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Phosphate Sorption In Single And Mixed Fe And Al Oxide Systems
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Book Synopsis Phosphate Sorption in Single and Mixed Fe- and Al-oxide Systems by : Nidhi Khare
Download or read book Phosphate Sorption in Single and Mixed Fe- and Al-oxide Systems written by Nidhi Khare and published by . This book was released on 2003 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: phosphorus, ferrihydrite, boehmite, non-crystalline aluminum hydroxide, goethite, XANES, XAFS, adsorption.
Book Synopsis Phosphate Sorption in Single and Mixed Fe- and Al-oxide Systems by :
Download or read book Phosphate Sorption in Single and Mixed Fe- and Al-oxide Systems written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The interaction of phosphate with Fe(III) and Al(III) is important in soils, wastes and other systems of environmental significance. The goal of this research was to characterize phosphate sorption in single- and mixed Fe- and Al-oxide systems using XANES (X-ray absorption near edge structure spectroscopy). The specific objectives of this research were: 1) To determine the quantitative distribution of phosphate between Fe-and Al-oxide minerals in mixtures containing these minerals; 2) To assign XANES spectral features for phosphate associated with Fe(III) or Al(III) to specific electronic transitions; and 3) To characterize adsorption versus surface precipitation in single- and binary mixtures of Fe- and Al-oxide minerals. Phosphate was sorbed in single-mineral aqueous suspensions of ferrihydrite (ferric hydroxide), boehmite (aluminum oxyhydroxide), goethite (iron oxyhydroxide), or non-crystalline (non-xl) Al-hydroxide, and mixtures of ferrihydrite/boehmite, goethite/boehmite, and ferrihydrite/non-xl Al-hydroxide at pH 6. Samples were reacted at 22 degrees Celsius for 42 h. Phosphate sorption isotherm trends for mixed-mineral systems were L-curves and were intermediate to those of the respective minerals in the mixture. Phosphorus K-XANES spectra for phosphate on Fe- vs. Al-oxide minerals differed in that a weak doublet peak was observed for Fe-oxides on the low-energy side of the P K-edge, i.e., in the pre-edge region. The quantitative distribution of phosphate between ferrihydrite and boehmite in mixtures of these minerals was determined using linear combination fitting (LCF) analysis of the XANES pre-edge region. Results showed that phosphate essentially distributed itself in proportion to the maximum phosphate sorption capacity of each of these minerals. Using a XANES fitting procedure, phosphate was found to show a greater apparent preference for boehmite and non-xl Al-hydroxide minerals in goethite/boehmite and ferrihydrite/non-xl Al-hydroxide mixtures, respec.
Book Synopsis The Environmental Chemistry of Aluminum by : Garrison Sposito
Download or read book The Environmental Chemistry of Aluminum written by Garrison Sposito and published by CRC Press. This book was released on 2020-04-08 with total page 477 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Environmental Chemistry of Aluminum provides a comprehensive, fundamental account of the aqueous chemistry of aluminum within an environmental context. An excellent reference for environmental chemists and scientific administrators of environmental programs, this book contains material reflecting the many recent changes in this rapidly developing discipline. The first three chapters discuss the most fundamental aspects of aluminum chemistry: its quantitation in soils and natural waters, including speciation measurements, and its stable chemical forms, both as a dissolved solute and in a solid phase. These chapters emphasize both critical assessments of and definitive recommendations for laboratory methodologies and measured thermodynamic properties relating to aluminum chemistry. The next four chapters in The Environmental Chemistry of Aluminum build on this foundation to provide details of the polymeric chemistry of aluminum: its polynuclear and colloidal hydrolytic species in aqueous solution, its complexes with natural organic ligands, including humic substances, and its role as an adsorptive and adsorbent in surface reactions. These chapters are grounded in experimental results rather than conceptual modeling. The final three chapters describe the chemistry of aluminum in soils, waters, and watersheds. These chapters illustrate the problems of spatial and temporal variability, metastability, and scale that continue to make aluminum geochemistry one of the great challenges in modern environmental science.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2005 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissolution of Phosphate in Mixed Fe- and Al-oxide Mineral Suspensions as Influenced by Reducing Conditions by :
Download or read book Dissolution of Phosphate in Mixed Fe- and Al-oxide Mineral Suspensions as Influenced by Reducing Conditions written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Crests & Badges of the British Army, Etc by :
