Skip to main content

EN
ÍS

Forsíða

Forsíða

Kristín Vala Ragnarsdóttir - Prófessor emerita

Kristín Vala Ragnarsdóttir

–

Verkfræði- og náttúruvísindasvið

Kristín Vala Ragnarsdóttir

Prófessor emerita

Sjálfbærnivísindi

Aðsetur
Askja / N-226
Sími
5255886 8949502
Tölvupóstur
vala [hjá] hi.is

Starfseining
Jarðvísindadeild
Vefsíða
https://orcid.org/0000-0001-6958-0734

ORCID vefsíða
https://orcid.org/0000-0001-6958-0734
Rannsóknagátt – Kristín Vala Ragnarsdóttir

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

2020

Global phosphorus supply chain dynamics: Assessing regional impact to 2050Global Food Security
Corruption Risks in Renewable Resource Governance: Case Studies in Iceland and Romania
Opening access to the black box: The need for reporting on the global phosphorus supply chainAmbio

2019

The WORLD6 integrated system dynamics modelProgress Towards the Resources Revolution
On the long-term sustainability of copper, zinc and lead supply, using a system dynamics modelResources, Conservation and Recycling: X
On the metal contents of ocean floor nodules, crusts and massive sulphidesProgress Powards the Resource Revolution

2018

A System Dynamics Assessment of the Supply of Molybdenum and Rhenium Used for Super-alloys and Specialty Steels, Using the WORLD6 ModelBioPhysical Economics and Resource Quality
Reviewing integrated sustainability indicators for tourismJournal of Sustainable Tourism
The Economic Challenges of the UN Sustainable Development Goals; a Systems Dynamics approach.System Change
From waste to resource: A systems dynamics and stakeholder analysis of phosphorus recycling from municipal wastewater in Europe.Ambio
Toward a Sustainable Wellbeing Economy.Solutions (for a sustainable and desirable future)
The Economic Challenges of the UN Sustainable Development Goals; a Systems Dynamics approach.System change
Global megatrends and resource use - A systemic reflection. Factor X. Eco-Efficiency in Industry and Science
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

2017

Quantifying soil functions in Earth’s Critical Zone: Key results and conclusionsAdvances in Agronomy
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
Soil aggregation and soil organic matter in conventionally and organically farmed Austrian ChernozemsBodenkultur
Renewable energy use for aquaponics development on a global scale towards sustainable food productionGeothermal, Wind and Solar Energy Applications in Agriculture and Aquaculture
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
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
Stakeholder Participation in Developing Sustainability Indicators for a European Northern Periphery Tourism SystemJournal of Rural and Community Development
Adapting to a new economic reality: Responding to global challenges with systems thinkingSystem Change
Estimating critical extraction rates for the main metals for a sustainable society within the planetary limitsBoosting 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
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
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
Renewable energy use for aquaponics development on global scale towards sustainable food productionGeothermal, Wind and Solar Energy Applications in Agriculture and Aquaculture

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

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 management
Aquaponics Guidelines
Aggregation and organic matter in subarctic Andosols under different grassland management
Soil: The Life Supporting Skin of Earth
Aggregation and organic matter in subarctic Andosols under different grassland management
The Interlayer Regions of Sheet Silicates as a Favorable Habitat for Endolithic MicroorganismsGeomicrobiology Journal
Energy return on investment of Austrian sugar beet: A small-scale comparison between organic and conventional productionBiomass & Bioenergy
1 Soil: The Life Supporting Skin of Earth
Aggregation and organic matter in subarctic Andosols under different grassland management
An ecosystem approach to assess soil quality in organically and conventionally managed farms in Iceland and AustriaSOIL
Challenges of Sustainable and Commercial AquaponicsSustainability
A Comparative Analysis of the Energy Return on Investment of Organic and Conventional Icelandic Dairy FarmsIcelandic Agricultural Sciences
Aggregation and organic matter in subarctic Andosols under different grassland managementActa Agriculturae Scandinavica Section B-Soil and Plant Science
Aluminium for the future: Modelling the global production, market supply, demand, price and long term development of the global reservesResources Conservation and Recycling
Aggregation and organic matter in subarctic Andosols under different grassland management

