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Identifier

000465842

Title

Sources of water soluble carbon and nitrogen in size segregated aerosol samples under wood burning conditions at Bolu (Türkiye)

Alternative Title

Πηγές υδατοδιαλυτού άνθρακα και αζώτου σε δείγματα αερολύματος διαχωρισμένα με βάση τη διάμετρο κάτω από συνθήκες καύσης βιομάζας στο Bolu (Τουρκία)

Author

Αλευράκη, Κωνσταντίνα Ι.

Thesis advisor

Μιχαλόπουλος, Νικόλαος

Reviewer

Κανακίδου, Μαρία
Fatma, Ozturk

Abstract

The aim of this study is to identify the sources of Water Soluble Organic Carbon (WSOC) and of Water Soluble Organic Nitrogen (WSON) in size-segregated aerosol samples, collected in the city of Bolu, Türkiye, which experiences severe wood burning conditions during winter time. Note that only very few works in the international literature have reported size segregated measurements of WSOC and especially WSON and this consists one of the main innovations of our work. The sampling period extended from April of 2021 till April of 2022, using a High Volume cascade impactor sampler with six different dimeters D^p > 7.2 μm, 3 μm < d^p < 7.2 μm, 1.5 μm < d^p < 3 μm, 0.95 μm < d^p < 1.5 μm, 0.49 μm < d^p < 0.95 μm and D^p < 0.49 μm. In total 44 sets of a six-stage impactor filters (264 samples in total) were collected during the sampling period. Average WSOC was varied between 2.34 μg m^-3 during summer for PM ¹, to 4.30 μg m^-3 during winter for PM¹, while for PM_10-1 the corresponding values for summer and winter were 4.88 and 6.08 μg m^-3 respectively. Regarding the WSOC/OC ratio, the average value was 0.505, ranging between 0.25 – 0.58 μg m^-3 for PM_2.5-10 and 0.41 – 0.74 μg m^-3 for PM_2.5. The linear regressions of WSOC with biomass burning tracers (Levoglucosan, nss-K⁺) and ions (nss-SO₄^2-) were statistically significant only with the fine fractions, indicating origin from biomass burning. Regarding WSON the average value was 0.73 μg m^-3 for the total of the fractions (median: 0.50 μg m^-3), while it was 0.70 μg m^-3 for PM_2.5 particles (median: 0.48 μg m^-3). A significant amount of WSTN (26.2%) was found to be water soluble (WSON) and the average N/C ratio was found to be 0.136, with a range between 0.054-0.317, indicating possible origin from bacteria or organic nitrates. The correlation for the fine fraction of WSON with Levoglucosan and ions (nss-K⁺, NO₃^-, NH₄⁺ and nss-SO₄^2-) were important and statistically significant, indicating same origin with impact from biomass burning, as well as secondary aerosol formation.

Language

English

Subject

WSOC

WSON

Άζωτο

Υδατοδιαλυτός άνθρακας

Issue date

2024-07-19

Collection

School/Department--School of Sciences and Engineering--Department of Chemistry--Post-graduate theses

Type of Work--Post-graduate theses