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Quantitative response to nitrite from field-induced decomposition of the chloride adduct of RDX by reactive stage tandem ion mobility spectrometry
Analyst ( IF 3.6 ) Pub Date : 2020-10-30 , DOI: 10.1039/d0an01778g Umesh Chiluwal 1, 2, 3, 4 , Gary A. Eiceman 1, 2, 3, 4
Analyst ( IF 3.6 ) Pub Date : 2020-10-30 , DOI: 10.1039/d0an01778g Umesh Chiluwal 1, 2, 3, 4 , Gary A. Eiceman 1, 2, 3, 4
Affiliation
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An additional dimension of selectivity for the determination of RDX by ion mobility spectrometry (IMS) was introduced through field-induced decomposition of RDX·Cl− to NO2− on a spectral baseline free of interfering peaks. In this variant of reactive stage tandem IMS, the explosive ion is decomposed selectively in the presence of an interferent and from significantly convolved peaks which were mobility isolated within a narrow range of drift times using dual ion shutters. Field-induced decomposition at 170 °C and field strength of 112 Td (∼16 kV cm−1) provided 15% decomposition yield and RDX, amid interferent, was detected decisively even when peaks differed in reduced mobility coefficients (Ko) by only 0.02 cm2 V−1 s−1. A nitrite peak with S/N of 8.5 was observed with vapour concentrations of 54 ppb for RDX and 329 ppb for Interferent A in the ionization volume corresponding to 2 ng of RDX and 100 ng of Interferent A deposited on sample traps in the thermal desorption inlet. Findings on quantitative response suggest the presence of excessive amounts of interferent caused ionization suppression of RDX. Still, RDX was determined quantitatively using sequential processing of ions by mobility isolation, selective field induced decomposition, and mobility analysis in a second drift region.
中文翻译：
反应级串联离子迁移谱法对RDX氯化物加合物的场诱导分解对亚硝酸盐的定量响应
选择性为RDX的通过离子迁移谱（IMS）的确定的额外维度通过RDX·氯的电场感应分解引入-以NO 2 -在自由干扰峰的光谱基线。在反应级串联IMS的此变体中，爆炸离子在存在干扰物的情况下有选择地分解，并使用双离子百叶窗从显着卷积的峰中分离出来，这些峰在很短的漂移时间内被隔离。在170°C的磁场诱导下的分解和112 Td（〜16 kV cm -1）的场强提供了15％的分解产率，即使在降低的迁移系数（K o）仅0.02 cm 2 V -1 s -1。观察到亚硝酸盐峰的S / N为8.5，RDX的蒸气浓度为54 ppb，干扰素A的蒸气浓度为329 ppb，分别对应于2 ng RDX和100 ng干扰素A沉积在热脱附入口的样品阱上。关于定量响应的发现表明存在过量的干扰物，导致RDX受到电离抑制。尽管如此，仍使用离子的顺序处理，通过迁移率隔离，选择性场诱导的分解以及第二漂移区中的迁移率分析来定量确定RDX。
更新日期：2020-11-12
中文翻译：
反应级串联离子迁移谱法对RDX氯化物加合物的场诱导分解对亚硝酸盐的定量响应
选择性为RDX的通过离子迁移谱（IMS）的确定的额外维度通过RDX·氯的电场感应分解引入-以NO 2 -在自由干扰峰的光谱基线。在反应级串联IMS的此变体中，爆炸离子在存在干扰物的情况下有选择地分解，并使用双离子百叶窗从显着卷积的峰中分离出来，这些峰在很短的漂移时间内被隔离。在170°C的磁场诱导下的分解和112 Td（〜16 kV cm -1）的场强提供了15％的分解产率，即使在降低的迁移系数（K o）仅0.02 cm 2 V -1 s -1。观察到亚硝酸盐峰的S / N为8.5，RDX的蒸气浓度为54 ppb，干扰素A的蒸气浓度为329 ppb，分别对应于2 ng RDX和100 ng干扰素A沉积在热脱附入口的样品阱上。关于定量响应的发现表明存在过量的干扰物，导致RDX受到电离抑制。尽管如此，仍使用离子的顺序处理，通过迁移率隔离，选择性场诱导的分解以及第二漂移区中的迁移率分析来定量确定RDX。
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