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《Environmental Chemistry》 1996-03
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LOSS OF ORGANIC COMPOUNDS IN PRECONCENTRATION OF AIR SAMPLE

He Dasen Li Sijiao Zhao Leihong Wang Yanwu(Department of Chemistry, Zhejiang Normal University, Jinhua 321004)  
The recoveries measured in this study show that the losses of hydrophobic organic compounds (HBOC)on drying column fitted with alkaline,asbestos or K2CO3 were about 25% and 15% respectively, and hydrophilic ethyl alcohol up to about 60%. The breakthrough volumes evaluated by elution gas chromatography demonstrate the possibility that, under certain conditions (certain amount of dryer, temperature, flux of air sample etc. ), both alkaline asbestos and K2CO3 will remain more than 95% of moisture but less than 5% of HBOC from ambient air samples. The results of relative weight sensitivity factor (fw) for FID indicate that the losses of organic compounds in a cryogenic precon centration system using liquid argon ( -180℃ ) as cooler can be neglected. However, the values of fw for another system in which a FEP teflon tubing cooled with dry-ice to - 30℃ was used as the water trap and was placed before the preconcentration U-trap show that a quantity of organic compounds were trapped. The losses can be compensated if the calibration was conducted by injection of standards in the position before the water-trap tubing. The method for preparation of standards with low concentration were also discussed.
【Fund】: 浙江省分析测试基金
【CateGory Index】: X502
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