2014

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

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

High resolution characterization of ectomycorrhizal fungal-mineral interactions in axenic microcosm experimentsBiogeochemistry
Removal of Uranium(VI), Lead(II) at the Surface of TiO2 Nanotubes Studied by X-Ray Photoelectron SpectroscopyWater Air and Soil Pollution
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
Foreword: A foreword by Lord SelbornePollutants, Human Health and the Environment: A Risk Based Approach
IntroductionPollutants, Human Health and the Environment: A Risk Based Approach
Nanoscale channels on ectomycorrhizal-colonized chlorite: Evidence for plant-driven fungal dissolutionJournal of Geophysical Research-Biogeosciences
Soil processes and functions across an international network of Critical Zone Observatories: Introduction to experimental methods and initial resultsComptes Rendus Geoscience
Conclusions: Pollutants, Risk and Society: Sustainable SystemsPollutants, Human Health and the Environment: A Risk Based Approach
Pollutants, Human Health and the Environment: A Risk Based ApproachPollutants, Human Health and the Environment: A Risk Based Approach
Radioactivity and RadioelementsPollutants, Human Health and the Environment: A Risk Based Approach
IntroductionPollutants, Human Health and the Environment: A Risk Based Approach

2011

Pollutants, human health and the environment - A risk-based approachApplied Geochemistry
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
Biochar application in a tropical, agricultural region: A plot scale study in Tamil Nadu, IndiaApplied Geochemistry
Icelandic Economic Collapse. A systems analysis perspective on financial, social and world system links
Challenging the planetary boundaries I: Basic principles of an integrated model for phosphorous supply dynamics and global population sizeApplied Geochemistry
Soil Processes and Functions in Critical Zone Observatories: Hypotheses and Experimental DesignVadose Zone Journal
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

2010

Soil Research Concepts that will Underpin European Soil Sustainability. Soil sustainability in Europe as deduced from investigation of the Critical Zone
City-scale carbon management: An innovative methodology for imagining a low carbon future abstract # 18315th IUAPPA World Clean Air Congress 2010, Presentations
Minerals under attack: From ions to eukaryotesGeochimica Et Cosmochimica Acta

2009

Weathering of Chlorite studied at the nanometre scale using Atomic Force Microscopy (AFM)Geochimica 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
The effects of prion protein expression on metal metabolismMolecular and Cellular Neuroscience
Novel techniques for investigation of the cell-mineral interfaceGeochimica Et Cosmochimica Acta
TiO2 anatase nanotubes for the purification of uranium, arsenic and lead containing water: An X-ray photoelectron spectroscopy studyMaterials Research Society Symposium Proceedings
Biochar application in Tamil Nadu and the global food crisisGeochimica Et Cosmochimica Acta
Paxillus involutus hyphae: Imaging their structure and interaction with mineral surfaces using AFMGeochimica Et Cosmochimica Acta
TiO2 anatase nanotubes for the purification of uranium,arsenic and lead containing water: An X-ray Photoelectron Spectroscopy studyMaterials Research Society Symposium Proceedings
Challenges at the entry into the ecological ageGeochimica Et Cosmochimica Acta
TiO2 anatase nanotubes for the purification of uranium,arsenic and lead containing water: An X-ray photoelectron spectroscopy studyMaterials Research Society Symposium Proceedings
Investigation of the light-induced degradation of glutamic acid and stabilisation of glucose on the surface of iron-bearing mineralsGeochimica Et Cosmochimica Acta

2008

Rare metals getting rarerNature Geoscience
Re-partitioning of Cu and Zn isotopes by modified protein expressionGeochemical Transactions
High-resolution imaging of biotite dissolution and measurement of activation energyMineralogical Magazine
Effect of cyanobacterial growth on biotite surfaces under laboratory nutrient-limited conditionsMineralogical Magazine
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

