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Showing 1 to 20 of 30 for “"Dissolved-phase"”.

  1. Translational Imaging of Pulmonary Gas-Exchange Using Hyperpolarized 129Xe Magnetic Resonance Imaging

    Kaushik, Suryanarayanan Sivaram2014

    … shift in its resonance frequency from the gas-phase (barrier - 198 ppm, RBC - 217 ppm). These unique resonances are collectively called the dissolved-phase of xenon. As the pathway taken by xenon to reach the RBCs is identical to that of oxygen, this dissolved-phase offers a non-invasive probe …

    duke Repository record

  2. Degradation and transport of veterinary antibiotics and estrogens in a vegetated buffer strip system

    Moody, Adam H.University of Missouri--Columbia2022

    … VBS treatments significantly reduced total (dissolved-phase + sediment-bound) SMZ and LIN loads in surface runoff by 29 to 62 percent). Total and dissolved-phase VA loads were significantly reduced only by TF treatment while there was no significant vegetation effect for sediment-bound VAs. …

    missouri Repository record

  3. Adsorption–Desorption Reactions in the Weathering Zone: Implications for Silicate Weathering & the Carbon Cycle

    Knight, AlasdairUniversity of Cambridge2024

    … rates are often derived from measurements of dissolved reaction products (solutes) transported by large rivers. However, this approach may overlook ions chemically bound to the surfaces of sediments, which can be significant in highly erosive regions. To better understand the contribution of …

    cambridge Repository record

  4. The impact of climate change on air-water exchange of toxaphene in Lake Superior

    Knabb, Michelle Elizabeth2013

    … was within the 95% confidence interval of vapor-phase and dissolved-phase toxaphene concentrations. Moreover, the model predicts that climate change will decrease concentrations of toxaphene in the lake faster than if conditions remained the same, however the effect is small. In 2035, the …

    umn Repository record

  5. Mass balance modeling of polychlorinated biphenyls in the Lower Duwamish Waterway

    Burke, Megan ElizabethMassachusetts Institute of Technology2016

    … freshness, suspended sediment concentration, dissolved phase total PCB concentration, and sorbed phase total PCB concentration. The sole freshness source was the Green River and the freshness sink was the flushing at the downstream mouth. PCBs exist in sorbed and freely dissolved phases. …

    mit Repository record

  6. Modeling the Dissolution of Immiscible Contaminants in Groundwater for Decision Support

    Prieto Estrada, Andres EduardoVirginia Tech2023

    … include unknown residual amounts of non-aqueous phase liquids (NAPL) and source zone dimensions, inconsistent historical monitoring of contaminant mass discharge, and the mathematical simulation of field-scale mass transfer processes. Effective methods for simulating NAPL dissolution must …

    vt Repository record

  7. Measurement and behaviour of heavy metals in the marine environment of Singapore

    DANG THE CUONG2006

    … Spain and China, the levels of metals in the dissolved phase, suspended particulate matter and marine sediments are considered to be low in Singapore. With respect to heavy metal contamination, mangrove habitats in Singapore are less contaminated than those found in Deep Bay, Hong Kong and in …

    nus Repository record

  8. Polyethylene devices and the effects of sediment resuspension on the cycling of PAHs and PCBs in the lower Hudson Estuary

    Adams, Rachel G. (Rachel Gwen), 1972-Massachusetts Institute of Technology2003

    … semipermeable membrane devices (SPMDs) and solid-phase microextraction (SPME), PEDs passively measure the concentration of chemical present in the dissolved phase. PEDs provide for in situ, time-averaged measurements with fast equilibration times (on the order of days) and simple laboratory …

    mit Repository record

  9. Evaluation of stormwater control measures for the removal and fate of legacy and emerging contaminants

    Gómez-Ávila, César IvánTexas Tech University2025

    … depends on both the type of contaminant and the phase in which it is present (i.e. dissolved or particle bound). Evaluating SCM performance for legacy contaminants such as polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs), as well as for emerging contaminants such as …

    ttu Repository record

  10. Evaluation of Sedimentation Control as a Best Management Practice for Removing Copper-based Crop Protectants in Plasticulture Runoff

