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Showing 1 to 20 of 47 for “"chemical speciation"”.
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Computer modelling of the chemical speciation in seawater
… thesis is to establish a computer model of the chemical elements in seawater and to use this model to gain insight into the chemical processes controlling dissolution, precipitation, redox levels and coordinative interactions in surface seawater. In order to accomplish this task a relatively …
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Computer-aided chemical speciation in metal-based drug design
Formation constants of Cu²⁺, Ni²⁺, Zn²⁺, Ca²⁺ and Gd³⁺ with the polyamine(amide) ligands N,N' -bis(2-hydroxyiminopropionyl) propane-1,3-diamine (L² ) and (1, 15)- bis(N,N-dimethyl)-5, 11-dioxo-8-(N-benzyl)-l ,4,8, 12, 15-pentaazapentadecane (L³ ) as well as those of Gd³⁺ with …
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Physico-chemical speciation and ocean fluxes of Polycyclic Aromatic Hydrocarbons
Thesis (Ph. D.)--Joint Program in Oceanography, Massachusetts Institute of Technology/Woods Hole Oceanographic Institution, 1997.
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The chemical speciation of potential dermally-absorbed copper-based antiinflamatory drugs
… trend of the different species of the chemical models was similar as pH was increased from 2 to 11. Molecular mechanics calculations were used to propose the geometry of the solution species based on the strain energy of each of the possible geometries. Out of four possible coordination …
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Computer aided chemical speciation in designing metal-based potential anti-inflammatory agents
The objective of this study was to develop copper based anti-inflammatory agents for the treatment of inflammation associated with Rheumatoid Arthritis. Four low molecular ligands, N,Nt-di(aminoethylene)-2,6-pyridine dicarbonylamine (PrDH), Bis-(N,N-dimethylethyl)-2,6-pyridinedicarboxamide (PrDM), …
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The seasonal cycling and physico-chemical speciation of iron on the Celtic and Hebridean shelf seas
… Hebridean Shelf Seas, and determines the physico-chemical speciation of Fe supplied from oxic margins. The results from repeated field surveys of the central Celtic Sea showed a nutrient type seasonal cycling of dissolved Fe (< 0.2 µm; dFe), which is surprising in a particle rich shelf system, …
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Concentrations, Distributions and Chemical Speciation of Zinc and Cadmium in the Equatorial and South Atlantic Ocean
… of a metal (MTD) is distributed among different chemical species and this chemical speciation dictates a metal's bioavailability. Strong organic metal-binding ligands greatly affect the metal's chemical speciation in the ocean, potentially limiting phytoplankton growth by reducing the …
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Characterization and chemical speciation modelling of saline effluents at Sasol Synthetic Fuels Complex-Secunda and Tukuta power station
… or what has been removed from a water stream. Chemical speciation could identify effluent streams where CO2 dissolution had taken place.
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Ion Current Rectification in Nano/Micro-Fluidic Interfaces and Pulsed Glow Discharge Time-of-Flight Mass Spectrometric Chemical Speciation
… continues to be of interest for analyzing chemical and biological samples because of the disposability, portability, low sample consumption, fast analysis time, and parallel analysis potential for multiple samples in a single device. To improve microfluidic device functionality, integrated …
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Chemical speciation and spatial distribution of heavy metals and their adsorption onto sediments of the Berg River, Western Cape, South Africa
… zone in the country. In this study, the chemical speciation of heavy metals in the river sediment was determined in order to evaluate the extent of pollution. Chemical speciation using sequential chemical extraction of sediment samples was used to measure the mobility and bioavailability …
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Fabrication, Validation, and Performance Evaluation of a New Sampling System for the In-Situ Chemical Speciation of Chromium Ions in Groundwater Using Supported Liquid Membranes (SLMs)
… has been fabricated to facilitate the in-situ speciation of Cr. Teflon® was selected as the material for the samplers because of its inert chemical nature. The design of the sampler is based on the Supported Liquid Membrane (SLM) extraction technique, which utilizes charged organic carrier …
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Effect of driving cycles on the particulate mass and number emissions from in-use heavy heavy-duty diesel vehicles
… vehicles operating on different driving cycles. Chemical speciation results are also presented to discuss the formation and composition of particles emitted during various cycles. Tests were performed with West Virginia University's Transportable Heavy Duty Vehicle Emissions Testing Laboratory …
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The development of analytical methods to elucidate the chemical forms of Cu, Zn, Cd and Pb in soil contaminated by sewage sludge and other effluents.
… of an analytical method to determine the chemical speciation of heavy metals in soils contaminted by sewage sludge and distillery wastes. Chapter one serves as an introduction discussing the various heavy metal species that can occur in soils. The chapter also contains a review of the …
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Modeling contaminant transport in polyethylene and metal speciation in saliva
Properties of both chemical contaminants and polymers can impact contaminant diffusivity and solubility in new and aged polyethylene materials for pipes and geomembranes. Diffusivity, solubility, polymer and chemical properties were measured for thirteen contaminants and six polyethylene materials …
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Selenium Distribution and Cycling in the Eastern Equatorial Pacific Ocean
… that are of biological importance, with the chemical speciation and solubility depending on the actual redox poise of the waters. One redox sensitive trace element of interest is selenium, which can be both toxic and essential for organisms, depending on its chemical speciation. In 2013, the …
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Development of methods for the detection of chemical and biological warfare agents
… of weapons of mass destruction, be that chemical, explosives, or biological, and find unique ion signals for those materials. Chapter 2 examines how to improve the analytical capability of the pulsed glow discharge through an increased understanding of the ionization processes inherent to …
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Measurement and behaviour of heavy metals in the marine environment of Singapore
… and bioavailability, a further study on the chemical speciation of heavy metals in the marine sediments from the two sampling sites was determined using a modified BCR-sequential extraction procedure. In addition, concentrations of heavy metals in the SML and subsurface water, sediments and …
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Characterization and source apportionment of ambient PM2.5 in Atlanta, Georgia: on-road emission, biomass burning and SOA impact
… and biogenic nature in origin. Detailed PM2.5 chemical speciation was conducted including over one hundred of GC/MS-quantified organic compounds, organic carbon (OC), water-soluble organic carbon (WSOC), elemental carbon (EC), ionic species, and tens of trace metals. Day-night, seasonal and …
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Chemical modelling of urine
… The model is used in the computation of chemical speciation and degree of precipitation by means of equilibrium constants and solubility products. The urine model was developed in order to investigate some of the factors associated with urolithiasis. A specific model development procedure …
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Modeling chalcopyrite leaching kinetics
… from 415 to 550 mV (Ag/AgCl). A model of chemical speciation in the bulk solution elucidates the idea of passivation caused by precipitation of ferric species and their consequent adsorption onto the chalcopyrite surface. Electrochemical studies on massive samples of chalcopyrite involving …
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