Download or read book Crests & Badges of the British Army, Etc written by and published by . This book was released on 1960 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Chemical Model of Phosphate Adsorption on Oxide Minerals and Soils by : Sabine Ruth Goldberg
Download or read book A Chemical Model of Phosphate Adsorption on Oxide Minerals and Soils written by Sabine Ruth Goldberg and published by . This book was released on 1983 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Phosphate Sorption and Desorption Characteristics in Soil Systems Determined with a Polynuclear-Al-saturated Cation Exchange Resin by : Yingming Liang
Download or read book Phosphate Sorption and Desorption Characteristics in Soil Systems Determined with a Polynuclear-Al-saturated Cation Exchange Resin written by Yingming Liang and published by . This book was released on 1988 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Role of Dissolved Organic Matter on Phosphrous [sic] Sorption Onto Iron-enhanced Activated Alumina Media Using In-field and Flow-through Column Experiments by : Umme Fatema
Download or read book The Role of Dissolved Organic Matter on Phosphrous [sic] Sorption Onto Iron-enhanced Activated Alumina Media Using In-field and Flow-through Column Experiments written by Umme Fatema and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Western Lake Erie Basin (WLEB) has been experiencing harmful algal blooms due to increases in dissolved reactive phosphorous (DRP) from agricultural land in the Maumee River watershed. Agricultural best management practices (BMPs) can be useful to mitigate the DRP loads; nevertheless, DRP is not always fully removed by in-field BMPs. Phosphorous (P) removal structures can be filled with phosphorus sorption materials (PSM) such as iron and aluminum oxides and can be placed at the junction of runoff and subsurface drainage to trap DRP from tile drainage. However, dissolved organic matter (DOM) from the agricultural farmland might compete with phosphate ions (PO43-) at the adsorption sites in the media, reducing its lifetime and efficiency. Therefore, laboratory flow-through column experiments were conducted to determine whether DOM is affecting P sorption onto iron enhanced activated alumina media (Alcan). The experiments were informed by field data collected from a regional farm. Alcan (Al/ Fe (hydro) oxides) media was efficient in removing PO43- coming into the filtering system and thereby, flow-through column experiments were able to determine a discrete P removal percentage efficiency of 83.32%, 68.26%, 66.54%, 57.16% and 41.27% by the end of treatment I (5mg L-1 PO43- only), treatment II (5mg L-1 PO43- and 5 mg L-1 DOM), treatment III (5mg L-1 PO43- and 10 mg L-1 DOM), treatment IV (5mg L-1 PO43- and 20 mg L-1 DOM), and treatment V (10mg L-1 PO43- and 20 mg L-1 DOM), respectively. Moreover, from exponential regression analysis of P removal curves for each treatment, it was measured that a total cumulative of 231.45 gm, 92.65 gm, 92.06 gm, 65.998 gm and 91.476 gm of P per kg PSM can be added to treatment I, II, III, IV and V, respectively, until the media gets fully saturated, i.e., concentration of influent PO43- would be equal to the effluent PO43- concentrations. It is evident that DOM is competing with PO43- decreasing PO43- sorption onto the Alcan media. Plausible geochemical mechanisms involved in the competitive sorption between DOM and PO43- onto the media include surface protonation and ligand exchange. The change in pH, concentration of influent PO43- and DOM throughout the length of the experiments was crucial on suggesting the adsorption mechanisms of both DOM and PO43-.
Book Synopsis Processes and Factors Affecting Phosphorus Sorption in Soils by : Samuel Asomaning
Download or read book Processes and Factors Affecting Phosphorus Sorption in Soils written by Samuel Asomaning and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subject of this chapter is soil chemistry. The chapter is entitled Processes and Factors Affecting Phosphorus (P) Adsorption in Soils. The chapter aims to give an overview of the major mechanisms responsible for phosphate sorption (i.e., adsorption and absorption of phosphate) in soils, particularly of acid soils. According to studies conducted by some soil scientists, the major soil factors affecting P sorption are time, soil pH, soil organic matter, and iron and aluminium oxides of soils. Studies conducted indicated that adsorption of the P increases as the P ages in the soil. Soil pH affects phosphate adsorption but the effect is limited for adsorption by soils in the pH range of 4,Äì8. Organic matter may affect P adsorption in two ways: indirectly by inhibiting iron oxide crystallisation and directly by competing for adsorption sites. On per mole basis, oxalate extractable aluminium oxides adsorb nearly twice as much P as oxalate extractable iron oxides due to poorer crystallinity (higher specific area) of the aluminium oxides compared to the iron oxides and also to a higher charge of the former. The chapter also highlights the pedotransfer functions (PTFs) of Borggaard, which can be used to calculate for the P adsorption in highly weathered acid soils.
