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  • American Chemical Society  (2,084,048)
  • Amsterdam : Elsevier
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  • 1
    Call number: PIK 24-95653
    Type of Medium: Monograph available for loan
    Pages: xviii, 738 Seiten , Illustrationen, Diagramme
    Edition: Second edition
    ISBN: 9780323855143
    Language: English
    Note: Part 1: Recycling in context Chapter 1: Introduction Abstract 1.1: The Challenges 1.2: The Role of Materials in Society 1.3: From Linear to Circular Economy 1.4: Recycling in the Circular Economy 1.5: The Book References Chapter 2: The fundamental limits of circularity quantified by digital twinning Abstract 2.1: Introduction 2.2: A Product and Material Focus on Recycling Within the CE 2.3: Digital Twinning of the CE System: Understanding the Opportunities and Limits 2.4: Opportunities and Challenges References Chapter 3: Maps of the physical economy to inform sustainability strategies Abstract Acknowledgments 3.1: Introduction 3.2: Dimensions of MFA 3.3: Components for Monitoring the Physical Economy 3.4: Application of the Framework: Maps of the Aluminum Cycle 3.5: Recommendations References Chapter 4: Material efficiency—Squaring the circular economy: Recycling within a hierarchy of material management strategies Abstract 4.1: Is a Circular Economy Possible or Desirable? 4.2: Hierarchies of Material Conservation 4.3: When Is Recycling Not the Answer? 4.4: Discussion References Chapter 5: Material and product-centric recycling: design for recycling rules and digital methods Abstract Acknowledgements 5.1: Introduction 5.2: Recyclability Index and Ecolabeling of Products 5.3: DfR Rules and Guidelines 5.4: Product-Centric Recycling 5.5: Examples of Recycling System Simulation 5.6: Summary 5.7: Future Challenges References Additional Reading Chapter 6: Developments in collection of municipal waste Abstract 6.1: Introduction 6.2: Definitions and Models 6.3: A Global Picture of SWM 6.4: Collection and Recovery Systems 6.5: Future Developments 6.6: Conclusion and Outlook References Chapter 7: The path to inclusive recycling: Developing countries and the informal sector Abstract 7.1: Introduction 7.2: Definition and Links With the Formal Sector 7.3: Informal Waste Tire Recycling: Challenges and Opportunities 7.4: Approaches Towards Inclusive Recycling 7.5: Policies and Standardization Developments for Inclusive Recycling 7.6: Conclusion and Outlook References Part 2: Recycling from a product perspective Chapter 8: Physical separation Abstract 8.1: Introduction 8.2: Properties and Property Spaces 8.3: Breakage 8.4: Particle Size Classification 8.5: Gravity Separation 8.6: Flotation 8.7: Magnetic Separation 8.8: Eddy Current Separation 8.9: Electrostatic Separation 8.10: Sorting 8.11: Conclusion References Chapter 9: Sensor-based sorting Abstract 9.1: Mechanical Treatment of Waste 9.2: Principle of Sensor-Based Sorting 9.3: Requirements for Optimal Sorting Results 9.4: Available Sensors 9.5: Application of Different Sensors in Recycling 9.6: Recent Developments 9.7: Outlook References Chapter 10: Mixed bulky waste Abstract 10.1: Introduction 10.2: The Circular Process for Mixed Bulky Waste 10.3: Conditions for Economically Viable Sorting 10.4: Sorting of Mixed Bulky Waste 10.5: Sorting Process 10.6: Recycling Efficiency 10.7: Conclusion and Outlook Reference Chapter 11: Packaging Abstract 11.1: Introduction 11.2: Packaging Waste 11.3: Composition 11.4: Recovery and Recycling 11.5: Collection and Recovery Schemes 11.6: Conclusion and Outlook References Chapter 12: End-of-life vehicles Abstract 12.1: Introduction 12.2: Vehicle Composition 12.3: Recycling Chain 12.4: Recycling of Automotive parts 12.5: Recycling of Automotive Fluids 12.6: Automotive Shredder Residue 12.7: Future Developments and Outlook 12.8: Conclusions References Further Reading Chapter 13: Electrical and electronic equipment (WEEE) Abstract 13.1: Introduction 13.2: Waste Characterization 13.3: Recycling