Showing papers in "Applied Geochemistry in 1998"

TL;DR: The accumulation chamber methodology allows one to obtain reliable values of the soil CO2 flux in the range 0.2 to over 10 000 g m−2 d−1, as proven by both laboratory tests and field surveys in geothermal and volcanic areas as discussed by the authors.

TL;DR: Porewater concentration profiles were determined for Fe, trace elements (As, Cd, Co, Cu, Mn, Ni, Pb, Zn), sulfide, SO4 and pH in two Canadian Shield lakes (Chevreuil and Clearwater).

TL;DR: In this article, the authors measured the dissolution rates of 3 clays from St. Austell and two treated industrial smectites using batch reactors at 35° and 80°C.

TL;DR: In this paper, As and U concentrations in ground water of the southern Carson Desert appear to be affected by evaporative concentration, redox reactions, and adsorption, and the relation of these elements with Cl suggest that most of the high concentrations can be attributed to evaporative concentrations of Carson River water, the primary source of recharge.

TL;DR: In this article, the proportions of the various inputs (marine, distant or local) are determined in rainwater samples collected in the Massif Central (France) over a period of one year.

TL;DR: In this article, a new method for the determination of dissolved gas species in natural waters is presented based on the equilibrium partition of gases between a liquid and a gaseous phase after the introduction of host gas.

TL;DR: The results of an integrated geochemical and mineralogical study conducted at the Agnico-Eagle gold-mine tailings impoundment, Joutel, Quebec, are correlated with bacterial populations determined from an enumeration of three groups of Thiobacilli as mentioned in this paper.

TL;DR: Tritium/helium-3 (3H/3He) and chlorofluorocarbon (CFCs) data were used to date the young fraction of mixtures from a karstic limestone aquifer near Valdosta, Georgia, where regional paleowater in the Upper Floridan aquifer receives recharge from two young sources as mentioned in this paper.

TL;DR: In this article, the authors measured the dissolution and recrystallization rates in KOH solutions using a batch reactor at 35° and 80°C, respectively, for up to one year.

TL;DR: In this article, a tracer test from a borehole to the railway tunnels in the Triassic sandstone aquifer beneath Liverpool and the Mersey Estuary, England, U.K. showed that the presence of a low permeability fault exerts a strong control on local groundwater chemistry.

TL;DR: In this paper, the concentration and speciation of rare earth elements (La, Ce, Nd, Sm, Eu, Tb, Yb, and Lu) were determined by instrumental neutron activation analysis (INAA).

TL;DR: A small-scale artificial tracer test performed on a schist aquifer in Brittany has helped clarify mechanisms and kinetics of in situ autotrophic denitrification as mentioned in this paper.

TL;DR: In this article, the authors evaluate the effectiveness of common selective dissolution treatments in determining the association of minerals with potentially toxic trace elements, and find that ammonium oxalate and EDTA treatments, which are thought by some workers to dissolve only poorly crystalline phases, were found to dissolve a significant amount of crystalline goethite.

TL;DR: In this paper, a slow flow, plug-through reactor was developed for measuring equilibrium and kinetic parameters of biogeochemical reactions on intact sections of sediment cores, and the experimental approach was designed to preserve the structural, geochemical and microbiological integrity of the sediment sections and retrieve reaction parameters that apply to in-situ conditions.

TL;DR: In this article, the authors studied the water quality of the Litheos river in the city of Trikala, Greece, and its drainage area, and showed that the presence of several polluting sources leads to significant variations in the concentrations and distributions of main pollutants, which are elevated in the neighbourhood of polluting activities in various parts of the river.

TL;DR: In this paper, a sediment core from Puck Bay in the Gulf of Gdansk was used to investigate the anthropogenically enriched 15 elements with depth in two sediment cores.

TL;DR: In this article, leaching experiments in aqueous media were carried out on nonradioactive and radioactive nuclear waste glasses to investigate the release behavior of 4 actinides (Th, U, Np and Pu) and 3 lanthanides (La, Ce and Nd) from the solid into solution.

TL;DR: In this article, the authors report the hydrogeochemical modeling of a complicated suite of reactions that take place during the oxidation of pyrite in a marine sediment, including dissolution of calcite, cation and proton exchange, and CO2 sorption.

TL;DR: Partitioning transition metals in reduced and oxidised zones of sulphide-bearing fine-grained sediments is discussed in this article, where the transition metals are separated into two groups.

TL;DR: In this article, the kinetics of calcite precipitation from high salinity waters (up to 2 mol kg−1) have been studied by a pH-free-drift method in a closed water system.

TL;DR: In this paper, the authors used X-ray absorption near edge structure (XANES) and high concentration chemical sorption experiments, as well as very low concentration tracer experiments, to determine I2, I(V) and I (-I) in supernatant solutions and slurries of minerals.

TL;DR: In this paper, the authors used radionuclide time tracers ( 137 Cs, 134 Cs) to establish the present-day and historical levels of pollutants since the late 1930s.

TL;DR: In this article, a comparative geochemical and isotopic study of confined and unconfined Chalk groundwaters of the Paris Basin and the N German Basin proves a significant chemical evolution during groundwater flow from the recharge zones to the deep confined aquifer.

TL;DR: In this article, a gravity-fed, battery-powered, portable continuously-stirred tank reactor has been developed to directly measure aqueous reaction rates in the field, and the results indicate the reactor is well-mixed.

TL;DR: In this paper, the authors used experimentally measured and theoretically estimated thermodynamic data, the distribution of species for La, Ce and Nd have been calculated and also the solubility of pure, endmember (La, Ce, Nd) phosphate phases of the monazite structure in selected hot spring fluids.

TL;DR: In this paper, the authors used a geothermometer to identify the origin of hydrothermal CH4 from sedimentary and crystalline rocks, and showed that the principal characteristic of these gases, excess CH4, appears to have a Geothermometric function.

TL;DR: In this article, the authors studied the Chernobyl radionuclide distribution and mobility in soils and uptake by plants in seminatural and agricultural moraine and in fluvioglacial landscapes typical for the areas of the Bryansk region affected by the accident.

TL;DR: In this article, the European Communities Bureau of Reference (BCR) and Chunguo sequential extraction procedures were employed to evaluate the retention of U and As by a soil contaminated with low level radioactive waste.

TL;DR: Strontium isotope ratios were measured on 13 rock, 18 leachate and 28 pore-water samples from the Milk River aquifer, the confining argillaceous formations, and the glacial till mantling the recharge area as mentioned in this paper.