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与传统采样技术相比,固相微萃取法(SPME)作为一种非破坏性的采样方法具有萃取体积小、萃取时间短的优点,自问世以来便被广泛应用。SPME的萃取特性受涂层表面污染物对流效应的影响,但以往研究却少有提及。通过引入对流传质系数,本文推导了运用SPME对VOC和SVOC浓度进行萃取分析的解析模型。利用该模型,可得到被萃取样品中的VOC和SVOC浓度。此外,模型还可用于测定SPME采样的关键参数——分配系数和扩散系数(称为标定过程)。实验中对一种典型的SVOC(邻苯二甲酸二异辛酯)进行了SPME萃取。分析表明,模型预测值和实验数据能够很好地吻合,从而证明了模型和标定方法的有效性。
Compared with traditional sampling techniques, solid phase microextraction (SPME), as a non-destructive sampling method, has the advantages of small extraction volume and short extraction time, and has been widely used since its publication. The extraction characteristics of SPME are affected by the convective effect of pollutants on the coating surface, but few studies have been mentioned in the past. By introducing convective mass transfer coefficients, an analytical model for the extraction and analysis of VOC and SVOC concentrations using SPME is derived. Using this model, the concentration of VOC and SVOC in the extracted sample can be obtained. In addition, the model can be used to determine the key parameters of SPME sampling - the partition coefficient and diffusion coefficient (called the calibration process). In the experiment, a typical SVOC (diisooctyl phthalate) was subjected to SPME extraction. The analysis shows that the model predictions and experimental data are in good agreement, which proves the validity of the model and calibration methods.