Chain and Technologies 13.4: Future Developments 13.5: Conclusions References Chapter 14: Photovoltaic and wind energy equipment Abstract 14.1: Introduction 14.2: Wind Turbines 14.3: Photovoltaic Modules 14.4: Wind Turbine Recycling 14.5: PV Recycling 14.6: Future Developments 14.7: Key Issues and Challenges 14.8: Conclusions and Outlook References Chapter 15: Buildings Abstract 15.1: The Why: Buildings and Circularity 15.2: The How and Who: A Framework 15.3: The When: Shearing Layers 15.4: The What: Materials in Buildings 15.5: Improving Data on Materials 15.6: The How, Who, When, and What 15.7: Outlook References Chapter 16: Construction and demolition waste Abstract Acknowledgments 16.1: Introduction 16.2: C&D Waste Use 16.3: Recycling 16.4: Recycling Technologies and Practice 16.5: Future Developments 16.6: Conclusion and Outlook References Chapter 17: Industrial by-products Abstract 17.1: Waste, By-product, or Product? 17.2: Major By-products 17.3: Where and How to Use By-products 17.4: Technical and Environmental Requirements 17.5: Sustainability Aspects 17.6: Conclusions, Challenges, and Outlook References Chapter 18: Mine tailings Abstract 18.1: Introduction 18.2: Future Opportunities for Tailings Management 18.3: Main Drivers for Change 18.4: Emerging Technologies 18.5: Conclusions and Outlook References Further Reading Part 3: Recycling from a material perspective Chapter 19: Steel Abstract 19.1: Introduction 19.2: Use Phase and Recycling Examples 19.3: Classification of Steel Scrap 19.4: Requirements for Scrap 19.5: Treatment Process 19.6: Steel Scrap Smelting Process 19.7: Steel 19.8: Alloy or Tramp Elements? 19.9: Purification of Scrap 19.10: Outlook References Further Reading Chapter 20: Aluminum Abstract 20.1: Introduction 20.2: Alloys and Their Recycling 20.3: Melt Loss 20.4: Used Beverage Can (UBC) Recycling 20.5: Wheel Recycling 20.6: Dross Processing 20.7: Purification and Refining 20.8: Future Trends and Challenges References Chapter 21: Copper Abstract 21.1: Sources of Copper Scrap 21.2: Smelting and Refining of Copper Scrap 21.3: Conclusions and Outlook References Further Reading Chapter 22: Lead Abstract 22.1: Introduction 22.2: Material Use 22.3: The Lead-Acid Battery 22.4: Recycling Technologies 22.5: Future Developments 22.6: Key Issues and Challenges References Chapter 23: Zinc Abstract 23.1: Introduction 23.2: Recycling Technologies 23.3: Key Issues and Challenges References Chapter 24: Ferroalloy elements Abstract 24.1: Introduction 24.2: Use and Recycling 24.3: Recycling of Residues 24.4: Conclusion References Chapter 25: Precious and technology metals Abstract 25.1: Introduction 25.2: Applications 25.3: Scrap Types and Quantities 25.4: Recycling Technologies 25.5: Future Challenges 25.6: Conclusions and Outlook Further reading References Chapter 26: Concrete and aggregates Abstract Acknowledgment 26.1: Introduction 26.2: Waste Flows 26.3: Recovery Rates 26.4: Recycled Aggregate Concrete Applications 26.5: Concrete Recycling Technologies 26.6: Future Developments 26.7: Conclusion References Chapter 27: Cementitious binders incorporating residues Abstract 27.1: Introduction 27.2: Clinker Production: Process, and Alternative Fuels and Raw Materials 27.3: From Clinker to Cement: Residues in Blended Cements 27.4: Alternative Cements With Lower Environmental Footprint 27.5: Conclusions and Outlook References Chapter 28: Glass Abstract 28.1: Introduction 28.2: Types of Glass 28.3: Manufacturing 28.4: Recovery for Reuse and Recycling 28.5: Reuse 28.6: Closed-Loop Recycling 28.7: Open-Loop Recycling 28.8: Conclusion and Outlook References Chapter 29: Lumber Abstract 29.1: Introduction 29.2: Wood Material Uses 29.3: Postuse Wood Recovery for Recycling 29.4: Postuse Wood Recycling 29.5: Case Study Scenarios 29.6: Future Developments 29.7: Concluding Remarks References Chapter 30: Paper Abstract 30.1: Introduction 30.2: Collection and Utilization 30.3: Collection and Sorting Systems 30.4: Stock Preparation 30.5: Key Issues and Future Challenges References Further Reading Chapter 31: Plastic recycling Abstract 31.1: Introduction 31.2: Use 31.3: Recycling 31.4: Mechanical Recycling 31.5: Chemical Recycling 31.6: Impact of Recycling 31.7: Conclusions and Outlook References Further Reading Chapter 32: Black rubber products Abstract 32.1: Introduction 32.2: Mechanical Rubber Go
