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000013462 084__ $$2WoS$$aEnvironmental Sciences
000013462 084__ $$2WoS$$aMeteorology & Atmospheric Sciences
000013462 1001_ $$0P:(DE-Juel1)VDB799$$aKomenda, M.$$b0$$uFZJ
000013462 245__ $$aMeasurements of biogenic VOC emissions : sampling, analysis and calibration
000013462 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2001
000013462 300__ $$a2069 - 2080
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000013462 440_0 $$0697$$aAtmospheric Environment$$v35$$x1352-2310
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000013462 520__ $$aWe describe an experimental sq stem and techniques for sampling and analyzing biogenic emissions of volatile organic compounds (VOC). The system uses a Teflon chamber to enclose a single branch of a tree. Temperature, photosynthetic active radiation (PAR), relative humidity and carbon dioxide concentration are continuously monitored with a time resolution of five minutes. VOCs are sampled on tubes containing solid adsorbents (Tenax TA and Carbotrap) with a time resolution of 1 h. Composition and concentration of VOC emissions are measured with a gas chromatographic system equipped with a flame ionization detector (FID) for quantitative and a mass spectrometer (MS) for qualitative analysis. To calibrate the system, a diffusion source was built to produce standard mixtures of up to 36 different compounds with mixing ratios at low concentrations and high accuracy. The diffusion rates were monitored over 17 months and shelved variations between 0.2 and 7.6% for monoterpenes (expect for alpha -phellandrene, alpha -terpinene and gamma -terpinene) and between 10.6 and 22.6% for sesquiterpenes. FID response factors calculated from calibration measurements were corrected using correction factors based on the effective carbon number concept. The individual response factors of 23 compounds were combined to a mean response factor (RFm) with a value of 23,100 muV s ng(-1) and a standard deviation of 9%. The system described here was used to measure VOC emission rates of Scots pine (Pinus sylvestris) in 1998 and 1999. (C) 2001 Elsevier Science Ltd. All rights reserved.
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000013462 65320 $$2Author$$amonoterpenes
000013462 65320 $$2Author$$aenclosure chamber
000013462 65320 $$2Author$$adiffusion device
000013462 7001_ $$0P:(DE-Juel1)VDB1216$$aParusel, E.$$b1$$uFZJ
000013462 7001_ $$0P:(DE-Juel1)VDB1751$$aWedel, A.$$b2$$uFZJ
000013462 7001_ $$0P:(DE-Juel1)VDB810$$aKoppmann, R.$$b3$$uFZJ
000013462 773__ $$0PERI:(DE-600)1499889-0$$a10.1016/S1352-2310(00)00502-1$$gVol. 35, p. 2069 - 2080$$p2069 - 2080$$q35<2069 - 2080$$tAtmospheric environment$$v35$$x1352-2310$$y2001
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000013462 9141_ $$y2001
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