High-Throughput Trace Analysis of Explosives in Water by Laser Diode Thermal Desorption/Atmospheric Pressure Chemical Ionization-Tandem Mass Spectrometry

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• 作者：Koffi Badjagbo ; S茅bastien Sauv茅
• 刊名：Analytical Chemistry
• 出版年：2012
• 出版时间：July 3, 2012
• 年：2012
• 卷：84
• 期：13
• 页码：5731-5736
• 全文大小：280K
• 年卷期：v.84,no.13(July 3, 2012)
• ISSN：1520-6882

文摘

Harmful explosives can accumulate in natural waters in the long term during their testing, usage, storage, and dumping and can pose a health risk to humans and the environment. For the first time, attachment of small anions to neutral molecules in laser diode thermal desorption/atmospheric pressure chemical ionization was systematically investigated for the direct determination of trace nitroaromatics, nitrate esters, and nitramine explosives in water. Using ammonium chloride as an additive improved the instrument response for all the explosives tested and promoted the formation of several characteristic adduct ions. The method performs well achieving good linearity over at least 2 orders of magnitude, with coefficients of determination greater than 0.995. The resulting limits of detection are in the range of 0.009鈥?.092 渭g/L. River water samples were successfully analyzed by the proposed method with accuracy in the range of 96鈥?8% and a response time of 15 s, without any further pretreatment or chromatographic separation.