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Identifier

000351709

Title

Καρβονυλικές ενώσεις στην ατμόσφαιρα της Ανατολικής Μεσογείου

Alternative Title

Carbonyl compounds in the atmosphere of eastern Mediterranean

Author

Μεσαρχάκη, Ευριδίκη Χαρ.

Thesis advisor

Μιχαλόπουλος, Νικόλαος

Abstract

The present work focuses on the study of carbonyl compounds in the atmosphere of Easter Mediterranean. Carbonyl compounds are of great concern with regard not only to their adverse effects to public health and vegetation but also to their critical importance in the complex set of chemical reactions that occur in the troposphere. They are major contributors to urban photochemical smog, being significant sources of free radicals in the atmosphere and acting as precursors to the formation of ozone, peroxy acetyl nitrate, nitric acid and organic aerosols. The performance and validation of the method were evaluated giving optimum results. After the evaluation, the method was applied in the field. Air samples were collected from two different locations of the Eastern Mediterranean. The analytical methodology for the determination of carbonyls was based on the derivatization method TO-11 USEPA using DNPH (2,4 Dinitrophenylhydrazine) cartridges. After sampling the cartridges are extracted with acetonitrile and the eluate is analyzed by HPLC followed by UV detection at 360nm. Nine carbonyls were identified in the ambient air at both locations (remote research station of Finokalia and the suburban area of Voutes, a suburb of Heraklion city). Their concentrations are discussed in extend in this study. The sampling was carried out from November 2008 to July 2009. Totally 180 samples were collected at Finokalia and 190 at Voutes. Based on this data, a diurnal and seasonal circle is recorded for each of the nine carbonyls. Complementary, a set of data comprising of meteorological parameters (temperature, radiation, humidity, rain, wind speed and direction) as well as ozone and NOx concentrations are taken under consideration in order to estimate their impact to the concentration levels of the carbonyl compounds.

Language

Greek

Subject

Acetone

Aketaldehyde

Carbonyl compounds

Eastern Mediterranean

Field Measurements

Formaldehyde

HPLC

TO – 11A

Ακεταλδεΰδη