    Stall, Karen MarieVirginia Tech1999

    … soil and entered the groundwater with 10% in the dissolved phase and 8% sorbed to suspended solids. Although only one-percent of the copper was found to leave the field, this was sufficient to cause high copper concentrations (average 2102 ± 433 mg/L total copper and 189 ± 139 mg/L dissolved …

    vt Repository record

  11. Helium and lead isotope geochemistry of oceanic volcanic rocks from the East Pacific and South Atlantic

    Graham, David W. (David William)Massachusetts Institute of Technology1987

    … ³He/ ⁴He between He trapped in vesicles and that dissolved in the glass phase of young alkali basalts at seamount 6 in the East Pacific. ³He/ ⁴He in the glass phase of these alkali basalts is subatmospheric, while in the vesicles it ranges between 1.2-2.5 RA (RA = atmospheric ratio). ³He/ ⁴He in …

    mit Repository record

  12. Multiphase flow and mass transport through porous media

    Snyder, Kevin P.Virginia Tech1993

    … storage tanks, includes both discrete and dissolved phase plume movements through the porous media. Such problems always involve the multiphase flow and mass transport through three phases, namely air, oil, and water. A finite element model is developed in this thesis based on the theory of …

    vt Repository record

  13. Phytoremediation of Weathered Petroleum in Groundwater by Arroyo Willows in Nutrient Amended On-Site Mesocosms

    Bragg-Flavan, Sarah E2019

    … of the groundwater were measured periodically. Dissolved oxygen concentrations were also monitored in each of the mesocosms to determine if the willow trees had any impact on oxygen transfer to the subsurface. In the first run without nutrient amendments the trees did not enhance biodegradation. …

    calpoly Repository record

  14. LITHOLOGIC AND HYDROGEOLOGIC CONTROLS ON THE OCCURRENCE, TRANSPORT, AND FATE OF MTBE IN FINE GRAINED GLACIAL-LACUSTRINE SEDIMENTS

    Sutherland, Mary Kathryn

    … product plume extending under Highway 93, with dissolved phase contamination (including MTBE) extending 460 m west to Spring Creek. Though geochemical sampling has established the general plume extent, the influence of aquifer heterogeneities on plume position and transport behavior is poorly …

    montana-tech Repository record

  15. LITHOLOGIC AND HYDROGEOLOGIC CONTROLS ON THE OCCURRENCE, TRANSPORT, AND FATE OF MTBE IN FINE GRAINED GLACIAL-LACUSTRINE SEDIMENTS

    Sutherland, Mary Kathryn

    … product plume extending under Highway 93, with dissolved phase contamination (including MTBE) extending 460 m west to Spring Creek. Though geochemical sampling has established the general plume extent, the influence of aquifer heterogeneities on plume position and transport behavior is poorly …

    montana Repository record

  16. A computer simulation model for predicting pesticide losses from agricultural lands

    Kenimer, Ann LeeVirginia Tech1987

    … particles, and the movement of pesticides in the dissolved and adsorbed phases. Hydrologic data are generated by the comprehensive watershed model, FESHM; which contains an extended sediment detachment and transport algorithm. PLIERS uses first order rate equations to describe degradation and …

    vt Repository record

  17. Seasonal and interannual variability in the hydrology and geochemistry of an outlet glacier of the Greenland Ice Sheet

    Linhoff, Benjamin S.Massachusetts Institute of Technology and Woods Hole Oceanographic Institution2016

    … largely controlled the 87Sr/86Sr ratio in the dissolved load. Experiments and sampling transects downstream from the GrIS demonstrated that δ234U in the dissolved phase decreased with increasing interaction with the SSL. The (228Ra/226Ra) value of the dissolved load was significantly higher …

    woods-hole Repository record

  18. NAPL (Non Aqueous Phase Liquid) source characterization based on dissolved contaminant concentrations

    Eisenberg, Freddi-Jo, 1967-Massachusetts Institute of Technology2000

    … spatially distributed sources of Non-Aqueous Phase Liquids (NAPLs). Such chemicals are typically persistent sources of groundwater contamination that are difficult to characterize. This work addresses the feasibility of using dissolved concentration measurements to estimate the spatial …

    mit Repository record

  19. The natural and industrial cycling of indium in the environment

    White, Sarah Jane O'ConnellMassachusetts Institute of Technology2012

    … Colorado, and all of this indium exists in the dissolved phase. During an experimental raising of the pH of this system, essentially all of the indium associates with the particulate phases, primarily due to sorption to iron-oxides. Knowledge of the anthropogenic and natural cycling of indium …

    mit Repository record

  20. Seasonal and interannual variability in the hydrology and geochemistry of an outlet glacier of the Greenland Ice Sheet

    Linhoff, Benjamin ShawnMassachusetts Institute of Technology2016

    … largely controlled the 'Sr/'Sr ratio in the dissolved load. Experiments and sampling transects downstream from the GrIS demonstrated that [delta]234U in the dissolved phase decreased with increasing interaction with the SSL. The (2 2 8Ra/2 26Ra) value of the dissolved load was significantly …

    mit Repository record

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