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Determination of deposition rates of organic nitrate compounds to soil and plant leaves using the dynamic chamber method.

Grant number: 18/18831-0
Support type:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): November 01, 2018
Effective date (End): August 31, 2019
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Analytical Chemistry
Principal researcher:Arnaldo Alves Cardoso
Grantee:Carolina Gomes da Rocha
Supervisor abroad: Hartwig Harder
Home Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
Research place: Max Planck Society, Mainz, Germany  
Associated to the scholarship:16/05706-7 - Sugarcane crop as emission source of reactive nitrogen compounds and its role in the environment, BP.DR

Abstract

Organic nitrates, including peroxy nitrates (RO2NO2) and alkyl nitrates (RONO2), are formed in the atmosphere by the reaction of NOx with oxidation products of volatile organic compounds (VOCs). They comprise up to 20% of all oxidized forms of nitrogen (NOz) and, once formed, can be transported by the winds, undergo chemistry, be incorporated into aerosol or be deposited to the Earth's surface. Deposition rates and foliar uptake of inorganic nitrogen (NO2, NH3), and more recently, nitrous acid (HONO) and peroxyacetyl nitrate (PAN) to soil and plants has been reported. However, so far, information is lacking regarding deposition of organic nitrates. The deposition through foliar uptake of atmospheric nitrogen compounds by plants could represent a major contribution of global atmospheric inputs of nitrogen into the ecosystems, once it consists in a direct addition of nitrogen to plant metabolism and could potentially more readily influence plant growth compared to soil deposited nitrogen. In this way, this project proposes to investigate the deposition and foliar uptake of organic nitrates compounds to different types of soil and plants, using a dynamic chamber method, under controlled environment conditions. The chambers were developed at the Max-Planck Institute for Chemistry and their performance was described in previous works of the Institute. This work is essential to i. improve the understanding about the impact of agriculture on air quality (ozone formation influence and N gases losses) ii. determining atmospheric radical budgets; iii. estimate the nitrogen input in remote environments; iv. improving regional and global models of transport v. contributing to more effective strategies for improving air quality.

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