Seasonal variability of nitrite and nitrate molar concentrations in fine and coarse particulate matter in coastal urban-industrial environments, and the effect of meteorological conditions on molar ratios

Yıl 2025, Cilt: 7 Sayı: 3, 338 - 346, 30.09.2025

Berrin Gürler Akyüz

https://doi.org/10.51435/turkjac.1759885

Öz

The present study investigates the seasonal variation, atmospheric transformation, and source attribution of nitrite (NO2-) and nitrate (NO3-) in fine (PM2.5) and coarse (PM2.5-10) particulate matter collected over a period of one year in a coastal urban-industrial area characterised by diverse emission sources. A comprehensive measurement programme was conducted to analyse the seasonal dynamics and correlations of nitrogen species. The measurement of molar concentrations (nmol/m³) and nitrate/nitrite molar ratios, as well as meteorological parameters (including temperature, relative humidity, solar radiation, and rainfall), were the scientific basis of this study. The findings indicate that nitrate and nitrite concentrations are notably elevated during the winter months, particularly in the fine fraction. These concentrations exhibit a strong correlation with combustion emissions associated with heating and cold weather conditions, characterised by low-radiation atmospheric conditions. The nitrate/nitrite molar ratios were elevated during the winter months, indicating enhanced oxidative transformation processes influenced by thermodynamic conditions and primary emissions. Pearson's correlation coefficient analysis confirmed a substantial negative relationship between temperature and nitrogen species. This finding emphasises enhanced secondary formation under cold conditions, as well as the significant impact of insolation. The findings of this study provide valuable insights into the complex interplay between anthropogenic emissions, atmospheric chemistry, and meteorological factors in coastal industrial environments. The study under scrutiny here demonstrates the pivotal function of fine-mode nitrate contamination during the heating season and its attendant health ramifications, thus engendering a comprehensive comprehension of paramount importance for the effective management of air quality in such regions.

Anahtar Kelimeler

Nitrite , Nitrate , Molar Concentrations , Molar Ratios , Meteorological Effects

Kıyı kentsel-endüstriyel ortamlarda ince ve kaba partikül maddelerdeki nitrit ve nitrat molar konsantrasyonlarının mevsimsel değişkenliği ve meteorolojik koşulların molar oranları üzerindeki etkisi

Öz

Bu çalışma, çeşitli emisyon kaynaklarının bulunduğu bir kıyı kentsel-endüstriyel alanda bir yıl boyunca toplanan ince (PM2,5) ve kaba (PM2,5-10) partikül maddelerdeki nitrit (NO2-) ve nitrat (NO3-) bileşiklerinin mevsimsel değişimi, atmosferik dönüşümü ve kaynak atıflarını incelemektedir. Azot türlerinin mevsimsel dinamiklerini ve korelasyonlarını analiz etmek için kapsamlı bir ölçüm programı yürütülmüştür. Mol konsantrasyonlarının (nmol/m³) ve nitrat/nitrit mol oranlarının yanı sıra meteorolojik parametrelerin (sıcaklık, bağıl nem, güneş radyasyonu ve yağış dahil) ölçümü, bu çalışmanın bilimsel temelini oluşturmuştur. Bulgular, nitrat ve nitrit konsantrasyonlarının kış aylarında, özellikle ince fraksiyonda belirgin şekilde yükseldiğini göstermektedir. Bu konsantrasyonlar, düşük radyasyonlu atmosferik koşullarla karakterize edilen ısıtma ve soğuk hava koşullarıyla ilişkili yanma emisyonlarıyla güçlü bir korelasyon sergilemektedir. Nitrat/nitrit molar oranları kış aylarında yükseldi, bu da termodinamik koşullar ve birincil emisyonların etkisiyle oksidatif dönüşüm süreçlerinin arttığını gösterdi. Pearson korelasyon katsayısı analizi, sıcaklık ve azot türleri arasında önemli bir negatif ilişki olduğunu doğruladı. Bu bulgu, soğuk koşullarda ikincil oluşumun arttığını ve güneş ışınımının önemli etkisini vurgulamaktadır. Bu çalışmanın bulguları, kıyı sanayi ortamlarında antropojenik emisyonlar, atmosfer kimyası ve meteorolojik faktörler arasındaki karmaşık etkileşime ilişkin değerli bilgiler sağlamaktadır. Burada incelenen çalışma, ısıtma mevsiminde ince mod nitrat kirliliğinin ve bunun sağlık üzerindeki etkilerinin önemli rolünü ortaya koyarak, bu tür bölgelerde hava kalitesinin etkin yönetimi için büyük önem taşıyan kapsamlı bir anlayış sağlar.

Anahtar Kelimeler

Nitrit , Nitrat , Molar Konsantrasyonlar , Meteorolojik Etkiler , Molar Oranlar

Kaynakça

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