title: Transient Method for Determining Indoor Chemical Concentrations Based on SPME: Model Development and Calibration.
abstract: Solid-phase microextraction (SPME) is regarded as a nonexhaustive sampling technique with a smaller extraction volume and a shorter extraction time than traditional sampling techniques and is hence widely used. The SPME sampling process is affected by the convection or diffusion effect along the coating surface, but this factor has seldom been studied. This paper derives an analytical model to characterize SPME sampling for semivolatile organic compounds (SVOCs) as well as for volatile organic compounds (VOCs) by considering the surface mass transfer process. Using this model, the chemical concentrations in a sample matrix can be conveniently calculated. In addition, the model can be used to determine the characteristic parameters (partition coefficient and diffusion coefficient) for typical SPME chemical samplings (SPME calibration). Experiments using SPME samplings of two typical SVOCs, dibutyl phthalate (DBP) in sealed chamber and di(2-ethylhexyl) phthalate (DEHP) in ventilated chamber, were performed to measure the two characteristic parameters. The experimental results demonstrated the effectiveness of the model and calibration method. Experimental data from the literature (VOCs sampled by SPME) were used to further validate the model. This study should prove useful for relatively rapid quantification of concentrations of different chemicals in various circumstances with SPME.
authors.affiliation: Department of Building Science, Tsinghua University , Beijing 100084, China.|Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, Beijing 100084, China.
authors.forename: Jianping
authors.initials: J
authors.lastname: Cao
authors.affiliation: School of Mechanical Engineering, Beijing Institute of Technology , Beijing 100081, China.
authors.forename: Jianyin
authors.initials: J
authors.lastname: Xiong
authors.affiliation: School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture , Beijing 100044, China.
authors.forename: Lixin
authors.initials: L
authors.lastname: Wang
authors.affiliation: Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin , Austin, Texas 78712-1094, United States.
authors.forename: Ying
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Department of Building Science, Tsinghua University , Beijing 100084, China.|Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, Beijing 100084, China.
authors.forename: Yinping
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D002138:Calibration; D003993:Dibutyl Phthalate; D004058:Diffusion; D052617:Solid Phase Microextraction; D055549:Volatile Organic Compounds
chemical_list: D055549:Volatile Organic Compounds; D003993:Dibutyl Phthalate