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Octanol-Water Partition Coefficients
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Octanol-Water Partition Coefficients ab 535.49 € als gebundene Ausgabe: . Aus dem Bereich: Bücher, Wissenschaft, Technik,

Anbieter: hugendubel
Stand: 12.07.2020
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Octanol-Water Partition Coefficients
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Octanol-Water Partition Coefficients ab 535.49 EURO

Anbieter: ebook.de
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A review on the sorption of organic compounds i...
39,90 € *
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Sorption is considered the most important abiotic process for determining the fate and transport of organic contaminants in the environment. Sorption of organic pollutants by natural sorbents (soils, sediments, clays, humic materials, and dissolved organic matters), factors affecting sorption and sorption coefficients for selected pollutants are reviewed on the basis of the literature results and interpretations, with varieties of references examined. The most significant aspects of the sorption process are discussed: sorption isotherms and sorption kinetics, effects of sorbent physico-chemical characteristics (Water Solubility, Polar/Ionic Character, Octanol/Water Partition Coefficient, Acid/Base Chemistry Oxidation/Reduction Chemistry etc.),effect of the temperature, sorption of volatile compounds, effect of the sorbent concentration, The experimental and prediction methods adopted for the determination and estimation of the sorption coefficients are also described. Literature sorption coefficients for selected hydrophobic, polar, and ionizable compounds are collected.

Anbieter: Dodax
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Partition coefficient
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.In organic chemistry and the pharmaceutical sciences, a partition (P) or distribution coefficient(D) is the ratio of concentrations of a compound in the two phases of a mixture of two immiscible solvents at equilibrium. Hence these coefficients are a measure of differential solubility of the compound between these two solvents. Normally one of the solvents chosen is water while the second is hydrophobic such as octanol. Hence both the partition and distribution coefficient are measures of how hydrophilic or hydrophobic a chemical substance is. Partition coefficients are useful for example in estimating distribution of drugs within the body. Hydrophobic drugs with high partition coefficients are preferentially distributed to hydrophobic compartments such as lipid bilayers of cells while hydrophilic drugs preferentially are found in hydrophilic compartments such as blood serum.

Anbieter: Dodax
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Synthesis and QSAR of thia-Derivatives of Aroyl...
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Syntheses of thirty-one aroylacrylic acids, twenty-seven 2-[(carboxymethyl)sulfanyl]-4-oxo-4-arylbutanoic acids (CSAB), three 2-[(2-carboxyethyl)sulfanyl]-4-oxo-4-arylbutanoic acids, one 2-[(1-carboxyethylsulfanyl]-4-oxo-4-arylbutanoic acid, one 2-[(2-methoxy-2-oxoethyl)sulfanyl]-4-oxo-4-arylbutanoic acid and one 2-ethoxycarbonylmethylsulfanyl]-4-oxo-4-arylbutanoic acid, are described. Conformational preferences of CSAB in polar and non-polar solvents, DMSO and chloroform, are examined. Analysis of conformational preferences in solution (NAMFIS analysis) is performed, using 1H NMR, NOESY, J-HMBC spectra, and conformational assemblies of compound obtained by CS in Macro Model and OMEGA. Most abound conformers in non-polar chloroform have an extended shape - largest part of apolar surface area of molecules are exposed to solvent. Advantages of methods based on 3D structure of compounds for the estimation of n-octanol/water partition coefficients (logP values) are briefly outlined. In 'extended' conformations divalent S atom could form non-covalent intermolecular interactions with other heteroatoms (O, N) in closest proximity.

Anbieter: Dodax
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Analytical methods for Pesticide Technical and ...
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A pesticide is any substance or mixture of substances intended for preventing, destroying, or controlling any pest including vectors of human or animal diseases, unwanted species of plants or animals causing harm during, or otherwise interfering with, the production, processing, storage, or marketing of food, agricultural commodities, wood and wood products, or animal feedstuffs, or which may be administered to animals for the control of insects, arachnids or other pests in or on their bodies. The physical-chemical properties usually provided for regulatory purposes are necessary to identify and describe the active ingredient and the product. Vapour pressure, water solubility, and octanol/water partition coefficient have particular value in the prediction of the environmental behavior of a pesticide. The nature and amount of data required for pesticide registration depends on the properties and use of each substance. Research resources should be focused on the identification and evaluation of major risks, and data requirements which are excessive and stifle innovation must be avoided.

