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Sunday, July 26, 2020 | History

2 edition of Reactions of aqueous aluminum species at mineral surfaces found in the catalog.

Reactions of aqueous aluminum species at mineral surfaces

David Wayne Brown

Reactions of aqueous aluminum species at mineral surfaces

by David Wayne Brown

  • 22 Want to read
  • 5 Currently reading

Published by U.S. Govt. Print. Off. in Washington .
Written in English

    Subjects:
  • Aluminum salts.,
  • Surface chemistry.,
  • Water chemistry.

  • Edition Notes

    Bibliography: p. 48.

    Statementby D. W. Brown and J. D. Hem.
    SeriesChemistry of aluminum in natural water, Geological Survey water-supply paper ;, 1827-F
    ContributionsHem, John David, 1916- joint author.
    Classifications
    LC ClassificationsTC801 .U2 no. 1827-F, QD181.A4 .U2 no. 1827-F
    The Physical Object
    Paginationiv, 48 p. :
    Number of Pages48
    ID Numbers
    Open LibraryOL4855394M
    LC Control Number75619064

      Dissolved silica (SiO2) is supplied to the environment by chemical and biochemical weathering processes despite the fact that dissolved silica has many stable and unstable dissolved forms (silica species). The processes involve ion substitution and chelate forming reactions which remove mineral lattice cations. The concentration of dissolved silica in natural waters is determined by a. Chemical equations--For aqueous, exchange, and surface species, chemical reactions must be association reactions, with the defined species occurring in the first position after the equal sign. For phases, chemical reactions must be dissolution reactions with the formula for the defined phase occurring in the first position on the left-hand side.

    complex reaction mixtures in the hydrothermal synthe-sis of zeolites, [16] sol-gel one-pot synthesis of mullite and cordierite [17], or synthesis of tetramethoxysilane from a variety of silicate minerals and dimethyl carbon-ate [18]. The five- and six-coordinate silicates were observed even in aqueous solutions at high concentra-. Chlorate is an important Cl-bearing species and a strong potential Fe(II) oxidant on Mars. Since the amount of oxychlorine species (perchlorate and chlorate) detected on Mars is limited (<~1 wt.%), the effectiveness of chlorate to produce iron oxides depends heavily on its oxidizing capacity. Decomposition of chlorate or intermediates produced during its reduction, before reaction with Fe.

    @article{osti_, title = {Kinetics and mechanism of surface reaction of salicylate on alumina in colloidal aqueous suspension}, author = {Wang, Z and Ainsworth, C C and Friedrich, D M and Gassman, P L and Joly, A G}, abstractNote = {The reaction kinetics of salicylate with Al(III) in aqueous solution and at the colloidal alumina-water interface was studied by stopped-flow laser. The reactions of aqueous gold complexes with H2Se and H2S are important for transportation and deposition of gold in nature and for synthesis of AuSe-based nanomaterials but are scantily understood. Here, we explored species formed at different proportions of HAuCl4, H2Se and H2S at room temperature using in situ UV-vis spectroscopy, dynamic light scattering (DLS), zeta-potential .


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Reactions of aqueous aluminum species at mineral surfaces by David Wayne Brown Download PDF EPUB FB2

REACTIONS OF AQUEOUS ALUMINUM SPECIES AT MINERAL SURFACES By D. BROWN and J. HEM ABSTRACT Aqueous aluminum solutions containing x10 molar aluminum in molar NaClC>4 were partly neutralized with NaOH to give OH: Al mole ratios from to Measured amounts of montmorillonite, kaolinite, volcanic ash, or feldspathic sand wereCited by: 5.

Additional Physical Format: Online version: Brown, David W. (David Wayne), Reactions of aqueous aluminum species at mineral surfaces. Reston, Virginia: U.S. Aqueous aluminum solutions containing. 10 4 molar aluminum in molar NaC were partly neutralized with NaOH to give OH:A1 mole ratios from to Measured amounts of montmorillonite, kaolinite, volcanic ash, or feldspathic sand were added to provide an area of inert surface.

Reactions that occurred during days of aging were compared with those in similar. Reaction of Al (III) with other inorganic ions, organic materials and mineral surfaces Competing with hydroxyl ion for formation of aluminum complexes are ligands such as F- and S Considering a pH value of pH 5 and the Al(III) present as fluoride complexes or A13+ or Al(OH)2+, from equilibrium data for aluminum hydroxy monomers and fluoride Cited by: Aqueous aluminum solutions containing x 10/sup -4/ molar aluminum in molar NaClO/sub 4/ were partly neutralized with NaOH to give OH:AL mole ratios from to Measured amounts of montmorillonite, kaolinite, volcanic ash, or feldspathic sand were added to provide an area of inert surface.

This chapter focuses on mineral surfaces and some of the factors affecting their chemical reactivity with water and aqueous species.

