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Courses
- ASWCAdvanced Soil and Water Chemistry
- MBMolecular Biogeochemistry
- ESWCEnvironmental Soil and Water Chemistry
Grants
- Collaborative Research: Concentration - Ratio - Discharge (C-R-Q) Relationships of Transient Water-Age Distributions
Principal Investigator (PI)
2022
$466.5K
Active - Collaborative Research: GCR: Growing a New Science of Landscape Terraformation: The Convergence of Rock, Fluids, and Life to form Complex Ecosystems Across Scales
Co-Investigator (COI)
2021
$1.2M
Active - In-Situ Sequestration of PFAS from Contaminated Groundwater using Injectable High Affinity Cationic Hydrophobic
Principal Investigator (PI)
2021
$250.0K
Active - Exposures, Health Impacts, and Risk for Mine Waste Contamination
Multiple Principal Investigator (MPI)
2020
$8.9M
Active - Collaborative Research: Network Cluster: Geomicrobiology and Biogeochemistry in the Critical Zone
Co-Investigator (COI)
2020
$407.3K
Active - Collaborative Research: Network Cluster: Using Big Data Approaches to Assess Ecohydrological Resilience Across Scales
Principal Investigator (PI)
2020
$216.3K
Active - Analysis of Groundwater Flow and Uranium Sorption Properties of Tnbs1/Tnbs0 Bedrock Core From The Lawrence Livermore National Laboratory Site 300 Building 812 Area
Co-Investigator (COI)
2020
$70.0K
Active - High Rate Degradation of 3-Nitro-1,2,4-triazol-5-one (NTO) to Environmentally Benign End Products in Sequential Reducing-Oxidizing Reactive Mineral Packed Bed Reactors
Co-Investigator (COI)
2019
$678.6K
Active - Southwest Environmental Health Sciences Center
Co-Investigator (COI)
2018
$7.3M
Active - Central Date Palm Laboratory Project
Principal Investigator (PI)
2018
$3.9M
Active
Technologies / Patents
News
- Microbes are 'active engineers' in Earth's rock-to-life cycle
2023
- Valley Fever Collaborative awarded $3.1M in research funds
2022
- Life on LEO: Plants to be Added to the Landscape Evolution Observatory at Biosphere 2
2021
- Superfund Research Center Receives $10.6M to Study Mining Waste, Arsenic-Diabetes Link
2020
- UA Engineers Use $1.2M Grant to Make Drinking Water Safer
2019
- Environmental Impact: Rendering Toxic Explosives Harmless
2019
- Tech On Tap: UA Inventors Address World Water Woes
2019
- UA-Led $3.9M Project to Focus on Date Palm Production in Oman
2018
- EarthWeek 2016 to Feature Student Research
2016
- UA Researchers Hunt Bomb-Eating Bugs
2012
- UA Tests Consumer Water Filters for Contaminant Removal
2012
- Water Contaminant Expert Joins UA Engineering Research Team
2010
- How Microbes Eat Rocks
2010
- New Emerging Contaminants Lab Holds Open House Jan. 21
2009
- Shelton Joins House Speaker, Scientists to Launch 'ScienceWorksForUS'
2009
- UA Awarded $4.35M to Study Earth's Critical Zone
2009
- More Than $81M in Stimulus Funding Awarded to UA for 122 Research Projects, Creating or Preserving the Equivalent of 157 Jobs
2009
- President Shelton's State of the University Address
2009
- Former Biospherian to Speak at Biosphere 2 March 8
2008
- Biosphere 2 Offers Special Events for Saturday Visitors
2008
- The University of Arizona Launches Major Scientific Research Initiative at Biosphere 2
2007
- Grant to UA Makes Kartchner Caverns a Microbial Observatory
2006
- Caustic Soils at Hanford May Lock Up Contaminants Fast
2004
Publications (207)
- Experimental weathering of a volcaniclastic critical zone profile: Key role of colloidal constituents in aqueous geochemical response
2021
- Bioconcentration potential and microbial toxicity of onium cations in photoacid generators
2021
- Resolving deep critical zone architecture in complex volcanic terrain
2020
- Life teems below the surface
2020
