Hyperfast Flow-Field Thermal Gradient GC/MS of Explosives with Reduced Elution Temperatures.

Hyperfast Flow-Field Thermal Gradient GC/MS of Explosives with Reduced Elution Temperatures.
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降低洗脱温度的炸药超快流场热梯度 GC/MS

DOI:
10.1021/acs.analchem.8b00900
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发表时间:
2018
影响因子:
7.4
通讯作者:
Boeker
Boeker
中科院分区:
化学1区
文献类型:
--
作者:
Leppert;Härtel;Martin;Klapötke;Thomas M;Boeker

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超快GC/MS的测量时间小于60秒已被用于测量炸药。新的流场热梯度气相色谱(FF-TG-GC)利用了在较低温度下炸药的改进传输过程。结合梯度的聚焦效应,即使在很短的时间间隔内也能获得高分辨率的色谱图。通过模拟分析物通过色谱柱的迁移,证明了通过沿色谱柱沿着施加热梯度降低洗脱温度。模拟显示了一个有趣的效果之间的差异的最高温度和洗脱温度的分析物在其分离的空间梯度。结果表明,无论是从建模的角度来看,梯度洗脱的好处,并通过测量爆炸物的低检测限(LOD)的范围从0.1至20 μg/mL(0.5至150 pg的分析物质量柱)。将结果与作为参考方法的最新真空出口GC/MS进行比较。对于热不稳定的硝酸酯炸药(EGDN、NG、ETN和PETN),发现洗脱温度的降低与较低的LOD之间存在相关性,而对于更稳定的炸药(如DNT和TNT),发现降低的洗脱温度对LOD没有显著影响。
Hyperfast GC/MS below 60 s of measurement time has been used for the measurement of explosives. The new flow-field thermal gradient GC (FF-TG-GC) utilizes a modified transport process of the explosives at lowered temperatures. In combination with the focusing effect of the gradient, high-resolution chromatograms are obtained even in very short time intervals. The reduction of the elution temperature by applying a thermal gradient along the chromatographic column is demonstrated by the simulation of the migration of analytes through the column. The simulation shows an interesting effect of the difference between maximum temperature and elution temperature of analytes during their separation with the spatial gradient. The results show the benefit of the gradient elution both from a modeling perspective and by measurements of explosives with low limits of detection (LOD) in the range from 0.1 to 20 μg/mL (0.5 to 150 pg of analyte mass on column). Results were compared to state-of-the-art vacuum outlet GC/MS as a reference method. A correlation between the reduction of elution temperatures and lower LODs are found for thermal labile nitrate ester explosives (EGDN, NG, ETN, and PETN), while no significant influence of the reduced elution temperature on LODs of more stable explosives, like DNT and TNT, was found.
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