Detailed characterization and hazard level analysis of the ambient fine and ultrafine particulate mixture at a construction site
Başlık çevirisi mevcut değil.
- Tez No: 403108
- Danışmanlar: YRD. DOÇ. DR. JEREMY M. GERNAND
- Tez Türü: Yüksek Lisans
- Konular: Maden Mühendisliği ve Madencilik, Enerji, Mining Engineering and Mining, Energy
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2015
- Dil: İngilizce
- Üniversite: The Pennsylvanıa State Unıversıty
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
Özet yok.
Özet (Çeviri)
Exposure to airborne particulates is an important health concern for workers. Since the biological activity of nanoparticles has been shown to depend on physicochemical properties, it is important to characterize particle size and size distribution, particle number concentration, mass concentration, shape, chemical composition, and surface area to clarify the toxic potential. These parameters that are necessary to comprehend the particles effects on human body need to be analyzed and measured anytime exposure is assessed. As studies on the toxicity of engineered nanomaterials have shown, both size distributions and chemical characteristics are important predictors of the hazard level posed by particulate exposures. Typically these parameters are not all measured simultaneously in the assessment of ambient particulate exposures. Knowing the size, number and mass distributions can better aid to identify cation of the sources of the particles. This study aims to characterize the complex mixture of fine and ultrafine particles present in the workplace by measuring the aerodynamic and physical diameters of particles, characterizing their chemical makeup, and evaluating the concentrations of the ambient aerosol mixture at the construction site. Particles were collected by using a cascade impactor, and transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) were utilized to analyze the particles and establish size distributions separated by particle type (e.g.silica vs. soot). The diameters of particles found in the construction site atmosphere ranged from 0.99 nm to 10500 nm. 89.3% of the particles collected were ultrafine particles (<100nm) or aggregates of ultrafine particles that disaggregated during the collection process. Number and mass particle concentrations detected during sampling ranged from 2.1× 103 to 1.6× 104 particles/cm3, and 33.4 to 270 μg/m3, respectively, which is generally in agreement with previous studies of PM2.5 and PM0.1. Significantly higher numbers of ultrafine particles were observed through direct imaging than were expected. This occurred due to these particles being distributed throughout all stages of the impactor rather than being preferentially collected at the expected location. Particles are consisted of Carbon (41 %), Oxygen (26 %), Silicon (7.66 %),Sulfur (5.1 %), Calcium (4.7 %), along with other trace elements. Also some oxide and carbonate compounds derived from these elements such as calcium carbonate, silicon dioxide (silica), sulfates were identified, and size distributions for each of these particulate chemical species have been resolved. Additionally, shape analysis shows that 72.2 % nanoparticles have almost circular shape with circularity between 0.9 and 1.0. 50.34 % of particles have between 1:1 and 3:1 aspect ratio. These results enable for the first time a comparison of the exposure environment to the hazard level determined through single-particle-type exposure studies. Finally, these results suggest more comprehensive exposure studies should be performed to better understand the hazards of aerosol emissions from a wider array of workplaces.
Benzer Tezler
- Batı Türkiye'de depremsellik ve yer hareketi modellerinin sismik tehlike analizine etkisi
The effects of seismicity and ground motion models on seismic hazard analysis in Western Türkiye
SERAP KIRIM
Doktora
Türkçe
2026
Jeofizik MühendisliğiSakarya ÜniversitesiJeofizik Mühendisliği Ana Bilim Dalı
PROF. DR. MURAT UTKUCU
- Makine öğrenmesinde istatistiksel veriler kullanılarak maruziyetin belirlenmesi: Sakarya ölçeğinde bir çalışma
Determination of exposure using statistical data in machine learning: A case study in Sakarya
MUHAMMED ALİ HAŞILOĞLU
Yüksek Lisans
Türkçe
2024
Deprem MühendisliğiSakarya Üniversitesiİnşaat Mühendisliği Ana Bilim Dalı
PROF. DR. NACİ ÇAĞLAR
- Bir atık barajının sismik yükler ve sürekli yağış etkisinde dinamik analizinin değerlendirilmesi
Evaluation of dynamic analysis of tailings dam under the effect of seismic loads and continuous rainfall
HASAN ÇELT
Yüksek Lisans
Türkçe
2025
Maden Mühendisliği ve Madencilikİstanbul Teknik ÜniversitesiMaden Mühendisliği Ana Bilim Dalı
PROF. DR. ATAÇ BAŞÇETİN
- Ardışık kesirli reaktörlerde azot giderimi
Nitrogen removal in sequencing batch reactors
CANAN DEMİRTUNA
- Fault based probabilistic seismic hazard assessment at different tectonic regimes and data sampling conditions: Emphasis on sensitivity of seismic source characterization
Farklı tektonik rejimlerde ve veri toplama durumlarında fay kaynaklı olasılıksal sismik tehlike analizi: Sismik kaynak karakterizasyonunun duyarlılığına vurgu
SYED TANVIR SHAH
Doktora
İngilizce
2019
Jeoloji MühendisliğiOrta Doğu Teknik ÜniversitesiJeoloji Mühendisliği Ana Bilim Dalı
YRD. DOÇ. DR. ATİLLA ARDA ÖZACAR
DOÇ. DR. ZEYNEP GÜLERCE