    Location: A 18 - must be ordered
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  • 2
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    American Chemical Society
    In:  EPIC3Environmental Science & Technology Letters, American Chemical Society
    Publication Date: 2024-01-24
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 3
    Monograph available for loan
    Monograph available for loan
    Amsterdam : Elsevier
    Call number: M 23.95275
    Type of Medium: Monograph available for loan
    Pages: xvii, 331 Seiten , Illustrationen, Diagramme
    ISBN: 9780128164860
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 4
    Publication Date: 2023-03-13
    Description: Goniodomin A (GDA, 1) is a phycotoxin produced by at least four species of Alexandrium dinoflagellates that are found globally in brackish estuaries and lagoons. It is a linear polyketide with six oxygen heterocyclic rings that is cyclized into a macrocyclic structure via lactone formation. Two of the oxygen heterocycles in 1 comprise a spiro-bis-pyran, whereas goniodomin B (GDB) contains a 2,7-dioxabicyclo[3.3.1]nonane ring system fused to a pyran. When H2O is present, 1 undergoes facile conversion to isomer GDB and to an α,β-unsaturated ketone, goniodomin C (GDC, 7). GDB and GDC can be formed from GDA by cleavage of the spiro-bis-pyran ring system. GDA, but not GDB or GDC, forms a crown ether-type complex with K+. Equilibration of GDA with GDB and GDC is observed in the presence of H+ and of Na+, but the equilibrated mixtures revert to GDA upon addition of K+. Structural differences have been found between the K+ and Na+ complexes. The association of GDA with K+ is strong, while that with Na+ is weak. The K+ complex has a compact, well-defined structure, whereas Na+ complexes are an ill-defined mixture of species. Analyses of in vitro A. monilatum and A. hiranoi cultures indicate that only GDA is present in the cells; GDB and GDC appear to be postharvest transformation products.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 5
    Call number: 9780128171301 (e-book)
    Type of Medium: 12
    Pages: 1 Online-Ressource (786 Seiten) , Illustrationen
    Edition: 2nd edition
    ISBN: 978-0-12-817130-1
    Series Statement: Hazards and disasters series
    Former Title: Snow and ice-related hazards, risks, and disasters (1. Auflage, Druckausgabe)
    Language: English
    Note: Contents Contributors Editorial foreword Preface CHAPTER 1 Snow and ice-related hazards, risks, and disasters: Facing challenges of rapid change and long-term commitments / Wilfried Haeberli and Colin Whiteman 1.1 Introduction 1.2 Costs and benefits: Living with snow and ice 1.3 Small and large, fast and slow, local to global: Dealing with constraints 1.4 Beyond historical experience: Monitoring, modeling, and managing rapid and irreversible changes Acknowledgments References CHAPTER 2 Physical, thermal, and mechanical properties of snow, ice, and permafrost / Lukas Arenson (U.), William Colgan, and Hans Peter Marshall 2.1 Introduction 2.2 Density and structure 2.2.1 Snow 2.2.2 Ice 2.2.3 Frozen ground/permafrost 2.3 Thermal properties 2.3.1 Snow 2.3.2 Ice 2.3.3 Frozen ground 2.4 Mechanical properties 2.4.1 Brittle behavior 2.4.2 Ductile behavior 2.5 Electromagnetic and wave properties 2.5.1 Snow 2.5.2 Ice 2.5.3 Frozen ground 2.6 Summary Acknowledgment References.. CHAPTER 3 Snow and ice in the climate system / Atsumu Ohmura 3.1 Introduction 3.2 Physical extent of the cryosphere 3.3 Climatic conditions of the cryosphere 3.3.1 Snow cover 3.3.2 Sea ice 3.3.3 Permafrost 3.3.4 Glaciers References CHAPTER 4 Snow and ice in the hydrosphere / Jan