Book Synopsis Role of Fe-oxides for Predicting Phosphorus Sorption in Calcareous Soils by : Mehruinsa Memon
Download or read book Role of Fe-oxides for Predicting Phosphorus Sorption in Calcareous Soils written by Mehruinsa Memon and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Agronomic efficiency and management of environmental P inputs can be improved by understanding soil-phosphorus interaction. Iron oxides and other clay minerals, P forms, and P sorption in young alluvial and weathered residual soils were determined. Phosphorus retention related to crystallinity and phase distribution of iron oxides. CBD and oxalate extractable iron and aluminum and smectite and kaolinite explained 90% variation while soil CaCO3 role was only insignificant in explaining P sorption.
Book Synopsis The Reaction of Phosphate with Mineral Surfaces and Iron Oxide Gels by : Arnold Gerhard Scholten
Download or read book The Reaction of Phosphate with Mineral Surfaces and Iron Oxide Gels written by Arnold Gerhard Scholten and published by . This book was released on 1965 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Relation Between Phosphate Sorption and Aggregation in Oxisols from Brazil by : Jose Maria De Lima
Download or read book Relation Between Phosphate Sorption and Aggregation in Oxisols from Brazil written by Jose Maria De Lima and published by . This book was released on 1995 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characterization of Sorption Sites for Phosphate by : Wayne P. Robarge
Download or read book Characterization of Sorption Sites for Phosphate written by Wayne P. Robarge and published by . This book was released on 1975 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Phosphorus in Action by : Else K. Bünemann
Download or read book Phosphorus in Action written by Else K. Bünemann and published by Springer Science & Business Media. This book was released on 2010-11-08 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phosphorus (P) is a finite resource which is essential for life. It is a limiting nutrient in many ecosystems but also a pollutant which can affect biodiversity in terrestrial ecosystems and change the ecology of water bodies. This book collects the latest information on biological processes in soil P cycling, which to date have remained much less understood than physico-chemical processes. The methods section presents spectroscopic techniques and the characterization of microbial P forms, as well as the use of tracers, molecular approaches and modeling of soil-plant systems. The section on processes deals with mycorrhizal symbioses, microbial P solubilization, soil macrofauna, phosphatase enzymes and rhizosphere processes. On the system level, P cycling is examined for grasslands, arctic and alpine soils, forest plantations, tropical forests, and dryland regions. Further, P management with respect to animal production and cropping, and the interactions between global change and P cycling, are treated.
Book Synopsis Challenges and Successes in Identifying the Transfer and Transformation of Phosphorus from Soils to Open Waters and Sediments by : Donald S. Ross
Download or read book Challenges and Successes in Identifying the Transfer and Transformation of Phosphorus from Soils to Open Waters and Sediments written by Donald S. Ross and published by . This book was released on 2021 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: The anthropogenic loading of phosphorus (P) to water bodies continues to increase worldwide, in many cases leading to increased eutrophication and harmful algal blooms. Determining the sources of P and the biogeochemical processes responsible for this increase is often difficult because of the complexity of the inputs and pathways, which vary both in spatial and temporal scales. In order to effectively develop strategies to improve water quality, it is essential to develop a comprehensive understanding of the relationship of P pools with biological uptake and cycling under varied soil and water conditions. In this ebook, eight chapters cover the various aspects of basic-applied research on mineral-P interaction and how these reactions impact P mobilization, bioavailability, transfer, and speciation of P in different soil matrices using advanced analytical methods. Some of these methods include the application of XANES and field-based research related to stream bank legacy nutrients; natural and anthropogenic eutrophication and its relationship to climate change; and the evaluation of the impact of P due to (i) grazing systems, (ii) weathering and vegetation, and iii) soil and manure management practices. In addition, two review chapters take a holistic approach to cover an expansive area of P transformation processes along the cropland-riparian-stream continuum and the assessment of legacy P. Together, these contributions improve our current understanding of the reactions and processes that impact P concentration, speciation, cycling, loss, and transfer from agroecosystems.
Book Synopsis Mineral-Water Interface Geochemistry by : Michael F. Hochella
Download or read book Mineral-Water Interface Geochemistry written by Michael F. Hochella and published by Walter de Gruyter GmbH & Co KG. This book was released on 2018-12-17 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 23 of Reviews in Mineralogy and accompanying MSA short course covers chemical reactions that take place at mineral-water interfaces. We believe that this book describes most of the important concepts and contributions that have driven mineral-water interface geochemistry to its present state. We begin in Chapter 1 with examples of the global importance of mineral-water interface reactions and a brief review of the contents of the entire book. Thereafter, we have divided the book into four sections, including atomistic approaches (Chapters 2- 3), adsorption (Chapters 4-8), precipitation and dissolution (Chapters 9-11), and oxidation-reduction reactions (Chapters 11-14).
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