2的质谱仪信号在0.1 - 10.6 ppbv范围内呈线性，估计的3σ检测限为20 pptv。Cl 2的MS信号在0.2 - 25 ppbv范围内呈线性，估计的3σ检测限为1 ppbv。这种新的接口通过对市售离子阱质谱仪进行实际修改来推进分析化学领域，该离子阱质谱仪扩展了在大气压下对空气中的气体进行高度特异性和灵敏度测量的可用方法。
We have developed a new interface for a commercial ion trap mass spectrometer equipped with APCI capable of real-time measurements of gaseous compounds with limits of detection on the order of pptv. The new interface has been tested using the detection of Br2and Cl2over synthetic seawater ice at atmospheric pressure as a model system. A mechanical pump is used to draw gaseous mixtures through a glass manifold into the corona discharge area, where the molecules are ionized. Analysis of bromine and chlorine in dry air show that ion intensity is affected by the pumping rate and the position of the glass manifold. The mass spectrometer signals for Br2are linear in the 0.1−10.6 ppbv range, and the estimated 3σ detection limit is 20 pptv. The MS signals for Cl2are linear in the 0.2−25 ppbv range, and the estimated 3σ detection limit is 1 ppbv. This new interface advances the field of analytical chemistry by introducing a practical modification to a commercially available ion trap mass spectrometer that expands the available methods for performing highly specific and sensitive measurements of gases in air at atmospheric pressure.