Seibert, Michal Jenicek, Matthias Huss, Tracy Ewen, and Daniel Viviroli 4.1 Introduction 4.2 Snow accumulation and melt 4.2.1 Snowpack description 4.2.2 Snow accumulation 4.2.3 Snow redistribution, metamorphism, and ripening process 4.2.4 Snowpack development 4.2.5 Snowmelt 4.3 Glaciers and glacial mass balance 4.3.1 Glacier mass balance 4.3.2 Glacial drainage system 4.3.3 Modeling glacier discharge 4.4 Hydrology of snow- and ice-covered catchments 4.4.1 Influence of snow on discharge 4.4.2 Snowmelt runoff and climate change 4.4.3 Influence of glaciers on discharge 4.4.4 River ice 4.4.5 Seasonally frozen soil and permafrost 4.5 Concluding remarks References CHAPTER 5 Snow, ice, and the biosphere / Terry V. Callaghan and Margareta Johansson 5.1 Introduction 5.2 Adaptations to snow, ice, and permafrost. 5.3 Snow and ice as habitats 5.4 Snow as a moderator of habitat 5.4.1 Modification of winter habitat 5.4.2 Modification of nonwinter habitat 5.4.3 Effects of changing snow on the biosphere 5.5 Ice as a moderator of habitat 5.5.1 Mechanical effects of ice 5.5.2 Effects of changing lake and river ice on the biosphere 5.5.3 Effects of changing sea ice on the biosphere 5.6 Permafrost as a moderator of habitat 5.6.1 Effects of changing permafrost on the biosphere 5.6.2 Snow-permafrost-vegetation interactions 5.7 Vegetation as a moderator of snow, ice, and permafrost habitats 5.8 Conclusions Acknowledgments References CHAPTER 6 Ice and snow as land-forming agents / Darrel A. Swift, Simon Cook, Tobias Heckmann, Isabelle Gärtner-Roer, Oliver Korup, and Jeffrey Moore 6.1 Glacial processes and landscapes 6.1.1 Erosion mechanisms and their controls 6.1.2 Landforms and associated hazards 6.1.3 Landscape evolution and rates of glacial incision 6.1.4 Recommended avenues for further research 6.2 Periglacial and permafrost processes and landforms 6.2.1 Landforms and processes related to seasonal frost and permafrost 6.3 The role of snow in forming landscapes 6.3.1 Influence of snow cover on geomorphic processes 6.3.2 Snow-related geomorphic processes and landforms 6.3.3 Potential impacts of global change on snow-related geomorphic processes 6.3.4 Quantifying rates 6.3.5 Modeling 6.4 Conclusions and outlook Acknowledgments References CHAPTER 7 Mountains, lowlands, and coasts: The physiography of cold landscapes / Tobias Bolch and Hanne H. Christiansen 7.1 Introduction 7.2 Physiography of the terrestrial cryosphere 7.2.1 High altitudes/mountains 7.2.2 Cold lowlands 7.2.3 Cold coasts 7.3 Glaciers and ice sheets: Extent and distribution 7.4 Permafrost types, extent, and distribution 7.5 Glacier-permafrost interactions References CHAPTER 8 A socio-cryospheric systems approach to glacier hazards, glacier runoff variability, and climate change / Mark Carey, Graham McDowell, Christian Huggel, Becca Marshall, Holly Moulton, Cesar Portocarrero, Zachary Provant, John M. Reynolds, and Luis Vicuña 8.1 Introduction 8.2 Integrated adaptation in dynamic socio-cryospheric systems 8.3 Glacier and glacial lake hazards 8.3.1 Cordillera Blanca, Peru 8.3.2 Santa Teresa, Peru 8.3.3 Nepal 8.4 Volcano-ice hazards 8.5 Glacier runoff, hydrologic variability, and water use hazards 8.5.1 Nepal 8.5.2 Peru 8.6 Coastal resources and hazards 8.7 Discussion and conclusions Acknowledgments References CHAPTER 9 Integrative risk management: The example of snow avalanches / Michael Bründl and Stefan Margreth 9.1 Introduction 9.2 Risk analysis 9.2.1 Hazard analysis 9.2.2 Exposure and vulnerability analysis 9.2.3 Consequence analysis and calculation of risk 9.3 Risk evaluation 9.3.1 Evaluation of individual risk 9.3.2 Evaluation of collective risk 9.4 Mitigation of risk 9.4.1 Meaning of mitigation of risk 9.4.2 Technical avalanche mitigation measures 9.4.3 Land-use planning 9.4.4 Biological measures and protection forests 9.4.5 Organizational measures 9.5 Methods and tools for risk assessment and evaluation of mitigation measures 9.6 Case study “Evaluation of avalanche mitigation measures for Juneau, Alaska” 