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 258 for “"VOC"”.
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Control of Volatile Organic Compound (VOC) Air Pollutants
… exist to remove volatile organic compound (VOC) air pollutants from contaminated gas streams. As regulatory and public opinion pressures increase, companies are searching for more effective methods to control these emissions. This document is intended as a guide to help determine if existing …
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VOC Catalytic Oxidation on Manganese Oxide Catalysts Using Ozone
… pollutants known as volatile organic compounds (VOCs) from large volume gas emissions. Silica-supported manganese oxide catalysts with loadings of 3, 10, 15, and 20 wt. % (as MnO2) were characterized using x-ray absorption spectroscopy and x-ray diffraction (XRD). The edge positions in the x-ray …
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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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Polymer/Clay Nanocomposites as Barrier Materials Used for VOC Removal
… the transport of volatile organic compounds (VOC) in indoor air. Building materials are a primary source for VOCs. These emissions are a probable cause of acute health effects and discomfort among occupants and are known to diminish productivity. The predicted concentrations of several of the …
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Modes of Bookkeeping: How Material Samples Illustrate the Limitations of Voc Trading Expertise
Historians have studied the VOC’s textile trade in two extensive but separate bodies of literature—one, the economic historiography, primarily uses numerical evidence, and the other, the art historiography, primarily uses artistic evidence. The bifurcation of the VOC textile historiography by …
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Modeling VOC sorption of building materials and its impact on indoor air quality
Sorption of volatile organic compounds (VOCs) by building materials can have significant effect on the indoor VOC concentration levels and indoor air quality in buildings. The objective of this study was to investigate experimentally the effects of environmental conditions (temperature, humidity …
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Soil gas analysis as a predictor of VOC concentrations in groundwater and stream inflow
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1994.
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Evaluation of filter pack dewatering on Voc concentrations in a simulated low-yield monitoring well
… of dissolved volatile organic compounds (VOCs). It was hypothesized that losses of VOCs would be observed as a result of an increased air-water interface and possibly turbulent flow through the filter pack during water-level recovery; Little or no measurable losses of 1,1,1-TCA, MCB, or …
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VOC Interference with Standard Diesel Particulate Analysis for Mine Samples: Exploring Sources and Possible Solutions
… measurement occurs when volatile organic carbon (VOC) sorbs onto the particulate matter deposit and filter resulting in a positive sampling artifact. To correct for this, a dynamic blank method with two quartz filters (i.e., primary and secondary) in tandem is used. However, the accuracy of the …
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Experimental validation and reliability evaluation of selected soil VOC leaching and volatilization models used in environmental risk assessment
Includes bibliographical references (page 218).
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A Comparison of Solvent and Water-Borne Alkyd Coatings and the History of VOC Regulations in the United States
… due to concerns over volatile organic compound (VOC) content. However, due to recent focus on renewable raw materials, alkyds are making a comeback in waterborne form. Water based alkyd coatings are known to have poor shelf stability and corrosion resistance, as well as other problems during the …
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Commercial diplomacy, cultural encounter and slave resistance : episodes from three VOC slave trading voyages from the Cape to Madagascar, 1760-1780
… and trading as it was recorded by the VOC merchants on the vessels, and is drawn predominantly from the first trading encounter of the crew of De Zan when they arrived in Madagascar in 1775. The second explores the predicaments that the European slave traders encountered on the island, …
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Predictive Modeling of Volatile Organic Compound Measurements
… applications using volatile organic compound (VOC) data have not been as heavily investigated as the aforementioned signals. This thesis takes a first principle approach to analyzing historic VOC data in order to make predictions about future VOC values. The central question that the project …
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Ozone Precursor Sources and Box Modeling of Ozone in Mexico City Under Altered Emission Conditions
… formation regime in the MCMA has transitioned to VOC-limitation, the identification of key VOCs with highest O3 formation potential (OFP) and their precise source identification is essential. In the first task, initial VOC concentrations (IC-VOCs) were calculated for both day and night from …
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Sampling for volatile organic compounds from an aquitard: A field evaluation of screen length, purging method, and sampling time
… contaminated with volatile organic compounds (VOC); Two well-purging methods--(1) pump to the bottom of the screened interval and (2) pump to the top of the screened interval--were evaluated on three monitoring wells with different screened intervals (0.75-m and 3.0-m screen lengths); …
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Study of building material emissions and indoor air quality
… pollutants, such as volatile organic compounds (VOCs). At present, no accurate models are available to characterize material emissions and sorption under realistic indoor conditions. The objective of this thesis is to fill that gap. Using the emission data measured in small-scale and full-scale …
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Evaluation of Stain Blocking Primer Coatings with Low Volatile Organic Compound (VOC) Content and Effects of Drying Conditions on the Properties of Water Reducible Coatings for Polypropylene
… plans to reduce the volatile organic compound (VOC) limit of specialty primers, sealers, and undercoaters (SPSU), also referred to as stain blocking primers, from 350 g/L to 100 g/L in January of 2012. These coatings are primarily used as stain blocking primers over a variety of substrates, such …
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Effects of soil moisture, soil carbonate and organic matter content on vapor phase sorption of volatile organic compounds using inverse gas chromatography
Sorption of VOCs from the vapor phase to soils is an important variable in predicting VOC contaminant movement in unsaturated soils. Experiments were performed which evaluated the effects of soil moisture, carbonate, and organic matter content on VOC sorption. Sorption measurements were performed …
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Development of a Novel Methodology for the Identification of VOC Emission Sources in Indoor Environments based on the Material Emission Signatures and Air Samples measured by PTR-MS
… of indoor Volatile Organic Compound (VOC) emission sources to clearly pinpoint the sources of concern in a field condition. This study represents the first attempt in developing a new technique to find the sources that may be invisible or hidden based on the inspection even of experts …
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