Themed collection Geochemistry

78 items - Showing page 1 of 2
Perspective

Retrospective on microbial transformations of halogenated organics

Prior to the 1960s, knowledge of biological transformations of highly halogenated aliphatic compounds was limited, except in mammalian organisms where enzymatic transformations occurred to rid the body of ingested harmful chemicals.

Graphical abstract: Retrospective on microbial transformations of halogenated organics
From the themed collection: Geochemistry
Open Access Tutorial Review

Environmental significance of trace elements in the Athabasca Bituminous Sands: facts and misconceptions

The distribution of trace elements (TEs) in the bituminous sands is dichotomous: V, Ni, Mo, Se and Re are found predominantly in the bitumen fraction, and all other TEs in the mineral fraction.

Graphical abstract: Environmental significance of trace elements in the Athabasca Bituminous Sands: facts and misconceptions
From the themed collection: Recent Open Access Articles
Tutorial Review

Fluorophores in surface freshwaters: importance, likely structures, and possible impacts of climate change

Fluorescence spectroscopy is very useful for the characterisation of organic matter in natural water samples. The importance of protein-like fluorescence might be enhanced by several events induced by warming in natural waters such as lake water.

Graphical abstract: Fluorophores in surface freshwaters: importance, likely structures, and possible impacts of climate change
From the themed collection: Geochemistry
Tutorial Review

Multi-element (C, H, Cl, Br) stable isotope fractionation as a tool to investigate transformation processes for halogenated hydrocarbons

A review that highlights the utility of multi-element compound-specific isotope analysis (CSIA) in halogenated hydrocarbon remediation.

Graphical abstract: Multi-element (C, H, Cl, Br) stable isotope fractionation as a tool to investigate transformation processes for halogenated hydrocarbons
From the themed collection: Geochemistry
Tutorial Review

Photochemistry of iron in aquatic environments

Light-induced reduction of Fe(III) delivers Fe(II) as nutrient or substrate for growth of planktonic or sedimentary organisms. Biological uptake, as well as chemical or microbial oxidation of Fe(II) close this photochemically driven iron cycle.

Graphical abstract: Photochemistry of iron in aquatic environments
From the themed collection: Geochemistry
Critical Review

Mechanism and applications of bidirectional extracellular electron transfer of Shewanella

Electrochemically active microorganisms (EAMs) play an important role in the fields of environment and energy.

Graphical abstract: Mechanism and applications of bidirectional extracellular electron transfer of Shewanella
From the themed collection: Geochemistry
Critical Review

Mercury pollution in China: implications on the implementation of the Minamata Convention

This paper summarizes the atmospheric release of Hg, distribution of air Hg concentration, human exposure to MeHg and health impacts caused by Hg pollution in China.

Graphical abstract: Mercury pollution in China: implications on the implementation of the Minamata Convention
From the themed collection: Geochemistry
Critical Review

Environmental geochemistry of thioantimony: formation, structure and transformation as compared with thioarsenic

The review presents a way of comparing environmental geochemistry between thioantimony and thioarsenic, summarizing the latest knowledge about their formation, structure and transformation.

Graphical abstract: Environmental geochemistry of thioantimony: formation, structure and transformation as compared with thioarsenic
From the themed collection: Geochemistry
Critical Review

Emerging investigator series: critical review of photophysical models for the optical and photochemical properties of dissolved organic matter

Photophysical models for dissolved organic matter optical properties and photochemistry are critically reviewed.

Graphical abstract: Emerging investigator series: critical review of photophysical models for the optical and photochemical properties of dissolved organic matter
From the themed collection: Geochemistry
Critical Review

Cross-ecosystem nutrient subsidies in Arctic and alpine lakes: implications of global change for remote lakes

Environmental change is continuing to affect the flow of nutrients, material and organisms across ecosystem boundaries. In this review, we synthesize current knowledge of cross-ecosystem nutrient subsidies between Arctic and alpine lakes and their surrounding terrain, cryosphere, and atmosphere.

Graphical abstract: Cross-ecosystem nutrient subsidies in Arctic and alpine lakes: implications of global change for remote lakes
From the themed collection: Geochemistry
Critical Review

Positive matrix factorization on source apportionment for typical pollutants in different environmental media: a review

A bibliometric analysis of published papers with the key words “positive matrix factorization” and “source apportionment” in ‘Web of Science’, reveals that more than 1000 papers are associated with this research and that approximately 50% of these were produced in Asia.

