Themed collection Geochemistry
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Physico-chemical factors controlling the speciation of phosphorus in English and Welsh rivers
Phosphorus cycling in the environment.
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.
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.
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.
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.
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.
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.
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.
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.
How did the bacterial community respond to the level of urbanization along the Yangtze River?
The response of bacteria communities to the urbanization level.
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.
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).
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.
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.
About this collection
This web collection features research articles published in Environmental Science: Processes & Impacts focussed on geochemistry and biogeochemistry.