Anbieter: Dodax
Stand: 12.07.2020
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Experimental investigations on the influence of...
20,45 € *
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In this work, MBT residual waste was used for experimental studies to investigate the influence of crucialparameters influencing biochemical processes in anaerobic degradation in residual wastes from MBT. Themoisture content is one of the most critical parameters influencing biogas production in waste as well asnutrient transport. Batch experiments were carried out to correlate moisture content and biogas production inMBT residual waste. Moreover, quantification and monitoring of heterogeneous moisture distribution in alandfill body is critical for mechanical landfill stability and landfill gas emission control. For quantitativelymonitoring in-situ moisture distribution in in MBT residual waste, a novel geoelectrical technique wassuccessfully applied and evaluated on laboratory scale. The pH development in leachate from MBT residualwastes and the relating acid buffering intensity was found to be important for facilitating biochemicalconversion of solid organic carbon matter to biogas. At unadjusted conditions, a positive correlation betweenstrength of acidification phase and biogas production, especially methane production, could be found.Thereby, the acid buffer intensity of MBT residual wastes proved to be crucial for pH stabilisation. Due tomaximum cumulative biogas production at neutral pH, pH regulation at pH 7 is recommended for wastetreatment in MBT plants and landfill bioreactors. The bioavailability of metabolic intermediates wasinvestigated with regard to their sorption behaviour on MBT residual wastes. Alcohols of a homologousseries with increasing octanol-water partition coefficients POW were used as surrogates for carboxylic acids.Activated carbon was used as a reference sorption system due to its high specific surface area. Bydetermining the distribution coefficient KD, the bioavailability factor Bf was quantified and denotes thatbioavailability of the surrogates was practically unlimited. Transferring these results to intermediates of theanaerobic degradation with similar log POW values, e.g. acetic acid and propionic acid, reveals thatbiodegradation of certain organic substrates e.g. acetic acid or propionic acid can be considered unconfinedin MBT residual waste.

Anbieter: Dodax
Stand: 12.07.2020
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Experimental investigations on the influence of...
27,90 CHF *
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In this work, MBT residual waste was used for experimental studies to investigate the influence of crucial parameters influencing biochemical processes in anaerobic degradation in residual wastes from MBT. The moisture content is one of the most critical parameters influencing biogas production in waste as well as nutrient transport. Batch experiments were carried out to correlate moisture content and biogas production in MBT residual waste. Moreover, quantification and monitoring of heterogeneous moisture distribution in a landfill body is critical for mechanical landfill stability and landfill gas emission control. For quantitatively monitoring in-situ moisture distribution in in MBT residual waste, a novel geoelectrical technique was successfully applied and evaluated on laboratory scale. The pH development in leachate from MBT residual wastes and the relating acid buffering intensity was found to be important for facilitating biochemical conversion of solid organic carbon matter to biogas. At unadjusted conditions, a positive correlation between strength of acidification phase and biogas production, especially methane production, could be found. Thereby, the acid buffer intensity of MBT residual wastes proved to be crucial for pH stabilisation. Due to maximum cumulative biogas production at neutral pH, pH regulation at pH 7 is recommended for waste treatment in MBT plants and landfill bioreactors. The bioavailability of metabolic intermediates was investigated with regard to their sorption behaviour on MBT residual wastes. Alcohols of a homologous series with increasing octanol-water partition coefficients POW were used as surrogates for carboxylic acids. Activated carbon was used as a reference sorption system due to its high specific surface area. By determining the distribution coefficient KD, the bioavailability factor Bf was quantified and denotes that bioavailability of the surrogates was practically unlimited. Transferring these results to intermediates of the anaerobic degradation with similar log POW values, e.g. acetic acid and propionic acid, reveals that biodegradation of certain organic substrates e.g. acetic acid or propionic acid can be considered unconfined in MBT residual waste.

Anbieter: Orell Fuessli CH
Stand: 12.07.2020
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Handbook BOOK
264,00 CHF *
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A comprehensive compendium of published property estimation techniques for organic compounds. For scientists and engineers seeking to estimate properties of compounds, this time-saving Handbook brings together in one compact volume a vast array of property estimation methods from more than 2,700 published sources for calculating these and many other properties of organic compounds: * Density and molar volume * Boiling point * Refractive index and molar refraction * Melting point * Surface tension and parachor * Water solubility * Viscosity * * Air/water partition coefficient * Vapor pressure * Octanol/water partition coefficient * Enthalpy of vaporization * Soil/water partition coefficient. The property estimation techniques detailed in the Handbook have been chosen for their broad applicability and practical value. The discussion of each estimating technique includes a clear exposition of the technique, including classes of compounds for which it is applicable and critical consideration of its strengths and weaknesses, as well as many worked-out examples demonstrating the technique. The Handbook can be used on its own or in tandem with the Toolkit for Estimating Physicochemical Properties of Organic Compounds, an easy-to-use, Windows(r)-based program that puts rapid estimation routines and flexible search capabilities at the user's fingertips. The Toolkit CD features routines for estimating key properties of organic compounds and a database of property and other data for more than 24,000 organic compounds. Also available: Toolkit for Estimating Physicochemical Properties of Organic Compounds ISBN 0-471-19492-1 (CD-ROM) * Toolkit for Estimating Physicochemical Properties of Organic Compounds ISBN 0-471-17263-4 (book/CD-ROM set)

Anbieter: Orell Fuessli CH
Stand: 12.07.2020
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