Graphical abstract: Positive matrix factorization on source apportionment for typical pollutants in different environmental media: a review
From the themed collection: Geochemistry
Communication

Unexpectedly high dimethyl sulfide concentration in high-latitude Arctic sea ice melt ponds

Dimethyl sulfide (DMS) production in the northern Arctic Ocean has been considered to be minimal because of high sea ice concentration and extremely low productivity.

Graphical abstract: Unexpectedly high dimethyl sulfide concentration in high-latitude Arctic sea ice melt ponds
From the themed collection: Geochemistry
Paper

Emerging investigator series: impacts of land use on dissolved organic matter quality in agricultural watersheds: a molecular perspective

In aquatic systems, dissolved organic matter (DOM) has important ecological and biogeochemical functions, where the molecular composition of DOM has larger-scale implications for climate change and global carbon cycles.

Graphical abstract: Emerging investigator series: impacts of land use on dissolved organic matter quality in agricultural watersheds: a molecular perspective
From the themed collection: Geochemistry
Paper

Effects of carbonate on ferrihydrite transformation in alkaline media

This study indicates that in alkaline media, carbonate slightly inhibits ferrihydrite transformation and suppresses goethite formation, but promotes hematite formation, which has important implications for elemental biogeochemical cycles.

Graphical abstract: Effects of carbonate on ferrihydrite transformation in alkaline media
Open Access Paper

Contrasted redox-dependent structural control on Fe isotope fractionation during its adsorption onto and assimilation by heterotrophic soil bacteria

Despite the importance of structural control on metal stable isotope fractionation in inorganic and abiotic systems, the link between metal structural changes and related isotopic fractionation during reactions with organic surfaces and live cells remains poorly established.

Graphical abstract: Contrasted redox-dependent structural control on Fe isotope fractionation during its adsorption onto and assimilation by heterotrophic soil bacteria
From the themed collection: Recent Open Access Articles
Open Access Paper

Atmospheric mercury uptake and accumulation in forests dependent on climatic factors

The uptake of total gaseous mercury (TGM) by Korean forest foliage is mainly affected by local wind speed, boosting its passage and absorption. Mercury levels and isotopic signatures in litter and topsoil fluctuate, particularly in areas with high wind speed, temperature, and low elevation.

Graphical abstract: Atmospheric mercury uptake and accumulation in forests dependent on climatic factors
From the themed collection: Geochemistry
Paper

Elevated levels of environmental radioactivity in fluvial sediment: origin and health risk assessment

To study the geogenic processes of naturally occurring radioactive materials' distribution, a transboundary Himalayan river (Punarbhaba) is chosen due to its trivial anthropogenic impacts.

Graphical abstract: Elevated levels of environmental radioactivity in fluvial sediment: origin and health risk assessment
From the themed collection: Geochemistry
Paper

How do certain atmospheric aerosols affect Cu-binding organic ligands in the oligotrophic coastal sea surface microlayer?

We showed that oligotrophic coastal marine areas are susceptible to the deposition of pollen and aerosols from open-fire biomass burning, which alter Cu-binding organic ligands in the sea surface microlayer.

Graphical abstract: How do certain atmospheric aerosols affect Cu-binding organic ligands in the oligotrophic coastal sea surface microlayer?
Open Access Paper

Contact with soil impacts ferrihydrite and lepidocrocite transformations during redox cycling in a paddy soil

We studied the transformation of 57Fe-labelled ferrihydrite and lepidocrocite mixed with a flooded paddy soil by using 57Fe-Mössbauer spectroscopy.

Graphical abstract: Contact with soil impacts ferrihydrite and lepidocrocite transformations during redox cycling in a paddy soil
Paper

Evaluating the pH-dependence of DOM absorbance, fluorescence, and photochemical production of singlet oxygen

The protonation state of dissolved organic matter (DOM) impacts its structure and function in natural and engineered environmental systems, including DOM's ability to absorb light and form photochemically produced reactive intermediates (PPRI).

Graphical abstract: Evaluating the pH-dependence of DOM absorbance, fluorescence, and photochemical production of singlet oxygen
Paper

Resistance profiles of microbial communities in maize rhizospheres to the introduction of exogenous antibiotics to agricultural systems with a high arsenic geological background

The soil environment in regions with a high arsenic geological background may have enabled microbial adaptation, through co-selection mechanisms, to withstand the introduction of exogenous antibiotics.

