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Háskóli Íslands

Háskóli Íslands

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Forsíða

Kristín Vala Ragnarsdóttir - Prófessor

Kristín Vala Ragnarsdóttir

–

Verkfræði- og náttúruvísindasvið

Kristín Vala Ragnarsdóttir

Prófessor

Sjálfbærnivísindi

Aðsetur
Askja / N-231
Sími
5255886 8949502
Tölvupóstur
vala [hjá] hi.is

Starfseining
Jarðvísindadeild

ORCID vefsíða
https://orcid.org/0000-0001-6958-0734

Starfsferill

2008 - 2008, Forseti Verkfræði og Náttúruvísindasviðs, Háskóla Íslands
2006 - 2008, Prófessor í Umhverfissjálfbærni, Bristolháskóla Bristol Bretlandi
2001 - 2006, Prófessor í Umhverfisjarðefnafræði, Jarðvísindadeild Bristolháskóla Bristol Bretlandi
1997 - 2001, Dósent, Jarðfræðideild Bristolháskóla Bristol Bretlandi
1994 - 1997, Lektor, Jarðfræðideild Bristolháskóla Bristol Bretlandi
1989 - 1994, Vísindamaður, Jarðfræðideild Bristolháskóla Bretlandi
1988 - 1989, Rannsóknalektor, Jarðfræðideild Northwestern Háskóli Evanston Illinois Bandaríkjunum
1986 - 1987, Nýdoktor, Institute de Physique du Globe Parísarháskóla París Frakklandi
1985 - 1986, Jarðefnafræðingur, PRC Environmental Management Chicago Illinois Bandaríkjunum

Útgefið efni

2018

The Economic Challenges of the UN Sustainable Development Goals; a Systems Dynamics approach.System change
The Economic Challenges of the UN Sustainable Development Goals; a Systems Dynamics approach.System Change
A system dynamics assessment of the supply of molybdenum and rhenium used for super-alloys and speciality steels, using the WORLD6 model.BioPhysical Economics and Resource Quality
From waste to resource: A systems dynamics and stakeholder analysis of phosphorus recycling from municipal wastewater in Europe.Ambio
Reviewing integrated sustainability indicators for tourismJournal of Sustainable Tourism
Global megatrends and resource use - A systemic reflection. Factor X. Eco-Efficiency in Industry and Science
Toward a Sustainable Wellbeing Economy.Solutions (for a sustainable and desirable future)

2017

Stakeholder Participation in Developing Sustainability Indicators for a European Northern Periphery Tourism SystemJournal of Rural and Community Development
Soil Functions in Earth's Critical Zone: Key Results and ConclusionsQuantifying and Managing Soil Functions in Earth's Critical Zone Combining Experimentation and Mathematical Modelling
An assessment of metal supply sustainability as an input to policy: security of supply extraction rates, stocks-in-use, recycling, and risk of scarcityJournal of Cleaner Production
Defining a free market: drivers of unsustainability as illustrated with an example of shrimp farming in the mangrove forest in South East AsiaJournal of Cleaner Production
Renewable energy use for aquaponics development on global scale towards sustainable food productionGeothermal, Wind and Solar Energy Applications in Agriculture and Aquaculture
Modelling the global copper, zinc and lead mining rates and co-extraction of technology metals, market supply, price and remaining extractable amountsBoosting Resource Productivity by Adopting the Circular Economy
Modelling the global primary extraction , supply, price and depletion of the extractable geological resources using the cobalt modelBoosting Resource Productivity by Adopting the Circular Economy
Substitution of metals in times of potential supply limitations: What are the mitigation options and limitations?Boosting Resource Productivity by Adopting the Circular Economy
Estimating critical extraction rates for the main metals for a sustainable society within the planetary limitsBoosting Resource Productivity by Adopting the Circular Economy
Quantifying soil functions in Earth’s Critical Zone: Key results and conclusionsAdvances in Agronomy

2016

Soil indicators for sustainable development: A transdisciplinary approach for indicator development using expert stakeholdersAgriculture Ecosystems & Environment
Modelling and measuring sustainable wellbeing in connection with the UN Sustainable Development GoalsEcological Economics
A system dynamics model for platinum group metal supply, market price, depletion of extractable amounts, ore grade, recycling and stocks-in-useResources Conservation and Recycling

