Gil-Moltó J, Varea M, Galindo N, Crespo J
Laboratorio de Contaminación Atmosférica (LCA), Area de Física Aplicada, Universidad Miguel Hernández, Avenida de la Universidad s/n, 03202 Elche, Spain.
J Chromatogr A. 2009 Feb 27;1216(9):1285-9. doi: 10.1016/j.chroma.2008.12.080. Epub 2008 Dec 30.
The application of the thermal desorption (TD) method coupled with gas chromatography-mass spectrometry (GC-MS) to the analysis of aerosol organics has been the focus of many studies in recent years. This technique overcomes the main drawbacks of the solvent extraction approach such as the use of large amounts of toxic organic solvents and long and laborious extraction processes. In this work, the application of an automatic TD-GC-MS instrument for the determination of particle-bound polycyclic aromatic hydrocarbons (PAHs) is evaluated. This device offers the advantage of allowing the analysis of either gaseous or particulate organics without any modification. Once the thermal desorption conditions for PAH extraction were optimised, the method was verified on NIST standard reference material (SRM) 1649a urban dust, showing good linearity, reproducibility and accuracy for all target PAHs. The method has been applied to PM10 and PM2.5 samples collected on quartz fibre filters with low volume samplers, demonstrating its capability to quantify PAHs when only a small amount of sample is available.
热脱附（TD）法与气相色谱-质谱联用（GC-MS）在气溶胶有机物分析中的应用是近年来许多研究的重点。该技术克服了溶剂萃取法的主要缺点，如使用大量有毒有机溶剂以及冗长繁琐的萃取过程。在本研究中，评估了自动热脱附-气相色谱-质谱仪用于测定颗粒态多环芳烃（PAHs）的应用。该仪器的优点是无需任何改装即可分析气态或颗粒态有机物。一旦优化了PAH萃取的热脱附条件，就在NIST标准参考物质（SRM）1649a城市灰尘上对该方法进行了验证，结果表明所有目标PAHs均具有良好的线性、重现性和准确性。该方法已应用于用低流量采样器采集在石英纤维滤膜上的PM10和PM2.5样品，证明了在仅有少量样品时其对PAHs进行定量分析的能力。