Graphical abstract: Resistance profiles of microbial communities in maize rhizospheres to the introduction of exogenous antibiotics to agricultural systems with a high arsenic geological background
From the themed collection: Geochemistry
Paper

Prehistoric and technogenic loads of Hg in raised and blanket peats from the lower Amur River basin, eastern Asia

Prehistoric and modern records of Hg in peats from the lower Amur River basin, eastern Asia, were investigated.

Graphical abstract: Prehistoric and technogenic loads of Hg in raised and blanket peats from the lower Amur River basin, eastern Asia
From the themed collection: Geochemistry
Open Access Paper

Ferrihydrite coating reduces microplastic induced soil water repellency

Addition of microplastics (MP) to soil has the potential to increase soil water repellency. Absorption of soil abundant substances on MP surfaces has the potential to overcome MP inherent hydrophobicity.

Graphical abstract: Ferrihydrite coating reduces microplastic induced soil water repellency
From the themed collection: Recent Open Access Articles
Paper

Biogeochemical and hydrologic synergy control mercury fate in an arid land river-reservoir system

Methylmercury formed in anoxic reservoirs associates with organic-rich particles and is exported downstream.

Graphical abstract: Biogeochemical and hydrologic synergy control mercury fate in an arid land river-reservoir system
Paper

Indexical and statistical approaches to investigate the integrated origins of elements in the sediment of Teesta River, Bangladesh: sediment quality and ecological risk assessment

This study investigates ecological consequences from the combined provenance (natural and manmade) of fifteen metal(oid)s (Na, Al, K, Ti, Cr, Mn, Co, Zn, As, Rb, Sb, Cs, Ba, Th, and U) from a major Indo-Bangla transboundary river (Teesta).

Graphical abstract: Indexical and statistical approaches to investigate the integrated origins of elements in the sediment of Teesta River, Bangladesh: sediment quality and ecological risk assessment
From the themed collection: Geochemistry
Open Access Paper

Arsenic in Lake Geneva (Switzerland, France): long term monitoring, and redox and methylation speciation in an As unpolluted, oligo-mesotrophic lake

The formation and dynamic partitioning of As species in the water column of a large oligo-mesotrophic lake is driven by biological processes.

Graphical abstract: Arsenic in Lake Geneva (Switzerland, France): long term monitoring, and redox and methylation speciation in an As unpolluted, oligo-mesotrophic lake
From the themed collection: Recent Open Access Articles
Paper

Fate and recovery of nitrogen applied as slow release brown coal-urea in field microcosms: 15N tracer study

The over-use of synthetic nitrogen (N) fertilisers for crop production can cause environmental pollution through leaching and gaseous losses, resulting in low N use efficiency (NUE).

Graphical abstract: Fate and recovery of nitrogen applied as slow release brown coal-urea in field microcosms: 15N tracer study
From the themed collection: Geochemistry
Paper

Laboratory growth capacity of an invasive cyanobacterium (Microcystis aeruginosa) on organic substrates from surface waters of permafrost peatlands

Under global warming, invasive cyanobacteria, can migrate northward and colonize lakes in permafrost-affected territories. This study tests the potential growth of M. aeruginosa onto various organic-rich solutions of those regions.

Graphical abstract: Laboratory growth capacity of an invasive cyanobacterium (Microcystis aeruginosa) on organic substrates from surface waters of permafrost peatlands
From the themed collection: Geochemistry
Paper

Crystal lattice defects in nanocrystalline metacinnabar in contaminated streambank soils suggest a role for biogenic sulfides in the formation of mercury sulfide phases

At mercury (Hg)-contaminated sites, streambank erosion can act as a main mobilizer of Hg into nearby waterbodies.

Graphical abstract: Crystal lattice defects in nanocrystalline metacinnabar in contaminated streambank soils suggest a role for biogenic sulfides in the formation of mercury sulfide phases
Paper

Dissolution of Mn-bearing dolomite drives elevated Cr(VI) occurrence in a Permian redbed aquifer

Cr(III) oxidation and Cr(VI) occurrence corresponds to regions of cation-exchange induced Mn-carbonate dissolution.