2015

Aluminium for the future: Modelling the global production, market supply, demand, price and long term development of the global reservesResources Conservation and Recycling
Challenges of Sustainable and Commercial AquaponicsSustainability
Energy return on investment of Austrian sugar beet: A small-scale comparison between organic and conventional productionBiomass & Bioenergy
A Comparative Analysis of the Energy Return on Investment of Organic and Conventional Icelandic Dairy FarmsIcelandic Agricultural Sciences
The Interlayer Regions of Sheet Silicates as a Favorable Habitat for Endolithic MicroorganismsGeomicrobiology Journal
Aggregation and organic matter in subarctic Andosols under different grassland management (vol 65, pg 246, 2015)Acta Agriculturae Scandinavica Section B-Soil and Plant Science
Aggregation and organic matter in subarctic Andosols under different grassland managementActa Agriculturae Scandinavica Section B-Soil and Plant Science

2014

Investigating the sustainability of the global silver supply, reserves, stocks in society and market price using different approachesResources Conservation and Recycling
Chlorite topography and dissolution of the interlayer studied with atomic force microscopyAmerican Mineralogist
NATURAL RESOURCES IN A PLANETARY PERSPECTIVEGeochemical Perspectives
SoilTrEC: a global initiative on critical zone research and integrationEnvironmental Science and Pollution Research
Time to leave GDP behindNature
Soil Aggregate Stability in Different Soil Orders Quantified by Low Dispersive Ultrasonic Energy LevelsSoil Science Society of America Journal
On modelling the global copper mining rates, market supply, copper price and the end of copper reservesResources Conservation and Recycling
Bioremediation trial on aged PCB-polluted soils-a bench study in IcelandEnvironmental Science and Pollution Research

2013

Nanoscale Observations of Extracellular Polymeric Substances Deposition on Phyllosilicates by an Ectomycorrhizal FungusGeomicrobiology Journal
Investigating the role of microbes in mineral weathering: Nanometre-scale characterisation of the cell-mineral interface using FIB and TEMMicron

2012

Removal of Uranium(VI), Lead(II) at the Surface of TiO2 Nanotubes Studied by X-Ray Photoelectron SpectroscopyWater Air and Soil Pollution
Soil processes and functions across an international network of Critical Zone Observatories: Introduction to experimental methods and initial resultsComptes Rendus Geoscience
Assessing the impact of soil degradation on food productionCurrent Opinion in Environmental Sustainability
Exploring a city's potential low carbon futures using Delphi methods: some preliminary findingsJournal of Environmental Planning and Management
High resolution characterization of ectomycorrhizal fungal-mineral interactions in axenic microcosm experimentsBiogeochemistry
Nanoscale channels on ectomycorrhizal-colonized chlorite: Evidence for plant-driven fungal dissolutionJournal of Geophysical Research-Biogeosciences

2011

Soil Processes and Functions in Critical Zone Observatories: Hypotheses and Experimental DesignVadose Zone Journal
Special Issue - Ninth International Symposium on the Geochemistry of the Earth's Surface (GES-9) - "Biochar application in a tropical, agricultural region: A plot scale study in Tamil Nadu, India" (vol 26S, pg S218, 2011)Applied Geochemistry
Pollutants, human health and the environment - A risk-based approachApplied Geochemistry
In situ atomic force microscopy measurements of biotite basal plane reactivity in the presence of oxalic acidGeochimica Et Cosmochimica Acta
Challenging the planetary boundaries II: Assessing the sustainable global population and phosphate supply, using a systems dynamics assessment modelApplied Geochemistry
Challenging the planetary boundaries I: Basic principles of an integrated model for phosphorous supply dynamics and global population sizeApplied Geochemistry
Biochar application in a tropical, agricultural region: A plot scale study in Tamil Nadu, IndiaApplied Geochemistry

2010

Minerals under attack: From ions to eukaryotesGeochimica Et Cosmochimica Acta

2009

Novel techniques for investigation of the cell-mineral interfaceGeochimica Et Cosmochimica Acta
Paxillus involutus hyphae: Imaging their structure and interaction with mineral surfaces using AFMGeochimica Et Cosmochimica Acta
Investigation of the light-induced degradation of glutamic acid and stabilisation of glucose on the surface of iron-bearing mineralsGeochimica Et Cosmochimica Acta
Biochar application in Tamil Nadu and the global food crisisGeochimica Et Cosmochimica Acta
The effects of prion protein expression on metal metabolismMolecular and Cellular Neuroscience
Weathering of Chlorite studied at the nanometre scale using Atomic Force Microscopy (AFM)Geochimica Et Cosmochimica Acta
Challenges at the entry into the ecological ageGeochimica Et Cosmochimica Acta
The Cu, Mn and Zn concentration of sheep wool: Influence of washing procedures, age and colour of matrixScience of the Total Environment