- Dissolved Carbonate and pH Control the Dissolution of Uranyl Phosphate Minerals in Flow-Through Porous Media
2020
- Vegetation source water identification using isotopic and hydrometric observations from a subhumid mountain catchment
2020
- Arsenic and iron speciation and mobilization during phytostabilization of pyritic mine tailings
2020
- Reactive transport modeling of basalt weathering and early soil formation within a highly-controlled, sloping lysimeter
2020
- Strong slope-aspect control of regolith thickness by bedrock foliation
2020
- Depth and topographic controls on microbial activity in a recently burned sub-alpine catchment
2020
- Ubiquitous fractal scaling and filtering behavior of hydrologic fluxes and storages from a mountain headwater catchment
2020
- Soil organic carbon stability in forests: Distinct effects of tree species identity and traits
2019
- Surficial weathering of kaolin regolith in a subtropical climate: Implications for supergene pedogenesis and bedrock argillization
2019
- Assessing Microbial Community Patterns During Incipient Soil Formation From Basalt
2019
- Rare earth elements (REY) sorption on soils of contrasting mineralogy and texture
2019
- Effect of re-acidification on Buffalo Grass rhizosphere and bulk microbial communities during phytostabilization of metalliferous mine tailings
2019
- From rock to life. A mass balance analysis of oxidative biological weathering and biosignature formation
2019
- Soil microbiome dynamics during pyritic mine tailing phytostabilization: Understanding microbial bioindicators of soil acidification
2019
- Microtopography-mediated hydrologic environment controls elemental migration and mineral weathering in subalpine surface soils of subtropical monsoonal China
2019
- Adsorption and oxidation of 3-nitro-1,2,4-triazole-5-one (NTO) and its transformation product (3-amino-1,2,4-triazole-5-one, ATO) at ferrihydrite and birnessite surfaces
2018
- Abiotic reducton of insensitive munition compounds by sulfate green rust
2018
- Mechanisms of arsenic sequestration by Prosopis juliflora during the phytostabilization of metalliferous mine tailings
2018
- Uranium speciation in acid waste-weathered sediments: The role of aging and phosphate amendments
2018
- Trace element mobilization during incipient bioweathering of four rock types
2018
- Oxidation of reduced daughter products from 2,4-dinitroanisole (DNAN) by Mn(IV) and Fe(III) oxides
2018
- Ecotoxicity of the insensitive munitions compound 3-nitro-1,2,4-triazol-5-one (NTO) and its reduced metabolite 3-amino-1,2,4-triazol-5-one (ATO)
2018
- Subsurface pore water contributions to stream concentration-discharge relations across a snowmelt hydrograph
2018
- Trapping of lead (Pb) by corn and pea root border cells
2018
- Understanding critical zone evolution through predicting the three-dimensional soil chemical properties of a small forested catchment.
2018
- Treatment impacts on temporal microbial community dynamics during phytostabilization of acid-generating mine tailings in semiarid regions
2018
- Wet-dry cycles impact DOM retention in subsurface soils
2018
- A considerable fraction of soil-respired Co2 is not emitted directly to the atmosphere
2018
- Bacterial rhizoplane colonization patterns of Buchloe dactyloides growing in metalliferous mine tailings reflect plant status and biogeochemical conditions
2017
- Biogeochemical control points in a water‐limited critical zone
2017
- Environmental fate of C-14 radiolabeled 2,4-dinitroanisole in soil microcosms.
2017
- Sequential anaerobic-aerobic biodegradation of emerging insensitive munitions compound 3-nitro-1,2,4-triazol-5-one (NTO).
2017
- Concentration-discharge relations in the critical zone: Implications for resolving critical zone structure, function and evolution.