Graphical abstract: Dissolution of Mn-bearing dolomite drives elevated Cr(vi) occurrence in a Permian redbed aquifer
From the themed collection: Geochemistry
Paper

Sorption–desorption of some transition metals, boron and sulphur in a multi-ionic system onto phyto-biochars prepared at two pyrolysis temperatures

Batch sorption–desorption of Zn, Cu, Fe, Mn, B and S onto phyto-biochars prepared from lantana, pine needles and wheat straw by pyrolysis at 300 °C and 450 °C were studied in a multi-ionic system.

Graphical abstract: Sorption–desorption of some transition metals, boron and sulphur in a multi-ionic system onto phyto-biochars prepared at two pyrolysis temperatures
From the themed collection: Geochemistry
Paper

Controls on the photochemical production of hydrogen peroxide in Lake Erie

Photochemical production of hydrogen peroxide (H2O2) may not the dominant source of H2O2 in Lake Erie, where toxin-forming harmful algal blooms follow high concentrations of H2O2.

Graphical abstract: Controls on the photochemical production of hydrogen peroxide in Lake Erie
From the themed collection: Geochemistry
Open Access Paper

Ferrihydrite transformations in flooded paddy soils: rates, pathways, and product spatial distributions

The rate and pathway of ferrihydrite transformation in soil depends on the properties of the soil pore water and diffusion processes.

Graphical abstract: Ferrihydrite transformations in flooded paddy soils: rates, pathways, and product spatial distributions
From the themed collection: Recent Open Access Articles
Paper

Changes in light absorption and composition of chromophoric marine-dissolved organic matter across a microbial bloom

Marine chromophoric dissolved organic matter (m-CDOM) mediates many vital photochemical processes in the surface ocean.

Graphical abstract: Changes in light absorption and composition of chromophoric marine-dissolved organic matter across a microbial bloom
From the themed collection: Geochemistry
Open Access Paper

Heteroaggregation of PS microplastic with ferrihydrite leads to rapid removal of microplastic particles from the water column

Heteroaggregation of microplastic and ferrihydrite leads to sedimentation and therefore removal of microplastic from the water column.

Graphical abstract: Heteroaggregation of PS microplastic with ferrihydrite leads to rapid removal of microplastic particles from the water column
From the themed collection: Recent Open Access Articles
Paper

Impact of beaver ponds on biogeochemistry of organic carbon and nitrogen along a fire-impacted stream

Beaver ponds act as biological "hotspots" with unique geochemistry and microbiomes in fire-impacted systems.

Graphical abstract: Impact of beaver ponds on biogeochemistry of organic carbon and nitrogen along a fire-impacted stream
From the themed collection: Geochemistry
Paper

Influence of microorganisms on uranium release from mining-impacted lake sediments under various oxygenation conditions

Microbial processes can be involved in the remobilization of uranium (U) from reduced sediments under O2 reoxidation events such as water table fluctuations.

Graphical abstract: Influence of microorganisms on uranium release from mining-impacted lake sediments under various oxygenation conditions
From the themed collection: Geochemistry
Open Access Paper

Effects of aluminum incorporation on the schwertmannite structure and surface properties

Aluminum in schwertmannite structure increases the proportion of covalent bonding with adsorbed arsenates.

Graphical abstract: Effects of aluminum incorporation on the schwertmannite structure and surface properties
From the themed collection: Geochemistry
Open Access Paper

Hydrobiogechemical interactions in the hyporheic zone of a sulfate-impacted, freshwater stream and riparian wetland ecosystem

Biogeochemical cycling of S, Fe, and C in the hyporheic zone is influenced by dynamic hydrologic conditions.

Graphical abstract: Hydrobiogechemical interactions in the hyporheic zone of a sulfate-impacted, freshwater stream and riparian wetland ecosystem
From the themed collection: Recent Open Access Articles
Open Access Paper

Thallium adsorption onto phyllosilicate minerals

We studied the extent and mode of thallium adsorption onto several phyllosilicate minerals. Thallium, in analogy to cesium, strongly adsorbs onto micaceous phyllosilicates in soils and sediments via complexation in siloxane cavities.

Graphical abstract: Thallium adsorption onto phyllosilicate minerals
From the themed collection: Recent Open Access Articles
Paper

Response of sediment phosphorus partitioning to lanthanum-modified clay amendment and porewater chemistry in a small eutrophic lake

Porewater geochemistry in a lanthanum-remediated lake reveal that phosphorus mobility depends on the interplay between carbon and iron.

