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Modeling acid-gas generation from boiling chloride brines
Springer Science and Business Media LLC - Tập 10 - Trang 1-10 - 2009
Guoxiang Zhang, Nicolas Spycher, Eric Sonnenthal, Carl Steefel
This study investigates the generation of HCl and other acid gases from boiling calcium chloride dominated waters at atmospheric pressure, primarily using numerical modeling. The main focus of this investigation relates to the long-term geologic disposal of nuclear waste at Yucca Mountain, Nevada, where pore waters around waste-emplacement tunnels are expected to undergo boiling and evaporative co...... hiện toàn bộ
Frontiers and advances in environmental soil chemistry: a special issue in honor of Prof. Donald L. Sparks
Springer Science and Business Media LLC - Tập 21 Số 1 - 2020
Young‐Shin Jun, Mengqiang Zhu, Derek Peak
Periodic density functional theory calculations of bulk and the (010) surface of goethite
Springer Science and Business Media LLC - Tập 9 - Trang 1-16 - 2008
James D Kubicki, Kristian W Paul, Donald L Sparks
Goethite is a common and reactive mineral in the environment. The transport of contaminants and anaerobic respiration of microbes are significantly affected by adsorption and reduction reactions involving goethite. An understanding of the mineral-water interface of goethite is critical for determining the molecular-scale mechanisms of adsorption and reduction reactions. In this study, periodic den...... hiện toàn bộ
Density functional theory modeling of chromate adsorption onto ferrihydrite nanoparticles
Springer Science and Business Media LLC - Tập 19 - Trang 1-12 - 2018
James D. Kubicki, Nadine Kabengi, Maria Chrysochoou, Nefeli Bompoti
Density functional theory (DFT) calculations were performed on a model of a ferrihydrite nanoparticle interacting with chromate ( $$ {\text{CrO}}_{4}^{2 - } $$ ) in water. Two configurations each of monodentate and bidentate adsorbed chromate as we...... hiện toàn bộ
Phenylalanine as a hydroxyl radical-specific probe in pyrite slurries
Springer Science and Business Media LLC - Tập 13 - Trang 1-18 - 2012
Shawn C Fisher, Martin AA Schoonen, Bruce J Brownawell
The abundant iron sulfide mineral pyrite has been shown to catalytically produce hydrogen peroxide (H2O2) and hydroxyl radical ( . OH) in slurries of oxygenated water. Understanding the formation and fate of these reactive oxygen species is important to biological and ecological systems as exposure can lead to deleterious health effects, but also environmental eng...... hiện toàn bộ
Alkaline decomposition of synthetic jarosite with arsenic
Springer Science and Business Media LLC - Tập 14 - Trang 1-9 - 2013
Francisco Patiño, Mizraim U Flores, Iván A Reyes, Martín Reyes, Juan Hernández, Isauro Rivera, Julio C Juárez
The widespread use of jarosite-type compounds to eliminate impurities in the hydrometallurgical industry is due to their capability to incorporate several elements into their structures. Some of these elements are of environmental importance (Pb2+, Cr6+, As5+, Cd2+, Hg2+). For the present paper, AsO43- was incorporated into the lattice of synthetic jarosite in order to carry out a reactivity study...... hiện toàn bộ
A comparison of aggregation behavior in aqueous humic acids
Springer Science and Business Media LLC - Tập 2 - Trang 1-5 - 2001
Christi Young, Ray von Wandruszka
The ability of six humic acids (HAs) to form pseudomicellar structures in aqueous solution was evaluated by five techniques: size exclusion chromatography; pyrene fluorescence enhancement; the pyrene I1/I3 ratio; the cloud point of dilute HA solutions; and the fluorescence anisotropy of HAs. Soil HAs were found to aggregate most easily, both on microscopic and macroscopic scales. The formation of ...... hiện toàn bộ
Influence of soil minerals on chromium(VI) reduction by sulfide under anoxic conditions
Springer Science and Business Media LLC - Tập 8 - Trang 1-10 - 2007
Yeqing Lan, Baolin Deng, Chulsung Kim, Edward C Thornton
The effects of soil minerals on chromate (CrVIO42-, noted as Cr(VI)) reduction by sulfide were investigated in the pH range of 7.67 to 9.07 under the anoxic condition. The examined minerals included montmorillonite (Swy-2), illite (IMt-2), kaolinite (KGa-2), aluminum oxide (γ-Al2O3), titanium oxide (TiO2, P-25, primarily anatase), and silica (SiO2). Based on their effects on Cr(VI) reduction, thes...... hiện toàn bộ
A geochemical view into continental palaeotemperatures of the end-Permian using oxygen and hydrogen isotope composition of secondary silica in chert rubble breccia: Kaibab Formation, Grand Canyon (USA)
Springer Science and Business Media LLC - Tập 19 Số 1 - Trang 1-10 - 2018
Kenny, Ray
The upper carbonate member of the Kaibab Formation in northern Arizona (USA) was subaerially exposed during the end Permian and contains fractured and zoned chert rubble lag deposits typical of karst topography. The karst chert rubble has secondary (authigenic) silica precipitates suitable for estimating continental weathering temperatures during the end Permian karst event. New oxygen and hydroge...... hiện toàn bộ
The nature and fate of natural resins in the geosphere. XII. Investigation of C-ring aromatic diterpenoids in Raritan amber by pyrolysis-GC-matrix isolation FTIR-MS
Springer Science and Business Media LLC - Tập 7 - Trang 1-9 - 2006
Ken B Anderson
Upper Cretaceous amber from the Raritan Formation (Sayerville, New Jersey) has been investigated by Pyrolysis-GC-MS and Pyrolysis-GC-matrix isolation FTIR-MS. Results establish the existence of two distinct forms of amber in this deposit. Both forms are Class Ib ambers, but they are unambiguously differentiated on the basis of their (intact) diterpenoid composition. The presence of callitrisate in...... hiện toàn bộ
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