9.6.1 Introduction 9.6.2 Avalanche situation 9.6.3 Hazard analysis 9.6.4 Consequence analysis and risk evaluation 9.6.5 Protection measures 9.6.6 Conclusions 9.7 Final remarks References CHAPTER 10 Permafrost degradation / Dmitry Streletskiy 10.1 Introduction 10.2 Drivers of permafrost and active-layer change across space and time 10.2.1 Role of climate: Air temperature and liquid precipitation 10.2.2 Role of topography 10.2.3 Role of vegetation and snow 10.2.4 Role of soil properties 10.3 Observed permafrost and active-layer changes 10.4 Permafrost modeling and forecasting 10.5 Permafrost degradation and infrastructure hazards 10.5.1 Buildings on permafrost 10.5.2 Pipelines on permafrost 10.5.3 Railroads, roads, and utility on permafrost 10.6 Coastal erosion and permafrost 10.7 Summary Acknowledgments References CHAPTER 11 Radioactive waste under conditions of future ice ages / Urs H. Fischer, Anke Bebiolka, Jenny Brandefelt, Denis Cohen, Joel Harper, Sarah Hirschorn, Mark Jensen, Laura Kennell, Johan Liakka, Jens-Ove Näslund, Stefano Normani, Heidrun Stück, and Axel Weitkamp 11.1 Introduction 11.2 Timing of future glacial inception 11.2.1 Introduction 11.2.2 Definition of glacial inception 11.2.3 Controlling factors of glacial inception 11.2.4 Future long-term variations of insolation and atmospheric greenhouse gas concentrations 11.2.5 Modeling of future glacial inception 11.2.6 Timing of future glacial inception and concluding remarks 11.3 The glacier ice-groundwater interface: Constraints from a transect of the modern Greenland Ice Sheet 11.3.1 Background 11.3.2 Basal thermal state 11.3.3 Framework of the ice-bed interface 11.3.4 Basal water 11.3.5 Summary 11.4 Deep glacial erosion in the Alpine Foreland of northern Switzerland 11.4.1 Background 11.4.2 Ice age conditions 11.4.3 Processes of glacial erosion and glacial overdeepening 11.4.4 Water flow in overdeepenings 11.4.5 Deep glacial erosion in the Swiss Plateau 11.4.6 Future research focus 11.5 Tunnel valleys in Germany and their relevance to the long-term safety of nuclear waste repositories 11.5.1 Background 11.5.2 Formation of tunnel valleys 11.5.3 Tunnel valleys in Northern Germany 11.5.4 Tunnel valleys in the German North Sea 11.5.5 Glacial overdeepening in Southern Germany 11.5.6 Impact of tunnel valley formation on host rocks 11.6 Assessment of glacial impacts on geosphere stability and barrier capacity—Canadian perspective 11.6.1 Background 11.6.2 Bruce Nuclear Site—Location and geologic setting Acknowledgments References CHAPTER 12 Snow avalanches / Jürg Schweizer, Perry Bartelt, and Alec van Herwijnen 12.1 Introduction 12.2 The avalanche phenomenon 12.3 Avalanche release 12.3.1 Dry-snow avalanches 1
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  • 6
    Publication Date: 2023-01-16
    Description: The uptake ability toward arsenic(V), chromium(VI), and boron(III) ions of ad hoc functionalized magnetic nanostructured devices has been investigated. To this purpose, ligands based on meglumine have been synthesized and used to coat magnetite nanoparticles (Fe3O4) obtained by the co-precipitation methodology. The as-prepared hybrid material was characterized by infrared spectroscopy (IR), X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy combined with energy-dispersive X-ray analysis. Moreover, its magnetic hysteresis properties were measured to evaluate its magnetic properties, and the adsorption kinetics and isothermal models were applied to discern between the different adsorption phenomena. Specifically, the better fitting was observed by the Langmuir isotherm model for all metal ions tested, highlighting a higher uptake in arsenic (28.2 mg/g), chromium (12.3 mg/g), and boron (23.7 mg/g) sorption values if compared with other magnetic nanostructured materials. After adsorption, an external magnetic stimulus can be used to efficiently remove nanomaterials from the water. Finally the nanomaterial can be reused up to five cycles and regenerated for another three cycles.
