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将柴油机排气微粒分为有机组份和干组份的３种方法，即热解质量分析法（ＴＧ）、索氏萃取法（ＳＥ）和真空挥发法（ＶＶ）作了对比研究。结果表明，ＴＧ需要复杂昂贵的设备，而且效率较低。ＳＥ只适用于稳定性较好的采样滤纸，如涂敷聚四氟乙烯的滤纸，而且一次只能处理少量样品。ＶＶ对采样滤纸要求不高，一次处理样品量多达十几，甚至几十个。用ＳＥ和ＶＶ得出的结果基本一致。ＶＶ可作为一种实用方法加以推荐。
Three methods for separating diesel engine exhaust particulates into organic components and dry components were compared by pyrolysis mass spectrometry (TG), Soxhlet extraction (SE) and vacuum evaporation (VV). The results show that TG requires complex and expensive equipment and is less efficient. SE is only suitable for better stability of sampling filter paper, such as Teflon coated filter paper, and can only handle a small amount of samples at a time. VV less demanding on the sample filter paper, a sample of up to a dozen or even dozens of samples. The results obtained with SE and VV are basically the same. VV can be recommended as a practical method.