Showing papers in "Applied Geochemistry in 2017"

TL;DR: The 2011 WHO Guidelines for Drinking-Water Quality (fourth edition) advised a health-based value of 70μg/L for Mo but this is no longer promulgated as a formal guideline value as WHO consider such concentrations to be rarely found in drinking water as discussed by the authors.

TL;DR: The GEMAS (geochemical mapping of agricultural soil) project collected 2108 Ap horizon soil samples from regularly ploughed fields in 33 European countries, covering 5.6 million km2 as discussed by the authors.

TL;DR: The results suggest that urbanization may dramatically increase major ions, ionic strength, and pH over decades from headwaters to coastal zones, which can impact integrity of aquatic life, infrastructure, drinking water, and coastal ocean alkalinization.

TL;DR: Wang et al. as discussed by the authors discussed the progress of geochemical studies on arsenic through an analysis of the hydrogeology of karst areas, and proposed that studies of arsenic pollution should be combined with the spatial distribution and redox characteristics of groundwater, and attention should be paid to chemical compositions of water, soil, and rocks as well as adsorption-desorption processes between water and sediment.

TL;DR: In this paper, the authors investigated the chemical interaction of hydraulic fracturing fluids with a variety of shales of different mineralogical texture and composition, and found that dissolution of both pyrite and carbonate minerals occurred rapidly, releasing metal contaminants and generating porosity.

TL;DR: A review of the literature regarding the effectiveness of soil Pb remediation for reducing Pb exposure and BLL in children, and suggests best practices for addressing the epidemics of low-level Pb poisoning occurring in many inner city areas is presented in this paper.

TL;DR: In this article, the authors performed laboratory experiments with Marcellus Shale and lab-generated hydraulic fracturing fluid at elevated pressures and temperatures to evaluate mineral reactions and the release of trace elements into solution.

TL;DR: In this article, the main hydrogeochemical processes affecting thermal water composition, including mixing and degassing, were identified and qualified, and then a reliable reservoir temperature was estimated by using geothermometrical modeling.

TL;DR: In this paper, the differences in the chemical character of dissolved organic matter (DOM) are present in groundwater in the Holocene and the Pleistocene aquifers that may influence dissolved As concentrations, shallow groundwater and surface water samples were collected from four study sites in Murshidabad district, India, and analyzed for water chemistry parameters and characteristics of DOM.

TL;DR: In this article, the spatial distribution of rare earth elements (REEs) and their influencing factors in urban soils were investigated. But, there is little information about the spatial patterns of REEs in urban areas.

TL;DR: In this paper, the selective and irreversible adsorption mechanism of cesium on illite was summarized by hydrated ion size, charge density and hydration energy, and the mechanism was proved by using barium.

TL;DR: In this paper, surface complexation of rare earth elements to iron oxyhydroxides (Fe(OH)3(a)) was described by using the Donnan diffuse layer model and a two-site (i.e. ≡FesOH and ≡FewOH) model.

TL;DR: In this paper, the role of soils in extending the lag time between road salt application and the delivery of Na and Cl to shallow groundwater in a temperate environment was explored, and it was shown that these soils slowly release Na and C for at least 2.5-5 months following salt application, which helps explain the year-round persistence of high salt concentrations in some surface waters and groundwaters.

TL;DR: In this article, the potential mobility and availability of vanadium (V) in different types of soil profiles from Germany and Egypt were assessed using the sequential extraction technique of the Commission of the European Communities Bureau of Reference (BCR).

TL;DR: In this article, the trace element distributions in UOCs can be related to the geologic conditions in which the source uranium ore formed, and hence are characteristic for each deposit type.

TL;DR: In this article, a multiscale investigation on the viability of employing ground granulated blast-furnace slag alone and the slag activated with cement and MgO (M-GGBS) in stabilization/solidification (S/S) of zinc contaminated clayey soil is presented.

TL;DR: In this article, the potential of acid mine drainage (AMD) generation by waste material at XKS mine by using paste pH, acid base accounting and net acid generation geochemical static tests was also investigated.

TL;DR: In this article, the authors examined the organic composition and toxicology of water and sediments in a stream adjacent to an underground injection disposal facility that handles UOG wastewaters.

TL;DR: In this paper, the authors studied the geochemistry of anthropogenic Tl in sediments and compared the total contents and geochemical fractionation of Tl and the other metals in the upper, middle and bottom horizons of core A and core B.

TL;DR: In this paper, the amount of trace metals from natural and anthropogenic sources was examined in a middle-to-upper income residential area in Spokane, Washington which was developed in the late 1800s but has not experienced heavy industrial activity.

TL;DR: The proposed hybrid approach improves the high variation topsoil spatial pollution forecasting, which might be utilized in the environmental modeling.

TL;DR: A simple flushing model shows that the increase in As concentrations with depth and groundwater age at this site, and at other sites in the Bengal and Red River Basins, can be attributed to the evolution of the aquifer over 100-1000 years as aquifer sands are gradually flushed of their initial As content.

TL;DR: In this paper, the influence of the origin, composition and availability of natural organic matter on the hydrochemical variability in the aquifers of Van Phuc was explored, where carbon isotope signatures (δ13Corg) and C/N ratios were assessed in combination with lithology, geochemistry, hydrochemistry, hydrology and the distribution of specific biomarkers.

TL;DR: In this paper, the effects of oxygen isotope exchange with CO2, high temperature equilibration with bedrock minerals and mineral dissolution and precipitation reactions on the CO2-rich water isotopic composition were reviewed.

TL;DR: In this article, the effects of sulfur redox cycling on As speciation and mobilization under a strongly reducing environment were investigated in shallow groundwater systems, and the authors found that sulfidogenesis may significantly contribute to the mobilization of As via sulfide-induced reduction of both As-bearing Fe(III) oxide minerals and As(V).

TL;DR: In this article, the authors reviewed the transformation principles and processes by physical, chemical, and biological reactions in realgar mining and found that the migration processes, operating from source to atmosphere, water and soil, lead to contamination situations.

TL;DR: In this article, a multiscale and multimethod approach was used to investigate biogeochemical processes in the Rio San Giorgio streambed, showing that dense vegetation in the streambed controlled its morphology, velocity of streamflow, and, as reflected by observed bromide-tracer loss, enhanced water exchange between streambed and the hyporheic zone.

TL;DR: In this paper, the efficiency of a monolayer cover to prevent acid mine drainage from two pre-oxidized tailings impoundments was assessed using the MIN3P code, a finite volume model for coupled groundwater flow, oxygen diffusion and multi-component reactive transport.

TL;DR: In this paper, three dissolved OP compounds, were selected as adsorbents to investigate their adsorption behavior on two typical iron oxides, and the results showed that the formation of nonprotonated and protonated bidentate complexes were the dominant mechanisms in the initial stage (∼10min) and the following stage (10-1440min) during the adsorbption process, respectively.

TL;DR: In this article, the potential drawdown of CO2 directly from the atmosphere by the enhanced weathering of peridotites and basalts in seawater was assessed, and the results demonstrate that the ball-milled dunite and harzburgite changed dramatically the chemical composition of the seawater within a few hours.