A method for measuring material semi-volatile organic compound characteristic parameters and adsorption constant

Abstract

The invention belongs to the technical field of indoor environment inspection, and the name of the invention is a method for determining characteristic parameters and adsorption constants of semi-volatile organic compounds in materials, which can simultaneously measure the characteristic parameters of SVOC emission and wall surface adsorption constants of semi-volatile organic compounds in materials. The realization method includes establishing a physical model of SVOC release; placing the material to be tested in the environmental chamber, and introducing pure air at a constant ventilation rate; collecting the SVOC gas in the environmental chamber at different times with a Turners tube, and desorbing it with heat ‑Gas chromatography / mass spectrometer TD‑GC / MS for quantitative analysis; the hourly concentration C of the obtained SVOC a (t) Combined with the physical model, the particle swarm coupled ant colony optimization algorithm is used for nonlinear fitting, and the SVOC release characteristic parameter C can be obtained 0 , D m , K ma and the wall adsorption constant K sa . The method has simple experimental equipment and operation, low cost, simple solution process and higher precision, overcomes the limitation that the existing experimental method can only measure two release characteristic parameters at the same time, and can be used for laboratory testing and engineering applications.

Description

[0001] Technical field [0002] The invention belongs to the technical field of indoor environment inspection, and can realize the simultaneous measurement of semi-volatile organic compound release characteristic parameters and wall surface adsorption constants in materials Background technique [0003] Indoor air pollution caused by semi-volatile organic compounds (SVOCs) has attracted widespread attention, and its main sources are plasticizers and flame retardants added to indoor materials and articles. SVOC generally does not chemically react with materials, so it will gradually transfer to indoor air, dust and various media surfaces over time, and have a negative impact on the human body. SVOC has the physical properties of high boiling point and low saturated vapor pressure, making it easy to be adsorbed by indoor suspended particles, various surfaces and the surface of human skin. When people are exposed to an environment containing SVOC for a long time, SVOC will enter...

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Problems solved by technology

For SVOC wall adsorption constant K sa The adsorption experiment needs to be carried out separately, which is obtained by measuring the concentration of the adsorption phase and the concentration of the gas phase, and the process is very cumbersome.

In addition, there is currently no effective determination of the initial concentration of SVOC C 0 Methods

In summary, the existing methods for measuring SVOC release characteristic parameters and wall surface adsorption constants generally have the defects of large measurement errors, long measurement periods, and complex systems, and these parameters cannot be measured at the same time, which leads to great restrictions on the promotion and application of these methods limit

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