Showing papers in "Applied Geochemistry in 2004"

TL;DR: In this paper, the authors investigated the mechanism of As release to anoxic ground water in alluvial aquifers, and sampled ground waters from 3 piezometer nests, 79 shallow ( 80 m) wells, in an area 750 m by 450 m, just north of Barasat, near Kolkata (Calcutta), in southern West Bengal.

TL;DR: Arsenic in the groundwater of Bangladesh is a serious natural calamity and a public health hazard as discussed by the authors, and most groundwater from the shallow alluvial aquifers (<150 m, particularly in the Holocene plai...

TL;DR: In this article, the authors analyzed the impact of CO2 immobilization through carbonate mineral precipitation in aquifers, and found that the amount of CO 2 that may be sequestered by precipitation of secondary carbonates is comparable with and can be larger than the effect of dissolution in pore waters.

TL;DR: In this article, the authors examined redox processes that lead to As mobilization in groundwater, and deduced from isotopic signatures of δ34SSO4 and 3H2O (3H) to delineate the nature of redox changes for some of the reducing groundwaters.

TL;DR: In this article, the translocation ratio of Pb from vetiver roots to shoots was significantly increased after 5.0 mmol EDTA kg−1 of soil application and nearly 126 mm of rainfall irrigation.

TL;DR: In this paper, sources of As in the Ganges sediments and microbial mechanisms of its release in groundwater were examined in the present study, where the authors have systematically examined the pertinent mineral species present in the sediments using XRD, TEM-EDS and EPMA techniques.

TL;DR: In large parts of rural Argentina people depend on groundwater whose As content exceeds the Argentine drinking water standards (0.05 mg l(-1)). The most affected areas are located in the Chaco-Pamp...

TL;DR: In this paper, the reduction of NO3−, by Fe0, was carried out using Fe0 powder in unbuffered solutions from pH 2 to greater than 10, where the initial pH of the solution was adjusted to 2, 3, or 4 by addition of HCl, H2SO4, or CH3COOH.

TL;DR: In this paper, a set of surface complexation reactions for synthetic hydrous Mn oxide (HMO) using a two surface site model and the diffuse double layer SCM is presented.

TL;DR: An attempt to identify the hydrogeochemical processes that accompany current or past intrusion of seawater in the Castell de Ferro coastal aquifer (SE Spain) was made using ionic deltas, ionic ratios and saturation indices as mentioned in this paper.

TL;DR: In this paper, the effect of different adsorbent/As ratios, adsorption sites density, area available for adorption, pH changes and competition of As for adsorbing sites with other dissolved species such as phosphate.

TL;DR: In this article, the authors examined the effect of Fe precipitation on the rare earth element (REE) geochemistry of acid mine waters to determine the pH range over which REEs behave conservatively.

TL;DR: In this paper, a large number of geochemical data gathered on the Gruppo di Voltri springs confirm that progressive interaction of meteoric waters with ultramafic rocks variably affected by serpentinization leads initially to the formation of Mg-H CO3 waters when the system is open to CO2, and Na-HCO3 and Ca-OH type water upon further interaction with the rock, under highly reducing closed-system conditions with respect to CO 2.

TL;DR: In this paper, the authors evaluate published reports on As redox preservation and explain discrepancies in the literature, and evaluate the results of synthetic laboratory preservation experiments and time stability experiments conducted for natural water samples from several field sites.

TL;DR: In this paper, combined hydrogeological and hydrogeochemical data allow flow systems and the origins of solutes in the Honeysuckle Creek area of the southeastern Murray Basin, which is an area affected by dryland salinity, to be constrained.

TL;DR: In this article, about 200 samples from selected public supply, domestic, and observation wells completed in alluvial aquifers underlying the western Mojave Desert were analyzed for total dissolved Cr and Cr(VI).

TL;DR: In this article, a mineralogical study of 3 samples of municipal solid waste incineration bottom ash collected from different storage sites and with storage times varying from 3 weeks to 2 years, has enabled identification of the main secondary mineral species formed during weathering.

TL;DR: In this article, the application of a calcite barrier was investigated to prevent P release from eutrophic lake sediments, and different calcite materials varying in grain size, specific surface area (SSA) and roughness of the surface were applied.

TL;DR: The hydrogeochemistry of the Lac du Bonnet granitic batholith has been determined for the region of the Whiteshell Research Area (WRA) in southeastern Manitoba, Canada as discussed by the authors, where groundwaters and matrix pore fluids were obtained by standard sampling methods from shallow piezometers in clay-rich overburden, from packer-isolated borehole zones intersecting fractures or fault zones in the bedrock, and from boreholes in unfractured rock in AECL's Underground Research Laboratory (URL).

TL;DR: In this article, the influence of siliceous low-temperature hydrothermal fluid on the elemental concentrations and mineralogical characteristics of the late Permian anthracitic coal seam (No. 30) from the Zhijin Coalfield in western Guizhou Province, SW China was described.

TL;DR: In this paper, stable isotopes and major ions in groundwater and surface waters in Belize, Central America were analyzed to identify processes that may affect drinking water quality, and the results indicated rapid recharge of groundwater aquifers, groundwater influence on surface water chemistry and the potential of surface water to impact groundwater quality.

TL;DR: In this article, the effect of variable Al source and alkali-activator on the final properties of fly ash-based Geopolymers as characterised by compressive strength testing, infrared and X-ray diffraction analyses.

TL;DR: In this paper, the mass balances of heavy metal (Zn, Cd, Cu and Pb) in the Lot-Garonne fluvial system have been established for 1999 and 2000.

TL;DR: In this paper, the authors used the geochemical modeling code PHREEQC to understand the evolution of groundwater in Datong, China, and showed that coal mining is the main contamination source for groundwater from the alluvial fan in addition to agricultural activities.

TL;DR: Water samples from short screen monitoring wells installed along a 90-km transect in southwestern Kansas were analyzed for major ions, trace elements, isotopes (H, B, C, N, O, S, Sr), and dissolved gases (He, Ne, N2, Ar, O2, CH4) to evaluate the geochemistry, radiocarbon ages, and paleorecharge conditions in the unconfined central High Plains aquifer as mentioned in this paper.

TL;DR: For example, the authors found that slags collected from smelter sites associated with historic base-metal mines contain elevated concentrations of trace elements such as Cu, Zn and Pb.

TL;DR: In this paper, the authors modeled the diffusion of an alkaline plume from concrete into bentonite with the PHREEQC geochemical code to determine, as a function of time, modifications to mineral surfaces, dissolution of existing minerals and precipitation of new mineral phases.

TL;DR: In this article, the authors investigated the application of the dual-isotope approach to understand the N hydrochemistry of urban groundwater, and collected data from two multi-level piezometers in the Sherwood sandstone aquifer beneath Nottingham in the English Midlands, UK.

TL;DR: Pearce, Nicholas, Westgate, J.A., Perkins, W.T., Preece, S.J., and Westgate as discussed by the authors applied ICP-MS methods to tephrochronological problems.