| Title: | A cryogen-free refrigerating preconcentration device for the measurement of C2 to C4 hydrocarbons in ambient air |
| Author(s): | Peng H; Wang J; Shen Z; Wu D; Guan Y; |
| Address: | "Department of Instrumentation & Analytical Chemistry, Key Lab of Separation Science for Analytical Chemistry of CAS, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China" |
| ISSN/ISBN: | 1364-5528 (Electronic) 0003-2654 (Linking) |
| Abstract: | "A cryogen-free refrigerating preconcentration device for the enrichment of trace amounts of highly volatile organic compounds in the atmosphere prior to analysis has been designed and evaluated. The device consists of a microtrap housed in an insulated box, which is cooled by a conventional refrigeration unit. Experimental parameters, including adsorbent mass, trapping temperature, and thermal desorption temperature, were optimized. The on-line coupling of the device to a GC allows sufficient enrichment and separation of C2 to C4 hydrocarbons in less than 40 min without a second cryotrap. The target compounds analysis showed good linearity (correlation coefficients >0.99) and repeatability (relative standard deviation <5%). Detection limits for the 10 volatile organic compounds ranged from 14 ppt to 52 ppt, under the conditions of a 500 mL sampling volume and -10 degrees C trapping temperature. Real air sample measurements were conducted at an urban site, and five VOCs including ethane, ethene, propane, propene and 1-butene were detected and quantified" |
| Notes: | "PubMed-not-MEDLINEPeng, Hong Wang, Jianwei Shen, Zheng Wu, Dapeng Guan, Yafeng eng England 2010/11/16 Analyst. 2011 Feb 7; 136(3):586-90. doi: 10.1039/c0an00563k. Epub 2010 Nov 15" |