2017
- Geochemical evolution of the critical zone across variable time scales informs concentration-discharge relationships: Jemez River Basin Critical Zone Observatory
2017
- Hydrologic functioning of the deep Critical Zone and contributions to streamflow in a high elevation catchment: testing of multiple conceptual models
2017
- Changing Water, Carbon and Energy Fluxes Alters Deep CZ Structure and Solute Exports to Streams
2017
- Hydrologic and environmental controls on uranium‐series and strontium isotope ratios in a natural weathering environment
2017
- Evolution of concentration‐discharge relations revealed by high frequency diurnal sampling of stream water during spring snowmelt
2017
- Uranium release from acidic weathered sediments: Single-pass flow-through and column experiments
2017
- Ecosystem composition controls the fate of rare earth elements during incipient soil genesis
2017
- Hydrologic and Environmental Controls on Uranium-Series Isotopes in a Natural Volcanic Weathering Environment
2017
- Designing a network of critical zone observatories to explore the living skin of the terrestrial Earth
2017
- Impact of Wildfire on Solute Release in Forested Catchments, Jemez River, New Mexico, USA
2017
- Rates and mechanisms of uranyl oxyhydroxide mineral dissolution
2017
- Broadening ecosystem services through inclusion of a geoscience perspective
2016
- Microbial toxicity and characterization of DNAN (bio)transformation product mixtures
2016
- Soil Lysimeter Excavation for Coupled Hydrological, Geochemical, and Microbiological Investigations
2016
- Understanding ecosystem services from a geosciences perspective
2016
- Sequential anaerobic-aerobic biodegradatin of emerging insenstive munitions compound 3-nitro-1,2,4-triazol-5-one (NTO)
2016
- Phytostabillization of mine tailings using compost-assisted direct planting: Translating greenhouse results ot the field
2016
- Internal domains of natural porous media revealed: Critical locations for transport, storage and chemical reaction
2016
- U-series osotopic signatures of soils and headwater streams in a semi-arid complex volcanic terrain
2016
- Pore water chemistry reveals gradients in mineral transformation across a model basaltic hillslope
2016
- CO2 diffusion into pore spaces limits weathering rate of an experimental basalt landscape
2016
- Between Control and Complexity: Opportunities and Challenges for Marine Mesocosms
2016
- Arsenic remediation by formation of arsenic sulfide minerals in a continous anaerobic bioreactor
2016
- (Bio)transformation of 2,4-dinitroanisole (DNAN) in soils
2016
- Colloids and organic matter complexation control trace metal concentration-dsicharge relationships in Marshall Gulch stream waters
2016
- Mass balance of trace elements in weathering rocks
2016
- Resolving colocalization of bacteria and metal(loids) on plant root surfaces by combining fluorescence in situ hybridization (FISH) with multiple-energy micro-focused X-ray fluorescence
2016
- Zebrafish embryo toxicity of anaerobic biotransformation products from the insensitive munitions compout 2,4-dintroanisole
2016
- Light, earthworms, and soil resources as predictors of diversity of 10 soil invertebrate groups across monocultures of 14 tree species
2016
- Solid-phase redistribution of rare earth elements in hillslope pedons subjected to different hydrologic fluxes
2016
- Adsoprtion of novel insensitive minutions compounds at clay mineral and metal oxide surfaces
2015
- Rare earth elements as reactive tracers of biogeochemical weathering in forested rhyolitic terrain
2015
- Biotransformation and degradation of the insensitive munitions compound, 3-nitro-1,2,4-triazol-5-one, by soil bacterial communities.
2015
- Mineral nutrient mobilization by plants from rock: Influence of rock type and arbuscular mycorrhiza
2015
- Climatic, landscape, and edaphic controls on soil carbon efflux in seasonally snow covered forest ecosystems
2015
- Abundance and activity of 16S rRNA, AmoA and NifH bacterial genes during assisted phytostabilization of mine tailings
2015
- Climatic and landscape influences on soil moisture are primary determinants of soil carbon fluxes in seasonally snow-covered forest ecosystems.
2015
- Effects of litter traits, soil biota, and soil chemistry, and stand characteristics on soild C stocks at a common garden with 14 tree species
2015
- Quantifying particulate and colloidal relsease of radionuclides in waste-weathered Hanford sediments
2015
- Hydrological partitioning in the critical zone: Recent advances and opportunities for developing ransferable understanding of water cycle dynamics.
2015
- Toxic metal(loid) speciation during weatherin gof iron sulfide mine tailings under semi-arid climate
2015
- Rapid soil CO2 drawdown during incipient weathering of a granular basaltic landscape.
2015
- The Landscape Evolution Observatory: A large-scale controllable infrastructure to study coupled Earth-surface processes
2015
- Critical zone services: Expanding context, constraints, and curency beyond ecosystem services.
