Monoterpene emissions and carbonyl compound air concentrations during the blooming period of rape ( Brassica napus)

An increasing percentage of agricultural land in Germany is used for oil seed plants. Hence, rape has become an important agricultural plant (in Saxony 1998: 12% of the farmland) in the recent years. During flowering of rape along with intensive radiation and high temperatures, a higher production a...

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Veröffentlicht in:Chemosphere (Oxford) 2002-12, Vol.49 (10), p.1247-1256
Hauptverfasser: Müller, Konrad, Pelzing, Matthias, Gnauk, Thomas, Kappe, Anett, Teichmann, Ulrich, Spindler, Gerald, Haferkorn, Sylvia, Jahn, Yvonne, Herrmann, Hartmut
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container_end_page 1256
container_issue 10
container_start_page 1247
container_title Chemosphere (Oxford)
container_volume 49
creator Müller, Konrad
Pelzing, Matthias
Gnauk, Thomas
Kappe, Anett
Teichmann, Ulrich
Spindler, Gerald
Haferkorn, Sylvia
Jahn, Yvonne
Herrmann, Hartmut
description An increasing percentage of agricultural land in Germany is used for oil seed plants. Hence, rape has become an important agricultural plant (in Saxony 1998: 12% of the farmland) in the recent years. During flowering of rape along with intensive radiation and high temperatures, a higher production and emission of biogenic VOC was observed. The emissions of terpenes were determined and more importantly, high concentrations of organic carbonyl compounds were observed during this field experiment. All measurements of interest have been carried out during two selected days with optimal weather conditions. It is found that the origin or the mechanism of formation of different group of compounds had strong influence on the day to day variation of their concentrations. The emission flux of terpenes from flowering rape plants was determined to be 16–32 μg h −1 m −2 (30–60 ng h −1 per g dry plant––540–1080 ng h −1 per plant), in total. Limonene, α-thujene and sabinene were the most important compounds (about 60% of total terpenes). For limonene and sabinene reference emission rates ( M S) and temperature coefficients were determined: β limonene=0.108 K −1 and M S=14.57 μg h −1 m −2; β sabinene=0.095 K −1 and M S=5.39 μg h −1 m −2. The detected carbonyl compound concentrations were unexpectedly high (maximum formaldehyde concentration was 18.1 ppbv and 3.4 ppbv for butyraldehyde) for an open field. Possible reasons for these concentrations are the combination of primary emission from the plants induced by high temperature and high ozone stress, the secondary formation from biogenically and advected anthropogenically emitted VOC at high radiation intensities and furthered by the low wind speeds at this time.
doi_str_mv 10.1016/S0045-6535(02)00610-0
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source MEDLINE; Elsevier ScienceDirect Journals
subjects Aldehyde mixing ratios
Applied sciences
Atmospheric pollution
Brassica
Chromatography, High Pressure Liquid
Disinfectants - analysis
Dispersed sources and other
Environmental Monitoring
Exact sciences and technology
Flowers - chemistry
Formaldehyde - analysis
GC–MS
Hot Temperature
HPLC
Monoterpene emission flow rates
Monoterpenes - analysis
Pollution
Pollution sources. Measurement results
Seasons
Sunlight
Volatilization
Wind
title Monoterpene emissions and carbonyl compound air concentrations during the blooming period of rape ( Brassica napus)
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