Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 41 for “"semi-volatile"”.
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Proximity to Potential Sources and Mountain Cold-trapping of Semi-volatile Organic Contaminants
If sufficiently persistent, semi-volatile organic contaminants (SVOCs) can travel long distances through the atmosphere from their points of release and become concentrated in cold, remote regions. As air is sampled for SVOCs to establish both their presence and the success of emission reduction …
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Toward an Understanding of Children’s Exposure to Semi-Volatile Organic Compounds in the Indoor Environment
The prevalence of smoking has declined significantly from the middle of the last century in most developed nations. Since the mid-1990s however, the rates of decline have slowed and prevalence of smoking among young women is projected to rise in some countries (World Health Organization, 2011; …
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Measurement, Characterization, and Source Apportionment of the Major Chemical Components of Fine Particulate Material, Including Semi-Volatile Species
… suspended atmospheric particulate matter. Semi-volatile material (SVM), consisting of ammonium nitrate and semi-volatile organic material (SVOM), is not accurately measured by EPA accepted methods such as the Federal reference method (FRM) or Tapered Element Oscillating Microbalance (TEOM). …
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Particle-chemical interactions and environmental chemodynamics of fine and ultrafine particles in a natural disaster scenario
… chemicals from the water column, and release volatile and semi-volatile organic compounds to the gas phase upon exposure to air. Ultrafine particles which are photoreactive can degrade these vapor-phase contaminants, and may transform the molecules into species which are more toxic or …
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Analysis of Organic Pollutants by Micro Scale Liquid-Liquid Extraction and On-column Large Volume Injection Gas Chromatography
… is time consuming and can cause losses of semi-volatile components, in addition to requiring a relatively large amount of organic solvent (180 mL). By performing the extraction directly in a GC autosampler vial using one milliliter of contaminated water and one milliliter of organic …
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Modeling Arsenic, Antimony, And Selenium Partitioning During Coal Combustion
… selenium-are of particular interest due to their semi-volatile nature.</p> <p>Modeling the partitioning of semi-volatile elements-arsenic, antimony, and selenium-is the focus of this undertaking. Programming was done in C++ with particle-time-temperature inputs from computational fluid dynamics …
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Development & Testing of Novel Atmospheric Chemistry Technologies
… TAG) for hourly speciation of hundreds of semi-volatile and non-volatile organic compounds. Development and construction of the Combustion Chamber, PAM Chamber, and TAG system are discussed as well as preliminary applications of this equipment. These instruments allow for the study of …
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Semi-Packed Micro Gas Chromatography Columns
… premier technique for separation and analysis of volatile and semi-volatile organic compounds. Miniaturization of analytical systems has become a major trend which is mainly driven by advancements in microfabrication techniques and a need for portable lab-on-a-chip systems for onsite monitoring. …
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Characterization of aroma and flavor compounds present in lambic (gueuze) beer
… of flavor and aroma compounds, (2) determine the volatile composition and acids of commercially available lambic gueuze using SPME/GC-MS and HPLC, and (3) determine the major aroma compounds of aging lambic beer using GC-O. Comparing the two extraction methods, both SPME and SAFE were able to …
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Light-activated materials for singlet oxygen generation and the degradation of pollutants
… namely propranolol, along with several semi-volatile and volatile organic pollutants. Specifically, UV- and visible light-activated membranes were synthesized by the simple method of doping a photosensitizer (PS) into a polyurethane substrate, ClearFlex 50 (CF50). Upon irradiation, these …
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Feasibility of sustainable recycling of drill cutting as additive in flexible base
… (TPH) mobility but had minimal effect on semi-volatile organic compounds (SVOCs) and increased trace metal leaching. Cement significantly improved compressive strength but had limited effect on TPH and SVOCs mobility. Its performance was reduced in the presence of hydrocarbons due to …
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Surface-Layer Semivolatiles Impact on Hydrochar Application For Fuel and Environment
… in this dissertation focus on the extraction semi-volatile organic compounds from the surface of hydrochar known as secondary char (SC). Over the past decade, studies have shown SC to be a hinderance in HC application for fuels and the environment, due to early burn-out time and phytotoxicity …
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Volatility properties of the ambient and laboratory generated aerosol
… classification, aerosols are often found in low volatile and semi-volatile organic aerosol (LVOA + SVOA).
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Profiling and putative aroma biomarker identification for flavor in potatoes using a trained sensory panel and HS-SPME GC-MS
… sweet, sour, bitter, and savory, refers to non-volatile chemical compounds that are detected by epithelial cells in the mouth. The aroma fraction encompasses volatile or semi-volatile chemical compounds that are sensed by nerve cells within the olfactory system, particularly during the chewing …
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Appraisal and validation of rapid, integrated chemical and biological assays of environmental quality
… BTEX RaPDD Assay® ELISA is evaluated to detect semi-volatile hydrocarbons in contaminated groundwater. Although overestimating concentrations when compared to GC-FID/PID, results are well correlated. Secondly, the effectiveness o f the BTEX and c-PAH RaPID Assay® to detect hydrocarbons in …
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Impact of an Epoxy Pipe Lining Material on Distribution System Water Quality
… consumption, total organic carbon (TOC), semi-volatile organic compounds (SVOCs), disinfectant byproduct (DBP) formation, and odor. Results of the study showed relatively low impacts on water quality, as all USEPA drinking water regulations were met. Impacts were highest during the first …
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Intraurban Variability of Ambient Particulate Matter
… barriers; meteorological patterns; behavior of semi-volatile components; and measurement errors. Intraurban variability is often gauged by conducting measurements at a network of monitoring stations across the region of interest. While certain statistical metrics are commonly used and …
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Improving vacuum ultraviolet spectroscopy using instrumental modifications and chemometric applications.
Gas chromatography (GC) is a method of separating volatile and semi-volatile analytes in the gas phase. GC is often paired with a detection technique such as mass spectrometry (MS). GC-MS is a widely-used technique that allows for both qualitative and quantitative measurements of mixtures of …
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Developing Reference Materials for VOC, Formaldehyde and SVOC Emissions Testing
Volatile organic compounds (VOCs) and semi-volatile organic compounds (SVOCs) constitute important classes of indoor contaminants. Emissions of VOCs and SVOCs from myriad building materials and consumer products cause high indoor concentrations with health risks that may be orders-of-magnitude …
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Investigation into the partitioning of Lindane between air and dust in indoor environments
The investigation of harmful semi volatile organic compounds (SVOC) in the indoor environment is important because on average people spend over 90% of their time indoors. Lindane, an SVOC which was widely used in the UK until 2004, adsorbs to house dust. House dust acts as a reservoir for such …
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