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Themed collection Geochemistry

25 items
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
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
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
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
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
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
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
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: Cryosphere Chemistry
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: Recent Open Access Articles
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: Cryosphere Chemistry
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: Recent Open Access Articles
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: Recent Open Access Articles
Paper

Use of optical properties for evaluating the presence of pyrogenic organic matter in thermally altered soil leachates

Optical measurements reveal the presence of pyrogenic organic matter in laboratory heated soil leachates, indicating their potential for application in field measurements.

Graphical abstract: Use of optical properties for evaluating the presence of pyrogenic organic matter in thermally altered soil leachates
From the themed collection: Geochemistry
Paper

Impact of bromide exposure on natural organochlorine loss from coastal wetland soils in the Winyah Bay, South Carolina

Naturally formed halogenated organic compounds are common in terrestrial and marine environments and play an important role in the halogen cycle.

Graphical abstract: Impact of bromide exposure on natural organochlorine loss from coastal wetland soils in the Winyah Bay, South Carolina
Paper

Sources and sinks of chloromethane in a salt marsh ecosystem: constraints from concentration and stable isotope measurements of laboratory incubation experiments

Chloromethane (CH3Cl) is the most abundant long-lived chlorinated organic compound in the atmosphere and contributes significantly to natural stratospheric ozone depletion.

Graphical abstract: Sources and sinks of chloromethane in a salt marsh ecosystem: constraints from concentration and stable isotope measurements of laboratory incubation experiments
Paper

How did the bacterial community respond to the level of urbanization along the Yangtze River?

The response of bacteria communities to the urbanization level.

Graphical abstract: How did the bacterial community respond to the level of urbanization along the Yangtze River?
From the themed collection: Geochemistry
Paper

Emerging investigator series: mercury mobility and methylmercury formation in a contaminated agricultural flood plain: influence of flooding and manure addition

We investigated the release of mercury from soil to soil solution and the formation of methylmercury in polluted agricultural floodplain fields during a flooding incubation experiment.

Graphical abstract: Emerging investigator series: mercury mobility and methylmercury formation in a contaminated agricultural flood plain: influence of flooding and manure addition
From the themed collection: Geochemistry
Paper

Plant rhizosphere, soil microenvironment, and functional genes in the nitrogen removal process of bioretention

The coupling effect of plant, soil, and microbes in bioretention provides conditions conductive for nitrogen (N) removal via nitrification, accretion, denitrification, and dissimilatory nitrate reduction to ammonium (DNRA).

Graphical abstract: Plant rhizosphere, soil microenvironment, and functional genes in the nitrogen removal process of bioretention
From the themed collection: Geochemistry
Paper

Potential impacts of anthropogenic nutrient enrichment on coral reefs in the South China Sea: evidence from nutrient and chlorophyll a levels in seawater

Anthropogenic nutrient enrichment caused macroalgal blooms and further resulted in coral reef degradation in coastal and some remote reef areas of the SCS.

Graphical abstract: Potential impacts of anthropogenic nutrient enrichment on coral reefs in the South China Sea: evidence from nutrient and chlorophyll a levels in seawater
From the themed collection: Geochemistry
Paper

Assessing thermodynamic parameter sensitivity for simulating temperature responses of soil nitrification

The sensitivity of SQRT model-estimated parameters varied over a temperature gradient whereas no variation in MMRT model-estimated parameters, in simulating temperature responses of soil nitrification over the temperature range, was observed.

Graphical abstract: Assessing thermodynamic parameter sensitivity for simulating temperature responses of soil nitrification
From the themed collection: Geochemistry
25 items

About this collection

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

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