2008

Reaction mechanism of uranyl in the presence of zero-valent iron nanoparticlesGeochimica Et Cosmochimica Acta
The adsorption of progesterone onto mineral surfaces imaged with high-resolution atomic force microscopyMineralogical Magazine
Re-partitioning of Cu and Zn isotopes by modified protein expressionGeochemical Transactions
High-resolution imaging of biotite dissolution and measurement of activation energyMineralogical Magazine
Rare metals getting rarerNature Geoscience
Effect of cyanobacterial growth on biotite surfaces under laboratory nutrient-limited conditionsMineralogical Magazine

2007

The apparent activation energy for biotite dissolution by in situ atomic force microscopy (AFM) observationsGeochimica Et Cosmochimica Acta
Biologically-mediated weathering of minerals from nanometre scale to environmental systemsGeochimica Et Cosmochimica Acta
Copper deficiency elicits glial and neuronal response typical of neurodegenerative disordersNeuropathology and Applied Neurobiology
Crossing disciplines and scales to understand the Critical ZoneElements
Geomicrobiology of a weathering crust from an impact crater and a hypothesis for its formationGeomicrobiology Journal
Measurements of daily urinary uranium excretion in German peacekeeping personnel and residents of the Kosovo region to assess potential intakes of depleted uranium (DU)Science of the Total Environment
Non-ideal solid solution aqueous solution modeling of synthetic calcium silicate hydrateCement and Concrete Research

2006

The effect of iron on montmorillonite stability. (II) Experimental investigationGeochimica Et Cosmochimica Acta
The effect of iron on montmorillonite stability. (I) Background and thermodynamic considerationsGeochimica Et Cosmochimica Acta
Bioavailable copper and manganese in soils from Iceland and their relationship with scrapie occurrence in sheepJournal of Geochemical Exploration

2005

The effect of iron on bentonite stabilityGeochimica Et Cosmochimica Acta
The geochemistry of fluids from an active shallow submarine hydrothermal system: Milos island, Hellenic Volcanic ArcJournal of Volcanology and Geothermal Research
Trace metals in soils and their relationship with scrapie occurranceGeochimica Et Cosmochimica Acta
Kinetic studies of synthetic metaschoepite under acidic conditions in batch and flow experimentsEnvironmental Science & Technology

2004

Combined high precision Cu, Zn and Fe isotopes in mice brainsGeochimica Et Cosmochimica Acta

2003

Surface reactivity of volcanic ash from the eruption of Soufriere Hills volcano, Montserrat, West Indies with implications for health hazardsEnvironmental Research
Hydrous ferric oxide: evaluation of Cd-HFO surface complexation models combining Cd-K EXAFS data, potentiometric titration results, and surface site structures identified from mineralogical knowledgeJournal of Colloid and Interface Science
The reduction of aqueous Au3+ by sulfide minerals and green rust phasesAmerican Mineralogist

2002

A potentiometric study of Eu3+ complexation with acetate ligand from 25 to 170 degrees C at P-satGeochimica Et Cosmochimica Acta

2001

Experimental determination of the complexation of strontium and cesium with acetate in high-temperature aqueous solutionsGeochimica Et Cosmochimica Acta
Sorption of As(V) on green rust (Fe-4(II)Fe-2(III)(OH)(12)SO4 center dot 3H(2)O) and lepidocrocite (gamma-FeOOH): Surface complexes from EXAFS spectroscopyGeochimica Et Cosmochimica Acta

2000

Influence of anionic layer structure of Fe-oxyhydroxides on the structure of Cd surface complexesJournal of Colloid and Interface Science
Antimony transport in hydrothermal solutions: an EXAFS study of antimony(V) complexation in alkaline sulfide and sulfide-chloride brines at temperatures from 25 degrees C to 300 degrees C at P-satChemical Geology
Environmental fate and toxicology of organophosphate pesticidesJournal of the Geological Society
Speciation of tin (Sn2+ and Sn4+) in aqueous Cl solutions from 25 degrees C to 350 degrees C: an in situ EXAFS studyChemical Geology
The boron isotope systematics of Icelandic geothermal waters: 1. Meteoric water charged systemsGeochimica Et Cosmochimica Acta
Trace element partitioning between wollastonite and silicate-carbonate meltMineralogical Magazine
Complexation of Cu2+ in oxidized NaCl brines from 25 degrees C to 175 degrees C: results from in situ EXAFS spectroscopyChemical Geology

