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Showing 1 to 20 of 78 for “"arsenate"”.
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Lead arsenate suspension and protective colloids
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1920.
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Electrochemical Deactivation of Nitrate, Arsenate, and Trichloroethylene
… mechanism, kinetics and feasibility of nitrate, arsenate, and trichloroethylene inactivation on zerovalent iron (ZVI), mixed-valent iron oxides, and boron doped diamond film electrode surfaces, respectively. Nitrate ( ) is a common co-contaminant at sites remediated using permeable reactive …
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Electrolytic remediation of chromated copper arsenate wastes
While chromated copper arsenate (CCA) has proven to be exceptionally effective in protecting wood from rot and infestation, its toxic nature has led to the problem of disposal of CCA-treated lumber and remediation of waters and soils contaminated by process wastes. The active ions in water-based …
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Adsorption Properties of Roxarsone and Arsenate on Goethite and Kaolinite
… adsorption is similar, suggesting that the arsenate functional group is the dominant control on roxarsone adsorption. However, there are some subtle differences between adsorption of As(V) and roxarsone, which can be explained by the relative sizes of the molecules, the presence of …
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Struktur und Eigenschaften übergangsmetallhaltiger Oxo-Arsenate(III) der Selten-Erd-Elemente
Diese Arbeit befasst sich mit der Synthese und Charakterisierung neuer Verbindungen der Selten-Erd-Elemente. Im Vordergrund steht die Entwicklung neuer Synthesestrategien zum Aufbau von Verbindungen, in denen Selten-Erd-Elemente und Übergangsmetalle mit Oxo-Arsenat(III)-Anionen zu komplexen …
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Interactions of arsenate, natural organic matter (NOM), and goethite (a-FEOOH)
Includes bibliographical references.
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Oxo-Selenate(IV) und Oxo-Arsenate(III) der Selten-Erd-Metalle und ihre Derivate
In dieser Arbeit wurden Oxo-Selenate(IV) und Oxo-Arsenate(III) der Selten-Erd-Elemente synthetisiert und, wo immer möglich, mittels Kristallstrukturanalyse, Thermoanalyse, Schwingungsspektroskopie und optischer Spektroskopie charakterisiert. Die Oxo-Selenate(IV) CuM2(SeO3)4 (M = La, Pr-Nd, Sm-Gd) …
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Online sorting of wood treated with chromated copper arsenate using laser induced breakdown spectroscopy
The use of the CCA chemical as a wood treatment to protect against insect and fungal deterioration has had commercial application for the past twenty-five to thirty years. While CCA treated wood has several benefits, with perhaps the most important being the saving of an estimated 225 million trees …
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Retardance of rainwater-leached metals from CCA-treated (chromated copper arsenate) wood ash in soil
The burning of wood treated with chromated copper arsenate (CCA) preservative produces an ash that contains high concentrations of copper, chromium, and arsenic. The subsequent leaching of these metals from burn sites can produce soil and water contamination. Soils have varying natural abilities to …
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Kinetics, mass transfer, and mass re-equilibrium for arsenate adsorption on iron oxide-based carbons
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI-COLUMBIA AT AUTHOR'S REQUEST.] Removal of arsenic (As) from drinking water sources is much needed worldwide, and small water treatment systems, such as point-of-use (POU) treatment, could be an effective solution for residential applications. …
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A tunable light source at 1.6 [mu]m by difference-frequency mixing in cesium titanyl arsenate
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Historical Use of Lead Arsenate and Survey of Soil Residues in Former Apple Orchards in Virginia
… to control pests in agriculture. Lead arsenate (PbHAsO4) was first used in apple orchards in the late 1890's to combat the codling moth, Cydia pomonella (Linnaeus). The affordable and persistent pesticide was applied in ever increasing amounts for the next half century. The persistence …
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Characterisation of Schwertmannite - Geochemical Interactions with Arsenate and Chromate and Significance in Sediments of Lignite Opencast Lakes
… sink in natural systems. By means of the anions arsenate and chromate, the uptake capacity by adsorption or substitution and consequential changes in crystal structure were characterised. Additionally, a possible re-mobilisation of these compounds was investigated because the metastable …
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The Economic Impacts of Soil Remediation Efforts at Lead Arsenate Contaminated Sites in Yakima County: A Hedonic Approach
<p>Area-wide lead-arsenate contamination stemming from the widespread use of pesticides in the early 1900s poses a serious health risk to the residents of Yakima, Washington. Soil testing for contaminants resulted in the Department of Ecology funding the remediation of 6 elementary schools in …
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On Competitive Adsorption of Oxyanions by Soils (Freundlich Equation, Enthalphy of Adsorption, Selectivity Coefficient, Anion Mixtures, Anion)
… anionic mixtures (binary-solute combinations of arsenate, molybdate, and phosphate) by three soil samples (Cecil clay, EPA-14, and Catlin silt loam) was investigated using batch equilibrium techniques. The adsorption of arsenate and molybdate by all three soils was significantly reduced by the …
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The heat capacities of potassium dihydrogen arsenate and ammonium dihydrogen phosphate from 15 to 300⁰K. the anomalies at the curie points
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, 1941
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Oxidized mesoporous ZrO2/carbon composites for arsenic removal
… and comparing the adsorption performances of arsenate on oxidized mesoporous ZrO2/Carbon composites and unoxidized composites. The mesoporous ZrO2/Carbon composites were synthesized via a facile evaporation induced triconstituent co-assembly approach by using Pluronic F127 as a template and …
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The Effect of Modifying the Higher-Order Structure of Plant High-Affinity Phosphate Transporters
… involved in the transport of phosphate and arsenate and have a high capacity for transporting phosphate in areas where phosphate concentrations are low, behaving as the main mechanism of phosphate uptake by plants. The Pht1 family in Arabidopsis thaliana contains nine members, of which …
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Chemistry of arsenic in soils of north-east New South Wales / by Euan Smith.
… sampled and assessed for their capacity to sorb arsenate (Asv) in relation to soil properties.
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Measurement of inorganic arsenic and chromium species in southern Nevada groundwater using ion chromatography-inductively coupled plasma mass spectrometry
… were used to separate inorganic arsenite from arsenate and trivalent from hexavalent chromium in southern Nevada groundwater. Method detection limits were found to be 0.011 ppb and 0.005 ppb for arsenite and arsenate respectively, and 0.015 ppb and 0.02 ppb for trivalent and hexavalent chromium …
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