Comprehensive two-dimensional gas chromatography coupled to high-resolution time-of-flight mass spectrometry and simultaneous nitrogen phosphorous and mass spectrometric detection for characterization of nanoparticles in roadside atmosphere
Comprehensive two-dimensional gas chromatography coupled to high-resolution time-of-flight mass spectrometry and simultaneous nitrogen phosphorous and mass spectrometric detection for characterization of nanoparticles in roadside atmosphere
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DOI：
10.1016/j.chroma.2007.02.001
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发表时间：
2007-05-25
影响因子：
4.1
通讯作者：
Kobayashi, Shinji
中科院分区：
文献类型：
--
作者：
Ochiai, Nobuo;Ieda, Teruyo;Kobayashi, Shinji
描述了一种在路边大气中表征尺寸分辨颗粒的方法，包括直径为29-58 nm的纳米颗粒部分。该方法基于样品的热解吸(TD)，然后是具有新检测能力的全面二维气相色谱(GC X GC)，包括高分辨率飞行时间质谱仪(HRTOF-MS)以及与氮磷检测器(NPD)和四极杆质谱仪(QMS)同时检测。GC x GC-HRTOF-MS具有更高的选择性，允许使用复杂样品基质中具有0.05 Da宽窗口的质谱仪对选定的化学类别进行基团类型分离，例如含氧多环芳烃(oxy-PAHs)。此外，准确的质量测量提供了候选元素组成以及NIST库搜索结果，以初步鉴定50种化合物。此外，NPD和QMS的同时检测证实了15种含氮化合物的存在。利用TD-GC-X-GC-QMS对几种尺寸分辨的颗粒物中的部分多环芳烃进行了定量分析。该方法对大多数目标多环芳烃具有良好的线性关系(r(2)>；0.988)和较高的灵敏度(定量限：10 pg)。纳米颗粒的单位颗粒物(PM)质量中的多环芳烃浓度明显高于直径为102 nm的大颗粒。(C)2007 Elsevier B.V.保留所有权利。
A method is described for characterization of size-resolved particles including the nanoparticles fraction with a diameter of 29-58 nm in roadside atmosphere. The method is based on thermal desorption (TD) of a sample followed by comprehensive two-dimensional gas chromatography (GC x GC) with novel detection capabilities, including high resolution time-of-flight mass spectrometry (HRTOF-MS) and simultaneous detection with a nitrogen phosphorous detector (NPD) and a quadrupole mass spectrometer (qMS). Increased selectivity with the GC x GC-HRTOF-MS allows a group type separation of a selected chemical class, e.g. oxygenated polycyclic aromatic hydrocarbons (oxy-PAHs), using mass chromatography with a 0.05 Da wide window in the complex sample matrix. Also, exact mass measurements provide candidate elemental compositions as well as NIST library search results for tentative identifications of 50 compounds. Moreover, the simultaneous detection with the NPD and the qMS elucidate the presence of 15 nitrogen-containing compounds. Quantitative analysis of selected PAHs in several size-resolved particles was also performed by use of the TD-GC x GC-qMS with limited scan range. The method showed good linearity (r(2) > 0.988) and high sensitivity (limit of quantification: < 10 pg) for most of the target PAHs. The concentration of PAHs per particulate matter (PM) mass in nanoparticles was considerably higher than those of larger size of particles with a diameter of > 102 nm. (C) 2007 Elsevier B.V. All rights reserved.