Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Christopher J. Tadanier"'
Publikováno v:
Geochimica et Cosmochimica Acta. 70:4057-4071
In a previous contribution, we outlined a method for predicting (hydr)oxy-acid and oxide surface acidity constants based on three main factors: bond valence, Me–O bond ionicity, and molecular shape. Here, electrostatics calculations and ab initio m
Publikováno v:
Soil Science Society of America Journal. 70:204-214
Due to the acute toxicity of As, mobilization of even a small fraction of As into surface and ground waters used as a source for drinking water represents a substantial risk to human health. Here we evaluate the mobilization of arsenite [As(III)] fro
Publikováno v:
Environmental Science & Technology. 39:3061-3068
This study examined the potential impact of microbially mediated reduction of Fe in the Fe(III)-(hydr)oxide mineral ferrihydrite on the mobility of As in natural waters. In microcosm experiments, the obligately anaerobic bacterium Geobacter metallire
Autor:
Kevin M. Rosso, Barry R. Bickmore, William D. Monn, Dennis L. Eggett, Christopher J. Tadanier
Publikováno v:
Geochimica et Cosmochimica Acta. 68:2025-2042
Bond-valence methods for the prediction of (hydr)oxide solution monomer and surface functional group acidity constants are examined in light of molecular structures calculated using ab initio methods. A new method is presented that is based on these
Autor:
Randall T. Cygan, Barry R. Bickmore, Christopher J. Tadanier, Kevin M. Rosso, Kathryn L. Nagy
Publikováno v:
Clays and Clay Minerals. 51:359-371
The atomic structure of dioctahedral 2:1 phyllosilicate edge surfaces was calculated using pseudopotential planewave density functional theory. Bulk structures of pyrophyllite and ferripyrophyllite were optimized using periodic boundary conditions, a
Publikováno v:
Journal of Environmental Engineering. 129:33-42
Physicochemical separation of organic macrosolutes and colloidal particles is routinely required during the analysis of natural, waste, and process waters derived from aquatic and terrestrial environmental samples. This study was conducted to demonst
Publikováno v:
Soil Science Society of America Journal. 66:1505-1517
ality and crystallography of mineral surfaces involved, and the total concentration of the metal or oxyanion Sorptive interactions at the solid–water interface strongly influence present. However, most nutrient oxyanions and trace the bioavailabili
Publikováno v:
Geomicrobiology Journal. 18:63-76
At the most fundamental level, inter- and intramolecular forces delineate the interface between a microorganism and a mineral surface. A new technique, termed biological force microscopy (BFM), is described that can be used to directly probe the dyna
Publikováno v:
Geochimica et Cosmochimica Acta. 64:3133-3139
Interfacial and adhesion forces between living, unmodified bacterial cells ( Escherichia coli) and mineral surfaces (muscovite, goethite, and graphite) have been directly measured in aqueous solution using a force microscope. Native cells are linked
Publikováno v:
Environmental Science & Technology. 34:2348-2353
Knowledge of dissolved organic matter (DOM) size distribution is of tremendous practical significance in both natural and engineered aquatic and terrestrial systems. This study was conducted to dem...