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Showing 1 to 20 of 209 for “"VOCs"”.
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Analysis of Ambient VOCs Levels and Potential Sources in Windsor
… of Windsor ambient Volatile Organic Compounds (VOCs). The annual average total VOC concentrations declined from 2005 to 2006. Summer concentrations were higher than winter in both years. All three models results indicated that vehicle-related sources were the major contributors regardless of …
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Modeling VOCs Emissions from Multi-layered Structural Insulated Panels(SIPs)
… Indoor sources of volatile organic compounds (VOCs) are a determinant of air quality in houses. Many materials used to construct and finish the interiors of new houses emit VOCs. These emissions are a probable cause of acute health effects and discomfort among occupants. Ventilation is another …
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Monitoring and Inverse Dispersion Modeling to Quantify VOCs from MSW Landfill
… reactions produce volatile organic compounds (VOCs) like methane and others. Due to heterogeneity in refuse composition, unpredictable distribution of favorable environmental conditions for bacterial actions and highly uncertain pathway of gases, estimation of landfill gas emission for a …
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Study of VOCs Transport and Storage in Porous Media and Assemblies
<p>Indoor VOCs concentrations are influenced greatly by the transport and storage of VOCs in building and furnishing materials, majority of which belong to porous media. The transport and storage ability of a porous media for a given VOC can be characterized by its diffusion coefficient and …
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Development of analytical systems and monitoring of VOCs emissions during polymer processing
… to study total volatile organic compounds (VOCs) emissions during thermal degradation of polymers. This was used to estimate organic emissions from both virgin polymer resins and commingled plastics. The effects of process parameters, i. e., temperature, heating rate and residence time, were …
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Urinary Volatile Organic Compounds (VOCs) in the Diagnosis of Urothelial Bladder Cancer
… cancer urinary volatile organic compounds (VOCs) biomarkers and explore its application in non-invasive diagnosis of bladder cancer. Urinary VOCs are a class of chemical compounds found in urine that generated from biological activities of cells, cancer cells have special metabolic …
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Investigation of Secondary Phases Including Ionic Liquids for Biphasic Bioreactors Treating Hydrophobic VOCs
<p>Volatile organic compounds (VOCs) are a family of chemicals which are known to have adverse effects on climate change and health, and thus emissions of VOCs are regulated. One such control method is via biodegradation in a biofilter and other similar reactors. Many hydrophobic VOCs, however, are …
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Analysis of volatile organic compounds (VOCs) in soil via passive sampling : measuring partition and diffusion coefficients
… method in detecting volatile organic compound (VOCs) concentrations in soil vapors or water. Passive sampling for soil vapor takes an absorptive material and places it underground for a period of time to allow the VOCs to diffuse into the absorptive materials. In this report, I use low density …
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Quantitative analysis of volatile organic compounds (VOCs) in soil via passive sampling : polyethylene sampler design and optimization
… for the release of volatile organic compounds (VOCs) to our natural environment is pervasive. However, the ability to accurately measure and predict VOC soil vapor concentrations is still limited. A polyethylene (PE) quantitative passive sampler using performance reference compounds and deployed …
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Benchtop testing of polyethylene passive sampling towards a quantitative analysis of volatile organic compounds (VOCs) in soil vapours
… analysis of volatile organic compounds (VOCs) was analysed in this work by means of a benchtop testing. A benchtop physical model was setup, which consisted of a jar of glass beads or sand, containing a known mass of toluene as the compound of concern (COC). A beaker of water was placed …
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The Role of Volatile Organic Compounds on Soil Microbial Communities and Ecosystem Processes
… the importance of volatile organic compounds (VOCs) in soil ecosystems. VOCs are produced in abundance and, as vapors, they are able to travel through soil more rapidly than DOC. This dissertation aims to investigate the importance of VOCs commonly produced during the decomposition of leaf …
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An investigation of the production of volatile organic compounds (VOCs) by <i>Trichoderma</i> spp. and their mode of action against <i>Serpula lacrymans</i>
… component analysis of the <i>Trichoderma </i>VOCs resulted in the identification of 8 volatile compounds, mainly ketones, which were implicated as the active VOCs involved in the inhibition of <i>S. lacrymans</i>. The range and quantity of volatiles produced was dependent on the <i>Trichoderma …
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In vitro analysis of volatile organic compounds in search of potential biomarkers of lung cancer
… is the analysis of volatile organic compounds(VOCs). VOCs are a diverse group of carbon-based chemicals that are present in exhaledbreath and biofluids, and may be collected from the headspace of these matrices. Differentpatterns of VOCs have been correlated with various diseases, cancer among …
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Designing bifunctional materials for in-situ capture and conversion of volatile organic compounds
<p>”Volatile organic compounds (VOCs) are a class of organic liquid compounds with low vapor pressures, which enables them to vaporize at ambient conditions. VOCs are largely toxic, carcinogenic, and mutagenic, and have profound adverse effects on human health and the ecological environment. Many …
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Numerical study of solute transport in deformable soil liners
… breakthrough of volatile organic contaminants (VOCs) is a core <br/>concern to design a effective barrier. Conventional methods of analysis assume that the soil is fully saturated. However, throughout much of the world unsaturation exists in landfill basal liner. Although a few investigations …
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Ozone Precursor Sources and Box Modeling of Ozone in Mexico City Under Altered Emission Conditions
… 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 measured VOCs (MC-VOCs). The fraction reacting …
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Developing novel tools to explore the marine volatilome
Key volatile organic compounds (VOCs) such as dimethyl sulfide (DMS) and isoprene have been extensively studied for their importance as semiochemicals and in climate regulation. In contrast, disentangling the myriad of signature VOCs in gas chromatographicdata has received much less attention. This …
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