    Description: Published
    Description: 10775–10788
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 7
    Publication Date: 2022-12-07
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in James, B., de Vos, A., Aluwihare, L., Youngs, S., Ward, C., Nelson, R., Michel, A., Hahn, M., & Reddy, C. Divergent forms of pyroplastic: lessons learned from the M/V X-Press Pearl ship fire. ACS Environmental Au, 2(5), (2022): 467–479, https://doi.org/10.1021/acsenvironau.2c00020.
    Description: In late May 2021, the M/V X-Press Pearl container ship caught fire while anchored 18 km off the coast of Colombo, Sri Lanka and spilled upward of 70 billion pieces of plastic or “nurdles” (∼1680 tons), littering the country’s coastline. Exposure to combustion, heat, chemicals, and petroleum products led to an apparent continuum of changes from no obvious effects to pieces consistent with previous reports of melted and burned plastic (pyroplastic) found on beaches. At the middle of this continuum, nurdles were discolored but appeared to retain their prefire morphology, resembling nurdles that had been weathered in the environment. We performed a detailed investigation of the physical and surface properties of discolored nurdles collected on a beach 5 days after the ship caught fire and within 24 h of their arrival onshore. The color was the most striking trait of the plastic: white for nurdles with minimal alteration from the accident, orange for nurdles containing antioxidant degradation products formed by exposure to heat, and gray for partially combusted nurdles. Our color analyses indicate that this fraction of the plastic released from the ship was not a continuum but instead diverged into distinct groups. Fire left the gray nurdles scorched, with entrained particles and pools of melted plastic, and covered in soot, representing partial pyroplastics, a new subtype of pyroplastic. Cross sections showed that the heat- and fire-induced changes were superficial, leaving the surfaces more hydrophilic but the interior relatively untouched. These results provide timely and actionable information to responders to reevaluate cleanup end points, monitor the recurrence of these spilled nurdles, gauge short- and long-term effects of the spilled nurdles to the local ecosystem, and manage the recovery of the spill. These findings underscore partially combusted plastic (pyroplastic) as a type of plastic pollution that has yet to be fully explored despite the frequency at which plastic is burned globally.
    Description: This work was supported by the Postdoctoral Scholar Program at the Woods Hole Oceanographic Institution (WHOI), with funding provided by the Weston Howland Jr. Postdoctoral Scholarship. Additional support was provided by the WHOI Marine Microplastics Catalyst Program, the WHOI Marine Microplastics Innovation Accelerator Program, the WHOI Investment in Science Fund, the March Marine Initiative (a program of March Limited, Bermuda), The Seaver Institute, Gerstner Philanthropies, the Wallace Research Foundation, the Richard Saltonstall Charitable Foundation, the Harrison Foundation, Hollis and Ermine Lovell Charitable Foundation, and the Richard Grand Foundation. AdV was supported by funding from the Schmidt Foundation.
    Keywords: Microplastic ; Resin pellets ; Pollution ; Additives ; Open burning ; Weathering ; Maritime accident
    Repository Name: Woods Hole Open Access Server
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  • 8
    Publication Date: 2022-10-26
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Walsh, A. N., Reddy, C. M., Niles, S. F., McKenna, A. M., Hansel, C. M., & Ward, C. P. Plastic formulation is an emerging control of its photochemical fate in the ocean. Environmental Science & Technology, 55(18), (2021): 12383–12392, https://doi.org/10.1021/acs.est.1c02272.
