Time-of-flight mass spectrometric analysis of high-molecular-weight alkanes in crude oil by silver nitrate chemical ionization after laser desorption
Time-of-flight mass spectrometric analysis of high-molecular-weight alkanes in crude oil by silver nitrate chemical ionization after laser desorption
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DOI：
10.1021/ac0009797
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发表时间：
2001-03-01
影响因子：
7.4
通讯作者：
Harayama, S
中科院分区：
文献类型：
--
作者：
Dutta, TK;Harayama, S
首次使用飞行时间质谱分析原油中的碳氢化合物。通过硝酸银的激光解吸对原油样品饱和馏分中的烷烃进行化学电离，并以低于 7 ppm 的质量精度解析附着银的 C-24-C-60 烷烃。该技术用于评估海水中的石油降解微生物对脂肪烃和环烷烃的生物降解作用。结果表明，脂肪烃的降解率在 60-80% 范围内，而单环烷烃、二环烷烃、三环烷烃、四环烷烃和五环烷烃的降解率分别在 40-55%、20-30%、10-16%、5-9% 和 15% 范围内。其高灵敏度和应用速度使得激光解吸银化学电离飞行时间质谱分析成为测定各种石油产品中高分子量碳氢化合物的首选方法。
Time-of-flight mass spectrometry was used for the first time to analyze the hydrocarbons in crude oil. Alkanes in the saturated fraction of a;crude oil sample were chemically ionized by the laser desorption of silver nitrate, and the silver-attached C-24-C-60 alkanes were resolved with mass accuracy below 7 ppm. This technique was used to evaluate the biodegradation of aliphatic hydrocarbons and cycloalkanes by oil-degrading microorganisms resident in seawater. It is shown that the aliphatic hydrocarbons were degraded in the range of 60-80%, while the mona-, di-, tri-, tetra-, and pentacycloalkanes were degraded in the range of 40-55, 20-30, 10-16, 5-9, and 15%, respectively. Its high sensitivity and speed of application could result in an analysis by laser desorption silver chemical ionization time-of-flight mass spectrometry being the method of choice for determining high-molecular-weight hydrocarbons in various petroleum products.