2015
- Forward to the Research Front on Mineral-Organic Interactions in Aqueous Systems
2015
- Climatic and landscape controls on water transit times and silicate mineral weathering in the Critical Zone
2015
- Quantifying topographic and vegetation effects on the trnasfer of energy and mass to a critical zone
2015
- Understanding of ecosystem services from a geosciences perspective
2015
- Surficial weathering of iron sulfide mine tailings under semi-arid climate
2014
- Stream water carbon controls in seasonally snow-covered mountain catchments: impact of inter-annual variability of water fluxes, catchment aspect and seasonal processes
2014
- Influence of Phosphate and Silica on U(VI) Precipitation from Acidic and Neutralized Wastewaters
2014
- Environmental factors influencing the structural dynamics of soil microbial communities during assisted phytostabilization of acid-generating mine tailings: A mesocosm experiment.
2014
- Experimental assessment of passive capillary wick sampler suitability for inorganic soil solution constituents
2014
- Fractionation of Dissolved Organic Matter by (Oxy)Hydroxide-Coated Sands: Competitive Sorbate Displacement during Reactive Transport
2014
- Critical Zone Services: Expanding Context, Constraints, and Currency beyond Ecosystem Services
2014
- Incipient subsurface heterogeneity and its effect on overland flow generation – insight from a modeling study of the first experiment at the Biosphere 2 Landscape Evolution Observatory
2014
- Bioaccessibility, release kinetics, and moelcular speciation of arsenic and lead in geo-dusts from the Iron King Mine Federal Superfund site in Humboldt, Arizona
2014
- Synthesis of 13C and 15N labeled 2,4-dinitroanisole
2014
- Hillslope-scale experiment demonstrates the role of convergence during two-step saturation
2014
- Impact of organic carbon on weathering and chemical denudation of granular basalt
2014
- Biomineralization of arsenate to arsenic sulfides is greatly enhanced at mildly acidic conditions
2014
- Mineral transformation controls speciation and pore-fluid transmission of contaminants in waste-weathered Hanfod sediments
2014
- Microscale speciation of arsenic and iron in ferric-based sorbents subjected to simulated landfill conditions
2013
- Complexation of trace organic contaminants with fractionated dissolved organic matter: Implications for mass spectrometric quantification
2013
- A new standard-based polynomial interpolation (SBPln) method to address gel-to-gel variability for the comparison of multiple denaturing gradient gel electrophoresis profile matrices
2013
- Coevolution of nonlinear trends in vegetation, soils, and topography with elevation and slope aspect: A case study in the sky islands of southern Arizona
2013
- Effect of silicic acid on arsenate and arsenite retention mechanisms on 6-L ferrihydrite: A spectroscopic and batch adsorption approach
2013
- The influence of goethite and gibbsite on soluble nutrient dynamics and microbial community composition
2013
- Sorptive fractionation of organic matter and formation of organo-hydroxy-aluminum complexes during litter biodegradation in the presence of gibbsite
2013
- Fractionation of yttrium and holmium during basaltic soil weathering
2013
- ATR-FTIR Spectroscopy Study of the Influence of pH and Contact Time on the Adhesion of Shewanella putrefaciens Bacterial Cells to the Surface of Hematite
2012
- Adsorption of perfluorooctanoic acid and perfluorooctanesulfonic acid to iron oxide surfaces as studied by flow-through ATR-FTIR spectroscopy
2012
- Response of key soil parameters during phytostabilization in extremely acidic tailings: effect of plant species
2012
- Impacts of sampling dissolved organic matter with passive capillary wicks versus aqueous soil extraction
2012
- Long-term carbon storage through retention of dissolved aromatic acids by reactive particles in soil
2012
- Quantifying PPCP interaction with dissolved organic matter in aqueous solution: Combined use of fluorescence quenching and tandem mass spectrometry
2012
- Tree species effects on coupled cycles of carbon, nitrogen, and acidity in mineral soils at a common garden experiment
2012
- Natural dissolved organic matter affects electrospray ionization during analysis of emerging contaminants by mass spectrometry
2012
- Strontium and cesium release mechanisms during unsaturated flow through waste-weathered Hanford sediments
2011
- How water, carbon, and energy drive landscape evolution and surface water dynamics: The Jemez River Basin