    Description: Sunlight exposure is a control of long-term plastic fate in the environment that converts plastic into oxygenated products spanning the polymer, dissolved, and gas phases. However, our understanding of how plastic formulation influences the amount and composition of these photoproducts remains incomplete. Here, we characterized the initial formulations and resulting dissolved photoproducts of four single-use consumer polyethylene (PE) bags from major retailers and one pure PE film. Consumer PE bags contained 15–36% inorganic additives, primarily calcium carbonate (13–34%) and titanium dioxide (TiO2; 1–2%). Sunlight exposure consistently increased production of dissolved organic carbon (DOC) relative to leaching in the dark (3- to 80-fold). All consumer PE bags produced more DOC during sunlight exposure than the pure PE (1.2- to 2.0-fold). The DOC leached after sunlight exposure increasingly reflected the 13C and 14C isotopic composition of the plastic. Ultrahigh resolution Fourier transform ion cyclotron resonance mass spectrometry revealed that sunlight exposure substantially increased the number of DOC formulas detected (1.1- to 50-fold). TiO2-containing bags photochemically degraded into the most compositionally similar DOC, with 68–94% of photoproduced formulas in common with at least one other TiO2-containing bag. Conversely, only 28% of photoproduced formulas from the pure PE were detected in photoproduced DOC from the consumer PE. Overall, these findings suggest that plastic formulation, especially TiO2, plays a determining role in the amount and composition of DOC generated by sunlight. Consequently, studies on pure, unweathered polymers may not accurately represent the fates and impacts of the plastics entering the ocean.
    Description: Funding was provided by the Seaver Institute, the Gerstner Family Foundation, Woods Hole Oceanographic Institution, and the National Science Foundation Graduate Research Fellowship Program (A.N.W.). The Ion Cyclotron Resonance user facility at the National High Magnetic Field Laboratory is supported by the National Science Foundation Division of Chemistry and Division of Materials Research through DMR-1644779 and the State of Florida.
    Keywords: Plastic pollution ; Marine debris ; Additives ; Dissolved organic carbon ; Photochemical oxidation ; FT-ICR-MS ; Titanium dioxide
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 9
    Publication Date: 2022-10-21
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Colson, B. C., & Michel, A. P. M. Flow-through quantification of microplastics using impedance spectroscopy. ACS Sensors, 6(1), (2021): 238–244, doi:10.1021/acssensors.0c02223.
    Description: Understanding the sources, impacts, and fate of microplastics in the environment is critical for assessing the potential risks of these anthropogenic particles. However, our ability to quantify and identify microplastics in aquatic ecosystems is limited by the lack of rapid techniques that do not require visual sorting or preprocessing. Here, we demonstrate the use of impedance spectroscopy for high-throughput flow-through microplastic quantification, with the goal of rapid measurement of microplastic concentration and size. Impedance spectroscopy characterizes the electrical properties of individual particles directly in the flow of water, allowing for simultaneous sizing and material identification. To demonstrate the technique, spike and recovery experiments were conducted in tap water with 212–1000 μm polyethylene beads in six size ranges and a variety of similarly sized biological materials. Microplastics were reliably detected, sized, and differentiated from biological materials via their electrical properties at an average flow rate of 103 ± 8 mL/min. The recovery rate was ≥90% for microplastics in the 300–1000 μm size range, and the false positive rate for the misidentification of the biological material as plastic was 1%. Impedance spectroscopy allowed for the identification of microplastics directly in water without visual sorting or filtration, demonstrating its use for flow-through sensing.
    Description: The authors thank the Richard Saltonstall Charitable Foundation and the National Academies Keck Futures Initiative (NAKFI DBS13) for their funding support.
    Keywords: Microplastics ; Plastics ; Impedance spectroscopy ; Dielectric properties ; Instrumentation ; Particle detection ; Flow-through ; Environmental sensing
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 10
    Monograph available for loan
    Monograph available for loan
    Amsterdam : Elsevier
    Associated volumes
    Call number: 9454
    In: Developments in solid earth geophysics
    Type of Medium: Monograph available for loan
    Pages: 563 Seiten
    ISBN: 0444412220
    Series Statement: Developments in solid earth geophysics 7
    Language: English
    Location: Upper compact magazine
    Branch Library: GFZ Library
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