Graphical abstract: Response of sediment phosphorus partitioning to lanthanum-modified clay amendment and porewater chemistry in a small eutrophic lake
From the themed collection: Geochemistry
Open Access Paper

Two decades of changing anthropogenic mercury emissions in Australia: inventory development, trends, and atmospheric implications

Australian anthropogenic emissions of mercury have decreased by a factor of two since 2000, with implications for atmospheric mercury concentrations and deposition to the Australian continent.

Graphical abstract: Two decades of changing anthropogenic mercury emissions in Australia: inventory development, trends, and atmospheric implications
From the themed collection: Geochemistry
Paper

Relationship between surface dissolved iron inventories and net community production during a marine heatwave in the subarctic northeast Pacific

Marine heatwave conditions diminished (micro)macronutrient vertical transport, reducing (micro)macronutrient inventories and net community production when external nutrient sources were absent.

Graphical abstract: Relationship between surface dissolved iron inventories and net community production during a marine heatwave in the subarctic northeast Pacific
From the themed collection: Geochemistry
Paper

Impact of abiotic and biogeochemical processes on halogen concentrations (Cl, Br, F, I) in mineral soil along a climatic gradient

Halogens in soil are closely linked to abiotic processes, biota and pedogenesis, and thus to the availability of water; vertical halogen depth patterns become less pronounced with increasing dryness.

Graphical abstract: Impact of abiotic and biogeochemical processes on halogen concentrations (Cl, Br, F, I) in mineral soil along a climatic gradient
From the themed collection: Geochemistry
Paper

Organic carbon, and major and trace elements reside in labile low-molecular form in the ground ice of permafrost peatlands: a case study of colloids in peat ice of Western Siberia

The low molecular weight fraction of peat porewater is enriched in DOC, anions, oxyanions, alkalis and some trace metals. An increase in the active layer depth can liberate a large amount of labile metals and nutrients from the peat.

Graphical abstract: Organic carbon, and major and trace elements reside in labile low-molecular form in the ground ice of permafrost peatlands: a case study of colloids in peat ice of Western Siberia
From the themed collection: Geochemistry
Paper

Selenium distribution and speciation in waters of pristine alpine lakes from central-western Pyrenees (France–Spain)

The distribution and chemical speciation of micronutrient selenium is reported for the first time in twenty alpine lakes (Pyrenees, France–Spain).

Graphical abstract: Selenium distribution and speciation in waters of pristine alpine lakes from central-western Pyrenees (France–Spain)
From the themed collection: Geochemistry
Open Access Paper

Demystifying mercury geochemistry in contaminated soil–groundwater systems with complementary mercury stable isotope, concentration, and speciation analyses

A holistic multi-analyses (led by Hg stable isotope analysis), multi-media, multi-site approach to improving contaminated site Hg geochemistry, particularly process tracing.

Graphical abstract: Demystifying mercury geochemistry in contaminated soil–groundwater systems with complementary mercury stable isotope, concentration, and speciation analyses
From the themed collection: Recent Open Access Articles
Paper

Incorporating concentration-dependent sediment microbial activity into methylmercury production kinetics modeling

Including concentration-dependent microbial activity may improve model description of mercury methylation and methylmercury demethylation kinetics.

Graphical abstract: Incorporating concentration-dependent sediment microbial activity into methylmercury production kinetics modeling
From the themed collection: Geochemistry
Paper

Direct observation of humic acid-promoted hydrolysis of phytate through stabilizing a conserved catalytic domain in phytase

HA promotes enzymatic hydrolysis of phytate as shown by the increase in nucleation of Pi-bearing particles, which is achieved by conformation change to stabilize a catalytic domain resulting from noncovalent phytase–HA interaction.

Graphical abstract: Direct observation of humic acid-promoted hydrolysis of phytate through stabilizing a conserved catalytic domain in phytase
From the themed collection: Geochemistry
Paper

Metal (hydr)oxide surface precipitates and their effects on potassium sorption

Surface precipitation has been shown to occur on rapid time scales in clay and metal oxide mineral systems.

