Study On GC-MS Determination Method Of Volatile Organic Compounds In Interior Decoration Materials

Indoor air pollution has been listed by the World Health Organization?WHO?as one of the eight major hazards to human health in the world.Due to the diversity of pollutant types and sources,long-term and cumulative effects on the human body,etc.With the development of society,people demand high-grade and high-quality life,and more and more green and environmentally friendly materials are used in interior decoration.These environmentally friendly materials no longer contain or contain lower levels of pollutants specified in national standards,but new pollutants will appear.Therefore,new screening and detection methods for contaminants need to be established.In view of the current actual situation and the problem of poor detection sensitivity and accuracy,this paper develops an automated combined technology that integrates gas adsorption,enrichment,and detection,that is,online static headspace-thermal analysis,headspace solid phase microextraction,headspace bottle sampling solid phase microextraction technology with GC-MS combined technology.Rapid,accurate and sensitive detection methods for VOCs in water-based coatings and wooden floors were established.Chapter 1:This chapter outlines the current status of indoor pollution,sources of indoor pollution,and the harm to human health.The concentration requirements and detection methods of harmful materials in indoor decoration materials and indoor air,and the latest research on detection methods of VOCs in indoor decoration materials and indoor air are introduced.The three headspace analysis methods and their research progress in VOCs detection are introduced in detail.Chapter 2:At present,more and more environmentally friendly decoration materials are emerging on the market,and the content of pollutants has been significantly reduced.In order to improve the detection sensitivity and meet the detection requirements of the trace VOCs.A headspace sampler,thermal desorption and gas chromatography-mass spectrometry were connected to establish an online static headspace-thermal desorption-gas chromatography-mass spectrometry method for the detection of 10 VOCs in water-based paint.In this method,the sample headspace air is repeatedly extracted and transported to the Tenax tube for adsorption and thermal desorption followed by GC/MS analysis.Under optimized experimental conditions,this method has good linear relationship?R² is between0.9979⁰.9992?,good precision?RSD is between 3.1%¹1.2%?as well as low method detection limit(LOD is 12.98²0.80?g L^-1)and good recovery?87¹10%?.A simple,fast and environmentally friendly method for automatic extraction,enrichment and determination of common VOCs in water-based paints.Chapter 3:Using ZIF-7 fiber solid-phase microextraction device combined with headspace extraction,GC/MS detection method to determine 6 kinds of BTEX in wooden floor.Based on the good adsorption effect of ZIFs materials,ZIF-7 and ZIF-8 were successfully prepared by normal temperature and pressure synthesis.They were used as coatings for SPME and the effects of adsorption and desorption of the two coatings were optimized and compared.ZIF-7 has better adsorption effect on selected BTEX than ZIF-8.Therefore,ZIF-7 was selected as the fiber of SPME to determine BTEX in actual samples.Under optimized experimental conditions,this method has good linear relationship?R² is0.9984⁰.9990?,good precision?RSD is between1.9%⁹.8%?as well as low method detection limit(LOD is between 0.62¹.91?g L^-1)and good recovery rate?85¹16%?.The method is simple,fast and sensitive,can be used for the determination of BTEX in wooden floors.Chapter 4:A SPME-CG/MS method based on headspace bottle sampling was developed for the determination of BTEX in renovated indoor air.The 20 mL headspace vial replaced the traditional large volume sampling container measurement method,which facilitates on-site sampling and rapid analysis.Calibration can be performed quickly and easily using standard-added calibration methods,replacing the"zero"air requirement that previously required removal of air and inert gas fill.Extends the use of ZIF-7 fiber,which has a good adsorption effect on BTEX,to adsorb BTEX in the air.The BTEX has good linear relationship?R²>0.99?and better precision?RSD?8.9%?in the concentration range of 20²00?g m^-3.After optimization of experimental conditions and method verification,it was successfully used for the determination of BTEX in indoor air of newly decorated houses.