Transient Method for Determining Indoor Chemical Concentrations Based on SPME: Model Development and Calibration

Area of Science:

• Analytical Chemistry
• Environmental Science

Background:

• Solid-phase microextraction (SPME) is a widely used sampling technique known for its efficiency.
• The influence of convection and diffusion on SPME sampling has been understudied.
• Accurate quantification of chemical concentrations is crucial in environmental monitoring.

Purpose of the Study:

• To develop an analytical model for SPME that incorporates surface mass transfer.
• To enable convenient calculation of chemical concentrations in sample matrices.
• To facilitate the determination of characteristic parameters for SPME calibration.

Main Methods:

• Derivation of an analytical model for SPME considering surface mass transfer.
• Experimental validation using semivolatile organic compounds (SVOCs) like DBP and DEHP.
• Further validation with literature data for volatile organic compounds (VOCs).

Main Results:

• The developed model effectively characterizes SPME sampling for both SVOCs and VOCs.
• The model allows for convenient calculation of chemical concentrations.
• Experimental results demonstrate the model's effectiveness in determining partition and diffusion coefficients.

Conclusions:

• The new analytical model provides a robust method for SPME quantification.
• This approach enhances the accuracy of chemical analysis in various matrices.
• The study offers a valuable tool for rapid chemical concentration determination using SPME.