1999

Surface complexation of Hg2+ on goethite: Mechanism from EXAFS spectroscopy and density functional calculationsJournal of Colloid and Interface Science
The mechanism of cadmium surface complexation on iron oxyhydroxide mineralsGeochimica Et Cosmochimica Acta
Effect of inorganic and organic ligands on the mechanism of cadmium sorption to goethiteGeochimica Et Cosmochimica Acta
Geochemistry in aqueous systems - A special issue in honor of Werner Stumm - PrefaceGeochimica Et Cosmochimica Acta
Mineral/reagent interactions: an X-ray photoelectron spectroscopic study of adsorption of reagents onto mixtures of mineralsClay Minerals

1998

The adsorption mechanism of Sr2+ on the surface of goethiteRadiochimica Acta
The dissolution of apatite in the presence of aqueous metal cations at pH 2-7Chemical Geology
XPS analysis of polyacrylamide adsorption to kaolinite, quartz and feldsparSurface and Interface Analysis
Standard thermodynamic properties and heat capacity equations for rare earth element hydroxides. I. La(OH)(3)(s) and Nd(OH)(3)(s). Comparison of thermochemical and solubility dataRadiochimica Acta
Geochemistry of crustal fluids: a Tyrolean perspective - PrefaceChemical Geology
Aqueous speciation of yttrium at temperatures from 25 to 340 degrees C at P-sat: an in situ EXAFS studyChemical Geology
An extended X-ray absorption fine structure spectroscopy investigation of cadmium sorption on cryptomelane (KMn(8)O(16))Chemical Geology
An EXAFS spectroscopic study of aqueous antimony(III)-chloride complexation at temperatures from 25 to 250 degrees CChemical Geology
Standard thermodynamic properties and heat capacity equations of rare earth hydroxides: II. Ce(III)-, Pr-, Sm-, Eu(III)-, Gd-, Tb-, Dy-, Ho-, Er-, Tm-, Yb-, and Y-hydroxides. Comparison of thermochemical and solubility dataChemical Geology

1997

Solubility of uranium oxide and calcium uranate in water, and Ca(OH)(2)-bearing solutionsRadiochimica Acta
Controls on uranium and thorium behaviour in ocean-floor hydrothermal systems: Examples from the Pindos ophiolite, GreeceChemical Geology
Controls on polyacrylamide adsorption to quartz, kaolinite, and feldsparGeochimica Et Cosmochimica Acta

1996

Surface chemistry of reacted heulandite determined by SIMS and XPSChemical Geology
LREE distribution in perovskite, apatite and titanite from South West Ugandan xenoliths and kamafugite lavasMineralogy and Petrology
Determination of the rare earth elements in aqueous samples at sub-ppt levels by inductively coupled plasma mass spectrometry and flow injection ICPMSAnalytical Chemistry

1995

On the origin of zoned grossular-andradite garnets in hydrothermal systemsEuropean Journal of Mineralogy

1994

URANIUM AND THORIUM SOLUBILITIES IN SUBDUCTION ZONE FLUIDSEarth and Planetary Science Letters

1993

DETERMINATION OF URANIUM AND THORIUM IN BASALTS AND URANIUM IN AQUEOUS-SOLUTION BY INDUCTIVELY-COUPLED PLASMA-MASS SPECTROMETRYJournal of Analytical Atomic Spectrometry
DISSOLUTION KINETICS OF HEULANDITE AT PH 2-12 AND 25-DEGREES-CGeochimica Et Cosmochimica Acta

1988

RELATIONSHIP BETWEEN ISOTOPIC VARIATIONS AND GEOGRAPHICAL-DISTRIBUTION OF MORBS AND OIBS-CABSChemical Geology

1985

EXPERIMENTAL-DETERMINATION OF CORUNDUM SOLUBILITIES IN PURE WATER BETWEEN 400-700-DEGREES-C AND 1-3 KBARGeochimica Et Cosmochimica Acta

1984

DESCRIPTION AND INTERPRETATION OF THE COMPOSITION OF FLUID AND ALTERATION MINERALOGY IN THE GEOTHERMAL SYSTEM, AT SVARTSENGI, ICELANDGeochimica Et Cosmochimica Acta

1983

PRESSURE SENSITIVE SILICA GEOTHERMOMETER DETERMINED FROM QUARTZ SOLUBILITY EXPERIMENTS AT 250-DEGREES-CGeochimica Et Cosmochimica Acta