Graphical abstract: Metal (hydr)oxide surface precipitates and their effects on potassium sorption
Paper

Identification of chlorpyrifos-degrading microorganisms in farmland soils via cultivation-independent and -dependent approaches

This study shows a feasible cultivation-independent method by MMI coupled with high-throughput sequencing to identify in situ microbes actively, various microbes were recognized for the first time, the OPH genes were involved in CPF metabolism.

Graphical abstract: Identification of chlorpyrifos-degrading microorganisms in farmland soils via cultivation-independent and -dependent approaches
From the themed collection: Geochemistry
Paper

Quantifying the impacts of non-carbonic acid (NCA) stress on dissolved inorganic carbon (DIC) generation in the granitic-hosted watershed, Huangshan UNESCO Global Geopark, China

DIC generation in carbonate dissolution in acidic granitic-soil is promoted by H2SO4, perturbed by HNO3, little affected by organic acids.

Graphical abstract: Quantifying the impacts of non-carbonic acid (NCA) stress on dissolved inorganic carbon (DIC) generation in the granitic-hosted watershed, Huangshan UNESCO Global Geopark, China
From the themed collection: Geochemistry
Open Access Paper

Implications of sample treatment on characterization of riverine dissolved organic matter

We compared how FTICR-MS characterization of riverine dissolved organic matter varied across four sample pre-treatment and instrument ionization methods to provide guidelines for future researchers utilizing FTICR-MS in environmental analyses.

Graphical abstract: Implications of sample treatment on characterization of riverine dissolved organic matter
From the themed collection: Recent Open Access Articles
Paper

Spatial distribution and biogeochemistry of redox active species in arctic sedimentary porewaters and seeps

Schematic showing how voltammetric microelectrodes were used to profile arctic lake sediments, where different locations contained different distributions of redox-active species.

Graphical abstract: Spatial distribution and biogeochemistry of redox active species in arctic sedimentary porewaters and seeps
Paper

Controls on the epilimnetic phosphorus concentration in small temperate lakes

Lake morphometric, chemical, and watershed land-use attributes control lake phosphorus concentration. Lake depth, sediment chemical makeup, DOC, and watershed agricultural extent are the most important controlling variables.

Graphical abstract: Controls on the epilimnetic phosphorus concentration in small temperate lakes
From the themed collection: Geochemistry
Paper

Assessing the source of the photochemical formation of hydroxylating species from dissolved organic matter using model sensitizers

Dissolved organic matter (DOM) can facilitate the transformation of contaminants through the production of reactive intermediates, such as singlet oxygen (1O2), and hydroxylating species (˙OH and other intermediates of similar reaction chemistry).

Graphical abstract: Assessing the source of the photochemical formation of hydroxylating species from dissolved organic matter using model sensitizers
From the themed collection: Geochemistry
Paper

Polycyclic aromatic hydrocarbon occurrence in forest soils in response to fires: a summary across sites

Forest fires are important sources of polycyclic aromatic hydrocarbons (PAHs) in soils.

Graphical abstract: Polycyclic aromatic hydrocarbon occurrence in forest soils in response to fires: a summary across sites
From the themed collection: Geochemistry
Paper

Distinguishing atmospheric nitrogen compounds (nitrate and ammonium) in lichen biomonitoring studies

Nitrogen speciation (NO3 and NH4+) method from lichen material, using 0.05 g lichen, 3 mL of 3% KCl and 6 hours extraction.

Graphical abstract: Distinguishing atmospheric nitrogen compounds (nitrate and ammonium) in lichen biomonitoring studies
From the themed collection: Geochemistry
Paper

Biological calcium carbonate with a unique organic–inorganic composite structure to enhance biochar stability

The inorganic components in Bio-CaCO3 catalyze the deoxygenation of biochar and increase the degree of aromatization of the carbon matrix. The stable pyridinic-N structures are doped into the carbon skeleton, which further improves the stability of biochar.

Graphical abstract: Biological calcium carbonate with a unique organic–inorganic composite structure to enhance biochar stability
From the themed collection: Geochemistry
Paper

Identifying sources of groundwater salinity and major hydrogeochemical processes in the Lower Kabul Basin aquifer, Afghanistan

The origin of groundwater salinity and major hydrogeochemical processes in the LKB aquifer were investigated using hydrogeochemical and HCA methods. The results indicate that evaporitic lacustrine deposits are the major source of salinity in the aquifer.