2007

Non-ideal solid solution aqueous solution modeling of synthetic calcium silicate hydrateCement and Concrete Research
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
Copper deficiency elicits glial and neuronal response typical of neurodegenerative disordersNeuropathology and Applied Neurobiology
Crossing disciplines and scales to understand the Critical ZoneElements
Chapter 5 Prions, Metals, and SoilsDevelopments in Earth and Environmental Sciences
Biologically-mediated weathering of minerals from nanometre scale to environmental systemsGeochimica Et Cosmochimica Acta
The apparent activation energy for biotite dissolution by in situ atomic force microscopy (AFM) observationsGeochimica Et Cosmochimica Acta

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
The reduction of aqueous Au3+ by sulfide minerals and green rust phasesAmerican Mineralogist
The reduction of aqueous Au³⁺ by sulfide minerals and green rust phasesAmerican Mineralogist
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

2002

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

2001

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
Experimental determination of the complexation of strontium and cesium with acetate in high-temperature aqueous solutionsGeochimica Et Cosmochimica Acta

2000

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

1999

Surface complexation of Hg2+ on goethite: Mechanism from EXAFS spectroscopy and density functional calculationsJournal of Colloid and Interface Science
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
The mechanism of cadmium surface complexation on iron oxyhydroxide mineralsGeochimica Et Cosmochimica Acta
Mineral/reagent interactions: An X-ray photoelectron spectroscopic study of adsorption of reagents onto mixtures of mineralsClay Minerals
Mineral/reagent interactions: an X-ray photoelectron spectroscopic study of adsorption of reagents onto mixtures of mineralsClay Minerals

1998

An EXAFS spectroscopic study of aqueous antimony(III)-chloride complexation at temperatures from 25 to 250 degrees CChemical Geology
XPS analysis of polyacrylamide adsorption to kaolinite, quartz and feldsparSurface and Interface Analysis
An extended X-ray absorption fine structure spectroscopy investigation of cadmium sorption on cryptomelane (KMn(8)O(16))Chemical Geology
Geochemistry of crustal fluids: a Tyrolean perspective - PrefaceChemical Geology
The Adsorption Mechanism of Sr²⁺ on the Surface of GoethiteRadiochimica Acta
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
Aqueous speciation of yttrium at temperatures from 25 to 340°C at Psat: An in situ EXAFS studyChemical Geology
The dissolution of apatite in the presence of aqueous metal cations at pH 2-7Chemical Geology
The adsorption mechanism of Sr2+ on the surface of goethiteRadiochimica Acta
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
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
Aqueous speciation of yttrium at temperatures from 25 to 340 degrees C at P-sat: an in situ EXAFS studyChemical 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
Solubility of uranium oxide and calcium uranate in water, and Ca(OH)(2)-bearing solutionsRadiochimica Acta

1996

Surface chemistry of reacted heulandite determined by SIMS and XPSChemical Geology
Computer aided analysis of X-ray images in mudstone concretions from Budleigh Salterton, DevonGeoscience in South-West England
Computer aided analysis of X-ray images in mudstone concretions from Budleigh Salterton, DevonProceedings - Ussher Society
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
LREE distribution in perovskite, apatite and titanite from South West Ugandan xenoliths and kamafugite lavasMineralogy and Petrology

1995

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

1994

The uranium-thorium and rare earth element geochemistry of reduction nodules from Budleigh Salterton, DevonGeoscience in South-West England
URANIUM AND THORIUM SOLUBILITIES IN SUBDUCTION ZONE FLUIDSEarth and Planetary Science Letters
The uranium-thorium and rare earth element geochemistry of reduction nodules from Budleigh Salterton, DevonProceedings - Ussher Society

1993

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

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
Pressure sensitive "silica geothermometer" determined from quartz solubility experiments at 250 °CGeochimica et Cosmochimica Acta

1982

Mechanical restitution of the rat papillary muscleActa Physiologica Scandinavica