2011
- Calibration and testing of upland hillslope evolution models in a dated landscape: Banco Bonito, New Mexico
2011
- A mass-balance model to separate and quantify colloidal and solute redistributions in soil
2011
- Changes in zinc speciation with mine tailings acidification in an arid weathering environment
2011
- Interactions of carbamazepine in soil: Effects of dissolved organic matter
2011
- Iron solid-phase differentiation along a redox gradient in basaltic soils
2011
- Changes in water extractable organic matter during incubation of forest floor material in the presence of quartz, goethite and gibbsite surfaces
2011
- Stabilization of extracellular polymeric substances by adsorption versus co-precipitation with hydroxyl-aluminum species
2011
- Cesium and strontium incorporation into zeolite-type phases during homogeneous nucleation from caustic solutions
2011
- Effect of arbuscular mycorrhizal fungi on plant biomass and the rhizosphere microbial community structure of mesquite grown in acidic lead/zinc mine tailings
2011
- Stabilization of extracellular polymeric substances (Bacillus subtilis) by adsorption to and coprecipitation with Al forms
2011
- Amphiphile disruption of pathogen attachment at the hematite (α-Fe sub 2 /sub O sub 3 /sub )-Water Interface
2011
- How water, carbon, and energy drive critical zone evolution: the Jemez-Santa Catalina Critical Zone Observatory
2011
- Differential effects of dissolved organic carbon upon re-entrainment and surface properties of groundwater bacteria and bacteria-sized microspheres during transport through a contaminated, sandy aquifer
2011
- Trace contaminant concentration affects mineral transformation and pollutant fate in hydroxide-weathered Hanford sediments
2011
- Rare earth element release from phosphate minerals in the presence of organic acids
2010
- Comparison of transport and attachment behaviors of Cryptosporidium parvum oocysts and oocyst-sized microspheres being advected through three minerologically different granular porous media
2010
- Adsorption of sodium dodecyl sulfate (SDS) at ZnSe and α-Fe sub 2 /sub O sub 3 /sub surfaces: Combining infrared spectroscopy and batch uptake studies
2010
- Erratum: Contaminant Desorption during Long-Term Leaching of Hydroxide-Weathered Sediments(Environmental Science and Technology (2010) 44 (4384))
2010
- ATR-FTIR studies of phospholipid vesicle interactions with α-FeOOH and α-Fe sub 2 /sub O sub 3 /sub surfaces
2010
- Recalcitrance-dead and buried?
2010
- Mineralogical impact on organic nitrogen across a long-term soil chronosequence (0.3-4100 kyr)
2010
- Contaminant desorption during long-term leaching of hydroxide-weathered hanford sediments
2010
- Surface complexation of carboxylate adheres Cryptosporidium parvum oocysts to the hematite-water interface
2009
- A scanner-based approach to soil profile-wall mapping of root distribution
2009
- Biogeochemistry of mineral-organic associations across a long-term mineralogical soil gradient (0.3-4100 kyr), Hawaiian Islands
2009
- In-situ monitoring of Cryptosporidium parvum oocyst surface adhesion using ATR-FTIR spectroscopy
2009
- Solid phase evolution in the Biosphere 2 hillslope experiment as predicted by modeling of hydrologic and geochemical fluxes
2009
- Iron interference in the quantification of nitrate in soil extracts and its effect on hypothesized abiotic immobilization of nitrate
2008
- Silicon control of strontium and cesium partitioning in hydroxide-weathered sediments
2008
- ATR-FTIR study of lipopolysaccharides at mineral surfaces
2008
- Discussion papers
2008
- Physical chemistry of soils and aquifers: A special issue in honor of Garrison Sposito
2007
- Tree species effects on soil organic matter dynamics: The role of soil cation composition
2007
- Controls over leaf and litter calcium concentrations among temperate trees
2007
- Rayleigh fractionation of iron isotopes during pedogenesis along a climate sequence of Hawaiian basalt
2007
- Molecular weight and humification index as predictors of adsorption for plant- and manure-derived dissolved organic matter to goethite
2007
- Soil biogeochemicial processes within the critical zone
2007
- Infrared spectroscopy studies of cation effects on lipopolysaccharides in aqueous solution
2007
- Adsorption to goethite of extracellular polymeric substances from Bacillus subtilis
2006
- Colloid mobilization during soil iron redox oscillations
