scholarly journals Nature of unresolved complex mixture in size-distributed emissions from residential wood combustion as measured by thermal desorption-gas chromatography-mass spectrometry

2004 ◽  
Vol 109 (D16) ◽  
Author(s):  
Michael D. Hays
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Thermal Desorption ◽  
Complex Mixture ◽  
Gas Chromatography Mass Spectrometry ◽  
Wood Combustion ◽  
Unresolved Complex Mixture ◽  
Chromatography Mass Spectrometry

scholarly journals Evaluating Phthalate Contaminant Migration Using Thermal Desorption–Gas Chromatography–Mass Spectrometry (TD–GC–MS)

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 683 ◽  
Author(s):  
Yukihiro Ouchi ◽  
Hiroyuki Yanagisawa ◽  
Shigehiko Fujimaki
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Thermal Desorption ◽  
Gas Chromatography Mass Spectrometry ◽  
Approximation Model ◽  
Contaminant Migration ◽  
Short Term ◽  
Small Organic Molecules ◽  
Chromatography Mass Spectrometry ◽  
Ethylhexyl Phthalate

This study describes a methodology for evaluating regulatory levels of phthalate contamination. By collecting experimental data on short-term phthalate migration using thermal desorption–gas chromatography–mass spectrometry (TD–GC–MS), the migration of di(2-ethylhexyl) phthalate (DEHP) from polyvinyl chloride (PVC) to polyethylene (PE) was found to be expressed by the Fickian approximation model, which was originally proposed for solid (PVC)/liquid (solvent) migration of phthalates. Consequently, good data correlation was obtained using the Fickian approximation model with a diffusion coefficient of 4.2 × 10−12 cm2/s for solid (PVC)/ solid (PE) migration of DEHP at 25 °C. Results showed that temporary contact with plasticized polymers under a normal, foreseeable condition may not pose an immediate risk of being contaminated by phthalates at regulatory levels. However, as phthalates are small organic molecules designed to be dispersed in a variety of polymers as plasticizers at a high compounding ratio, the risk of migration-related contamination can be high in comparison with other additives, especially under high temperatures. With these considerations in mind, the methodology for examining regulatory levels of phthalate contamination using TD–GC–MS has been successfully demonstrated from the viewpoint of its applicability to solid (PVC)/solid (PE) migration of phthalates.

Sign in / Sign up

Export Citation Format

Share Document