Triple-quadrupole mass spectrometry studies of nitroaromatic emissions from different diesel engines.
Triple-quadrupole mass spectrometry studies of nitroaromatic emissions from different diesel engines.
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不同柴油发动机硝基芳烃排放的三重四极杆质谱研究。
DOI：
10.1021/es00114a002
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发表时间：
1983
影响因子：
11.4
通讯作者：
A. Li
中科院分区：
文献类型：
--
作者：
T. Henderson;J. D. Sun;R. Royer;T. M. Harvey;D. Hunt;J. Fulford;A. Lovette;W. Davidson;C. Clark;A. Li
采用三重四极杆质谱仪(MS/MS)对直喷式单缸柴油机和间接喷油式V-8柴油机的硝基芳烃排放进行了比较。萃取物中的低含量可能是由于所用参比燃料的低含量所致。在参比燃料中添加Py可使废气中的Py含量增加，但致突变性差异不大。与N02完全反应产生的总致突变性中，只有约1/1000发生在柴油机排气和过滤器上的烟尘收集过程中。用Me2SO进行分级，可有效地将脂肪族化合物从诱变活性中分离出来，并可浓缩用于MS/MS分析的硝基芳香化合物。异丁烷化学电离MS/MS需要一定浓度的硝基芳香族化合物，而常压MS/MS即使在未分离的萃取物中也能检测到硝基芳香族化合物。不同致突变性的浓缩样品的MS/MS比较表明，主要的差异是致突变较多的样品中二硝基化合物的离子强度增加。结果表明，在已发现的柴油烟尘致突变活性中，多硝基化合物可能比单硝基化合物具有更大的致突变活性。
Triple-quadrupole mass spectrometry (MS/MS) has been used to compare nitroaromatic emissions from two different types of diesel engines, a direct-injection, sin-gle-cylinder engine and an indirect-injection V-8 engine. The low level of nitropyrenes/nitrofluoranthenes in ex-haust extracts may be due in part to the low pyrene con-tent of the reference fuel used. Addition of pyrene to reference fuel resulted in increased pyrene in exhaust ex-tracts, but only minordifferences in mutagenicity. Only about 1/1000 of the total mutagenicity from complete reaction with N02 appeared to have occurred during diesel exhaust and soot collection on filters. Fractionation with Me2SO was found to be useful in separating aliphatic hydrocarbons from mutagenic activities and in concen-trating nitroaromatic compounds for MS/MS analysis. Concentration of certain nitroaromatic compounds was necessary for isobutane chemical ionization MS/MS, while atmospheric pressure MS/MS appeared capable of de-tecting nitroaromatic compounds even in unfractionated extracts. MS/MS comparisons of concentrated samples of differing mutagenicities showed the main differences were increased ion intensities of dinitro compounds in more mutagenic samples. It is concluded that the polynitro compounds may be of more significance than mononitro compounds in the mutagenic activities that have been found associated with diesel soot.