It presents a brief overview of the geochemistry of mineral surfaces, focusing on metal-oxide and metal-(oxy)hydroxide surfaces, including their dissolution mechanisms, development of electrical charge when in contact with aqueous solutions, and uptake of aqueous.

Furthermore, Keggin-Al 13 species have been used as experimental models to determine reaction rates and pathways of oxygen exchange reactions between the aqueous phase and specific surface sites. When aluminum salts enter the aqueous solution, the aluminum ions undergo a step-by-step hydrolysis reaction at pH > ; at low aluminum concentrations (i.e., less than mol/L), the majority.

A pyrogenic alumina (type C, Degussa) was studied. The original product contains chlorine impurity (∼1 × mol/g), the hydrolysis of bound chlorine results in acidic species in aqueous suspension. Heat treatment at °C proved to be an effective purification.

Potentiometric acid−base titration was used to characterize the surface charging of alumina in electrolyte solutions (KNO3. As a result of mineral phase solubility constraints, concentrations of aqueous Al increase exponentially with decreases in pH below Monomeric Al occurs as a series of complexes in the aqueous environment, including aquo, OH−, F−, SO4 2−, HCO3 − and organic species.

The kinetic stability of oxide surfaces affects a broad range of physical phenomena, including mineral dissolution 1,2,3 and sorption reactions 4, stable-isotope fractionation 5.

Substitution of a hydroxide or fluoride ion for a water molecule in the inner-coordination sphere of Al(OH2)63+ considerably weakens bonds from aluminum to other water molecules that are also in the inner-coordination sphere.

The labilizing effect of these substitutions on the rate of dissociation of Al−O bonds is a model for ligand-promoted dissolution of aluminum (hydr)oxide minerals. Here. Certain deacidification methods use non-aqueous media to distribute alkaline mineral particles such as MgO within the pages of the treated books.

Evidence is considered here as to whether or not the proximity of alkaline particles within such documents is sufficient to neutralize the acidic species present. THE SURFACE CHEMISTRY OF ALUMINUM OXIDES AND HYDROXIDES the mineral-water interface,” and the surfaces of aluminum oxides and hydroxides are particularly reactive in comparison to other minerals in the soil environment.

Probably one of the most important topics in this context is the geochemical control of dissolved. ISBN: OCLC Number: Description: pages: illustrations ; 25 cm: Contents: The quantitation of aqueous aluminum / Paul R. Bloom and M. Susan Erich --Aqueous equilibrium data for mononuclear aluminum species / Darrell Kirk Nordstrom and Howard M.

May --Inorganic aluminum-bearing solid phases / Bruce S. Hemingway and Garrison Sposito --Aqueous. From the early s up to aboutpapermakers used aluminum sulfate, an acidic compound, in most printing papers. Certain deacidification methods use non-aqueous media to distribute alkaline mineral particles such as MgO within the pages of the treated books.

Aluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number It is a silvery-white, soft, non-magnetic and ductile metal in the boron mass, aluminium makes up about 8% of the Earth's crust, where it is the third most abundant element (after oxygen and silicon) and also the most abundant metal.

Reactions of aluminium metal. Aluminium reacts with most nonmetals upon heating, forming compounds such as aluminium nitride (AlN), aluminium sulfide (Al 2 S 3), and the aluminium halides (AlX 3).It also forms a wide range of intermetallic compounds involving metals from every group on the periodic table.

Aluminium has a high chemical affinity to oxygen, which renders it suitable for use as a. Interactions of ferrous iron with clay mineral surfaces during sorption and subsequent oxidation†.

Natacha Van Groeningen a, Laurel K. ThomasArrigo a, a, Laurel K. ThomasArrigo a. Geochemists pay special attention to reactions that occur between mineral surfaces and aqueous species – interactions central to weathering and soil formation, hydrothermal ore deposition, pH buffering, biomineralization and biofilm formation, uptake and release of chemicals that affect water quality, and many other natural processes.

Keywords: aluminum, aluminum surface finishing, corrosion causes, corrosion troubleshooting Introduction A protective oxide film of aluminum is only stable in a pH range of to 1 Chemical operations for the metal surface of aluminum include many process solutions that intentionally exceed this pH range for cleaning, metal removal and.A.

Aqueous Aluminum Chemistry 1. Mononuclear Aluminum Species Most of the following information comes from the review by Nordstrom and May (), with additional information as indicated. “Mononuclear” refers to, etc., Al:ligand complexes, such as the Al hydroxy species (Al 3+, AlOH2+, etc.; Figures 1 and 3A).As a result of mineral phase solubility constraints, concentrations of aqueous Al increase exponentially with decreases in pH below Monomeric Al occurs as a series of complexes in the aqueous environment, including aquo, OH- F- SO, HCO3- and organic species.