2006
- Leachate migration from spent mushroom substrate through intact and repacked subsurface soil columns
2006
- Effects of organic acids and dissolved oxygen on apatite and chalcopyrite dissolution: Implications for using elements as organomarkers and oxymarkers
2006
- Iron-oxide crystallinity increases during soil redox oscillations
2006
- ATR-FTIR spectroscopy reveals bond formation during bacterial adhesion to iron oxide
2006
- Wastewater dissolved organic matter: Characteristics and sorptive capabilities
2006
- Effects of organic ligands on granite dissolution in batch experiments at pH 6
2006
- Solid-state NMR identification and quantification of newly formed aluminosilicate phases in weathered kaolinite systems
2006
- Implications of the evolution of organic acid moieties for basalt weathering over geological time
2005
- FTIR spectroscopic study of biogenic Mn-oxide formation by Pseudomonas putida GB-1
2005
- Linking litter calcium, earthworms and soil properties: A common garden test with 14 tree species
2005
- Sorption of the antibiotic ofloxacin to mesoporous and nonporous alumina and silica
2005
- Element mobility patterns record organic ligands in soils on early Earth
2005
- Clay mineral weathering and contaminant dynamics in a caustic aqueous system I. Wet chemistry and aging effects
2005
- Surface charge evolution of mineral-organic complexes during pedogenesis in Hawaiian basalt
2004
- Influence of mesoporosity on the sorption of 2,4-dichlorophenoxyacetic acid onto alumina and silica
2004
- Adhesion of bacterial exopolymers to α-FeOOH: Inner-sphere complexation of phosphodiester groups
2004
- Interaction of phenanthrene and its primary metabolite (1-hydroxy-2- naphthoic acid) with estuarine sediments and humic fractions
2004
- Spectroscopic study of extracellular polymeric substances from Bacillus subtilis: Aqueous chemistry and adsorption effects
2004
- Protection of mesopore-adsorbed organic matter from enzymatic degradation
2004
- Solute release from weathering of spent mushroom substrate under controlled conditions
2004
- Mineral mesopore effects on nitrogenous organic matter adsorption
2004
- Proposed initiative would study earth's weathering engine
2004
- Transport and fractionation of dissolved organic matter in soil columns
2003
- A mechanism of abiotic immobilization of nitrate in forest ecosystems: The ferrous wheel hypothesis
2003
- Linking cesium and strontium uptake to kaolinite weathering in simulated tank waste leachate
2003
- Humic acid complexation of basic and neutral polycyclic aromatic compounds
2002
- Surface charge of variable porosity Al sub 2 /sub O sub 3 /sub (s) and SiO sub 2 /sub (s) adsorbents
2002
- Adsorption of quinoline to kaolinite and montmorillonite
2002
- Cesium adsorption on clay minerals: An EXAFS spectroscopic investigation
2002
- Leachate chemistry of field-weathered spent mushroom substrate
2001
- Reaction of forest floor organic matter at goethite, birnessite and smectite surfaces
2001
- The chemistry of pedogenic thresholds
2001
- Rapid abiotic transformation of nitrate in an acid forest soil
2001
- Effects of spent mushroom substrate weathering on the chemistry of underlying soils
2001
- Short communication: Biodegradation of 1-naphthol in the presence of humic acid
2000
- Evolution of CO sub 2 /sub during birnessite-induced oxidation of sup 14 /sup C-labeled catechol
2000
- Effects of solution chemistry on the oxidative transformation of 1-naphthol and its complexation with humic acid
2000
- Artifacts caused by collection of soil solution with passive capillary samplers
2000
- Organic matter transformations during the weathering process of spent mushroom substrate
2000
- Interaction of 1-naphthol and its oxidation products with aluminum hydroxide
1999
- Structural charge and cesium retention in a chronosequence of tephritic soils
1999
- Quinoline sorption on kaolinite-humic acid complexes
1999
- Role of surface precipitation in copper sorption by the hydrous oxides of iron and aluminum
1999
- Comparison of hematite coagulation by charge screening and phosphate adsorption: Differences in aggregate structure
1997
- Colloid chemistry of kaolinitic tropical soils
1995
- Dissolution behavior of kaolinitic tropical soils
1995
- Surface charge characteristics of Podzolized soil
1995
- Surface charge characteristics of kaolinitic tropical soils
1995
- Solution chemistry profiles of mixed-conifer forests before and after fire
1994