Graphical abstract: Identifying sources of groundwater salinity and major hydrogeochemical processes in the Lower Kabul Basin aquifer, Afghanistan
From the themed collection: Geochemistry
Open Access Paper

Interannual, summer, and diel variability of CH4 and CO2 effluxes from Toolik Lake, Alaska, during the ice-free periods 2010–2015

CH4 and CO2 fluxes from Toolik Lake obtained for the first time with eddy covariance during ice-free periods 2010–2015.

Graphical abstract: Interannual, summer, and diel variability of CH4 and CO2 effluxes from Toolik Lake, Alaska, during the ice-free periods 2010–2015
From the themed collection: Geochemistry
Paper

Microbial genetic potential for xenobiotic metabolism increases with depth during biofiltration

Microbial genetic potential for the biotransformation of xenobiotics and antibiotic resistance increases with depth during biofiltration.

Graphical abstract: Microbial genetic potential for xenobiotic metabolism increases with depth during biofiltration
From the themed collection: Geochemistry
Paper

Anaerobic respiration pathways and response to increased substrate availability of Arctic wetland soils

Divergent soil biogeochemical conditions will determine the fate and pathways of labile carbon released during permafrost thaw, thereby influencing the production of greenhouse gas mixtures and radiative forcing of tundra soils.

Graphical abstract: Anaerobic respiration pathways and response to increased substrate availability of Arctic wetland soils
From the themed collection: Geochemistry
Open Access Paper

Surface precipitation of Mn2+ on clay minerals enhances Cd2+ sorption under anoxic conditions

Under anoxic conditions, clay minerals sorb dissolved Mn(II) predominantly by forming surface precipitates, which increase Cd sorption.

Graphical abstract: Surface precipitation of Mn2+ on clay minerals enhances Cd2+ sorption under anoxic conditions
From the themed collection: Geochemistry
Paper

Physico-chemical factors controlling the speciation of phosphorus in English and Welsh rivers

Phosphorus cycling in the environment.

Graphical abstract: Physico-chemical factors controlling the speciation of phosphorus in English and Welsh rivers
From the themed collection: Geochemistry
Open Access Paper

Composition and photo-reactivity of organic matter from permafrost soils and surface waters in interior Alaska

Yedoma permafrost soils are especially susceptible to abrupt thaw due to their exceptional thickness and high ice content.

Graphical abstract: Composition and photo-reactivity of organic matter from permafrost soils and surface waters in interior Alaska
From the themed collection: Geochemistry
Paper

Iron and iron-bound phosphate accumulate in surface soils of ice-wedge polygons in arctic tundra

Iron accumulation in shallow tundra soils promotes adsorption of phosphate from soil solution, sequestering high concentrations of potentially bioavailable phosphorus.

Graphical abstract: Iron and iron-bound phosphate accumulate in surface soils of ice-wedge polygons in arctic tundra
From the themed collection: Geochemistry
Open Access Paper

Interactions of ferrous iron with clay mineral surfaces during sorption and subsequent oxidation

Under anoxic conditions, clay minerals sorb dissolved Fe(II) predominantly by forming surface precipitates, which transform into Fe(III)-phases upon aeration.

Graphical abstract: Interactions of ferrous iron with clay mineral surfaces during sorption and subsequent oxidation
From the themed collection: Geochemistry
Open Access Paper

Assessing the prevalence, products, and pathways of dissolved organic matter partial photo-oxidation in arctic surface waters

Isotope tracer experiments reveal that rates of dissolved organic matter partial photochemical oxidation are considerably underestimated in arctic surface waters.

Graphical abstract: Assessing the prevalence, products, and pathways of dissolved organic matter partial photo-oxidation in arctic surface waters
From the themed collection: Geochemistry
Open Access Paper

Quantitative measures of myo-IP6 in soil using solution 31P NMR spectroscopy and spectral deconvolution fitting including a broad signal

Inositol phosphates, particularly myo-inositol hexakisphosphate (myo-IP6), are an important pool of soil organic phosphorus (P) in terrestrial ecosystems.

Graphical abstract: Quantitative measures of myo-IP6 in soil using solution 31P NMR spectroscopy and spectral deconvolution fitting including a broad signal
From the themed collection: Geochemistry
78 items - Showing page 1 of 2

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This web collection features research articles published in Environmental Science: Processes & Impacts focussed on geochemistry and biogeochemistry.

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