The Adsorption Property Research Of Etched Metal Fibers As Spme Material To VOCs

Air pollution is becoming more and more serious,which has threatened the healthy life of human beings.Among air pollutants,volatile organic pollutants(VOCs)are low in content but harmful,so we need to monitor and control them effectively.The analysis and determination of volatile organic compounds in air generally belong to trace analysis,which requires necessary pretreatment of samples.In this paper,the common pretreatment and analysis methods for the analysis and detection of benzene homologues are reviewed.The solid phase microextraction method and its application,as well as the design idea of this experiment are introduced.The main work of this experiment is as follows.1.A three-way quartz glass extraction chamber was designed to ensure that gas samples passed radially around the SPME fiber.A dynamic adsorption gas path device was built based on the radial extraction chamber.Two etched stainless steel fibers with unique microstructures(lattice microporous and scaly)were prepared by anodic oxidation combined with HF chemical etching,and characterized by scanning electron microscopy.Two kinds of etched stainless steel metal fibers were used as solid phase microextraction fibers to establish SPME-GC analysis methods based on the design of radial extraction chamber.Microporous fibers were used for the extraction and analysis of benzene and toluene in the air.The linear correlation coefficient of this method was greater than 0.99,the detection limit is 0.015~0.050?g/m~3,and the precision is6.8~8.9%.The method was applied to the actual sample detection,and the recoveries were 82~88%.Scaly fibers were used for the extraction and analysis of benzene and toluene in the air.The linear correlation coefficient of this method was above 0.99,the limits of detection was 0.005~0.030?g/m~3,and the precision is 5.4~9.1%.The method was applied to the actual sample detection,and the recoveries were 82~94%.2.A three-way quartz glass extraction chamber was designed to ensure that gas samples passed along the axis of SPME fibers.A dynamic adsorption gas path device was built based on the axial extraction chamber.Two etched stainless steel fibers with unique microstructures(lattice microporous and scaly)were prepared by anodic oxidation combined with HF chemical etching.BET characterization of microporous fibers was performed.Two kinds of etched stainless steel metal fibers were used as solid phase microextraction fibers to establish SPME-GC analysis methods based on the designed axial extraction chamber.Microporous fibers were used for the extraction and analysis of benzene and toluene in the air.The linear correlation coefficient of this method was above 0.99,the detection limit is 0.015~0.08?g/m~3,and the precision is7.7~9.3%.The method was applied to the actual sample detection,and the recoveries were 84~92%.Scaly fibers were used to extract benzene and toluene from air.The linear correlation coefficient was above 0.99,the limits detection is 0.001~0.05?g/m~3,and the precision is 3.4~8.3%.The method was applied to the actual sample detection,and the recoveries were 83~92%.