Details for A two-column method for long-term monitoring of non-methanehydrocarbons (NMHCs) and oxygenated volat

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Name:A two-column method for long-term monitoring of non-methanehydrocarbons (NMHCs) and oxygenated volat
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Hopkins, J. R., Read, K. A., and Lewis, A. C.: A Two Column Method for Long-term Monitoring of Non-Methane Hydrocarbons (NMHCs) and Oxygenated Volatile Organic Compounds, J. Envir. Mon., 5, 8–13, 2003.


Abstract


 

A method has been developed for concurrent analysis of C2–C7 hydrocarbons and C2–C5 oxygenated volatile organic compounds (o-VOCs) including alcohols, aldehydes, ketones and ethers. A multi-bed, Peltier-cooled adsorbent trap, consisting of Carboxen 1000 and Carbopack B, was used to acquire one sample per hour. Upon injection the sample was split in an approximately 50 : 50 ratio between a 50 m aluminium oxide (Al2O3) porous layer open tubular (PLOT) column and a 10 m LOWOX column. Eluents from each column were then analysed using flame ionisation detection (FID). Regular calibration of the system was performed using a standard cylinder mixture at the parts per billion by volume (ppbV) level for non-methane hydrocarbons (NMHCs) and a permeation tube method for the oxygenated species. The system is fully automated with NMHC detection limits between 1 and 10 parts per trillion by volume (pptV) and o-VOC detection limits between 10 and 40 pptV.

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