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  • 1
    Online Resource
    Online Resource
    Hauppauge :Nova Science Publishers, Incorporated,
    Keywords: Mercury -- Research. ; Mercury -- Health aspects. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (274 pages)
    Edition: 1st ed.
    ISBN: 9781622577248
    Series Statement: Chemistry Research and Applications
    DDC: 546/.663
    Language: English
    Note: Intro -- MERCURY -- MERCURY -- Contents -- Preface -- Structural Aspects of Mercury Complexes -- Abstract -- 1. Introduction -- 2. Mercury Coordination Complexes -- 2.1. Monomeric Coordination Complexes -- 2.2.Dimeric Coordination Compounds -- 2.2.1 DimericHg(I) Coordination Compounds -- 2.2.2 DimericHg(II) Coordination Compounds -- 2.3.Oligomeric Mercury Coordination Compounds -- 2.4.Polymeric Mercury Coordination Compounds -- 3. Mercury Organometallic Complexes -- 3.1. Monomeric Organometallic Mercury Complexes -- 3.2. Dimeric Organometallic Mercury Complexes -- 3.3. TrimericOrganomercury Complexes -- 3.4. Oligo- and Polymeric Organomercury(ii) Complexes -- 4. Heterometallic Mercury Complexes -- 4.1. Hetero - Double Salts -- 4.2. Heterodimeric Mercury Complexes -- 4.3. Heterotrimeric Mercury Complexes -- 4.4. Heterotetrameric Mercury Complexes -- 4.5. Heterooligomeric Mercury Complexes -- 4.6. Heteropolymeric Mercury Complexes -- 5. Isomers in the Chemistry of Mercury Complexes -- 5.1. Mercury Coordination Complexes - Isomerism -- 5.1.1. Distortion Isomerism -- 5.1.2. Polymerization Isomerism -- 5.1.3. Coordination Number Isomerism -- 5.1.4. Ligand Isomerism -- 5.2. Organometallic Mercury Complexes - Isomerism -- 5.2.1. Distortion Isomers -- 5.2.2. Ligand Isomers -- 5.3. Mercury Heterometallic Complexes -Isomerism -- 5.3.1. Distortion Isomers -- 5.3.2. Linkage Isomers -- Conclusion -- References -- Organic-Inorganic Mesoporous Monolithic Scaffolds and Their Functionality in the Optical Ion-Sensitive Removal of Mercury Ions -- Aim of the Chapter -- Mercury -- Mercury in the Environment -- Global Mercury Cycle in the Environment -- Toxicity of Mercury -- Mercury Removal Technologies -- Adsorption -- Activated Carbon -- Bioadsorbents -- Other Adsorption Processes -- Ion Exchange -- Chemical Reduction -- Precipitation -- Coagulation. , Membrane Separation -- Sensor -- Optical Chemical Sensors -- Optical Chemical Sensors Based on Nanomaterials -- Optical Chemical Sensors Based on Fluorescent Chemosensors -- Optical Sensors Based on Colorimetric Probes -- Design of Optical Sensor Probes -- Advantages of the Hg(II) Ion-Optical Sensors -- 1. Simple Workability for Ultratrace Detection -- 2. pH-Dependence for Sensitive Signaling Response -- 3. Ion-Selectivity System for Stripping of Hg (II) