10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Soil Spreading of Organic Waste Products: Source of Secondary Oorganic Aerosols
RALUCA CIURARU, Corentin Berger, Pauline Buysse, Yvain Carpentier, Céline Decuq, Cristian Focsa, Sophie Genermont, Sylvie Gosselin, Sabine Houot, Julien Kammer, Florence Lafouge, Benjamin Loubet, Nicolas Visez, Denis Petitprez, INRA
Abstract Number: 1162 Working Group: Aerosol Chemistry
Abstract The agricultural soils emit volatile organic compounds (VOCs) that contribute to the formation of secondary pollutants such as ozone or secondary organic aerosols (SOA).
Soil VOC emissions are lower than the VOCs released from the canopy. Nevertheless, it has been showed that under certain conditions (i.e., temperature, soil water content…) and for specific ecosystems, VOC emissions from soil could reach the same order of magnitude as canopy emissions (Peñuelas et al., 2014). Data on VOC released from agricultural soils are relatively scarce although they are recognized as large contributors of methanol and acetone to the atmosphere (Bachy et al., 2018).
Organic waste products (OWPs) are used in agriculture as organic amendments to improve soil fertility. The valorization of different types of OWPs from farms (bovine manure, pig slurry...), urban origin (sewage sludge, green waste) or industrial origin (sweets, etc.) is currently promoted as a substitute for mineral fertilizers. OWPs have a wide variety of characteristics due to their origin and the treatments that they may undergo before spreading and this diversity of characteristics could have a significant impact on gaseous and particulate emissions following soil application. There are few studies quantifying the concentrations and emission rates of gaseous compounds emitted from organic waste products, and those studies primarily address their odorant properties in order to identify suitable odor abatement techniques (Feilberg et al., 2015). Some of these laboratory studies have quantified the VOCs emissions from OWPs, including non-methane hydrocarbons VOCs, sulfur compounds, nitrogen compounds and oxygenated volatile organic compounds (Feilberg et al., 2015). Chemical transformations of these atmospheric organic compounds can further lead to products of lower volatility that subsequently partition into the condensed phase.
The aim of this study is to investigate VOC emissions, their subsequent reaction with ozone and SOA formation from agricultural soil amended with different OWPs. The experiments are currently performed in an atmospheric chamber coupled to an aerosol flow tube. A high panel of scientific equipment allows the physical and chemical characterization of the VOCs and freshly formed aerosols (proton transfer mass spectrometer, scanning mobility particle sizer…). Aerosol sampling on filters allows their chemical and molecular characterization by off-line analysis (gas chromatography, time of flight secondary ions mass spectrometry, laser desorption/ionization time of flight mass spectrometry).
[1] Peñuelas, J.,et al., 2014, Plant Cell Environ. 37, 1866–1891. [2] Bachy, A. et al., 2018, Environ. 176, 229–239. [3] Feilberg A. et al., 2015, Sensors 15, 1148-1167.