Proton-Transfer Chemical-Ionization Mass Spectrometry Allows Real-Time Analysis of Volatile Organic Compounds Released from Cutting and Drying of Crops

Autor:	Ray Fall, B. M. Baker, J. A. de Gouw, T. Custer, Carleton J. Howard
Rok vydání:	2000
Předmět:	chemistry.chemical_classification Chemical ionization Butanone Acetaldehyde food and beverages General Chemistry Mass spectrometry chemistry.chemical_compound chemistry Environmental chemistry Botany Acetone Environmental Chemistry Volatile organic compound Methanol Chemical composition
Zdroj:	Environmental Science & Technology. 34:2640-2648
ISSN:	1520-5851 0013-936X
DOI:	10.1021/es991219k
Popis:	The wounding and drying of plant material during crop harvest could be a significant source of volatile organic compounds (VOCs) that enter the atmosphere. Here, we show that these primarily oxygenated VOCs can be measured using proton-transfer chemical-ionization mass spectrometry (PT-CIMS), a method that allows online and simultaneous monitoring of oxygenated VOC levels. For clover, alfalfa, and corn, leaf wounding and in particular drying were shown to lead to strongly enhanced emissions of a series of C6 aldehydes, alcohols, and esters derived from (Z)-3-hexenal. Additionally, for the forage crops clover and alfalfa, enhanced emissions of methanol, acetaldehyde, acetone, and butanone were observed. The identities of the measured carbonyl compounds were confirmed using high-pressure liquid chromatography. For clover, initial cutting led to a VOC release of about 175 μg of C (g dry wt)-1, while during drying the cut clover released >1000 μg of C (g dry wt)-1; qualitatively, similar amounts of VOCs were ...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a0579a5f0f98b019c3023328a2b001b0 https://doi.org/10.1021/es991219k Zobrazit plný text záznamu