An inexpensive autosampler to maximize throughput for an ion source that samples surfaces in open air

被引：17

作者：

Grange, Andrew H. ^{[1
]}

机构：

[1] US EPA, Off Res & Dev, Natl Res Lab, Div Environm Sci, Las Vegas, NV 89193 USA

来源：

ENVIRONMENTAL FORENSICS | 2008年 / 9卷 / 2-3期

关键词：

homeland security; autosampler; DART; throughput; time-of-flight mass spectrometer;

D O I：

10.1080/15275920802115860

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Rapid analysis of hundreds of wipe samples after a chemical dispersion event is essential for quickly characterizing the hazard posed to the public. An autosampler was built to pull 76 cotton swabs mounted along a 91-cm (3-foot) long, square aluminum rod in open air, through the ionizing beam of a direct analysis in real time (DART(1)) ion source interfaced to a time-of-flight mass spectrometer. The rod and swabs mounted on N-scale model railroad flat cars were pulled through the ion source in 7.5 min by a 7-rpm motor. Percent relative standard deviations (%RSDs) of 18.5% to 21.3% were obtained for the chromatographic peak areas of the protonated molecule. Maximum-to-minimum ratios of the areas were between 2.22 and 2.71. Measured exact masses of analyte ions were always accurate to within 1 mDa.

引用

页码：127 / 136

页数：10

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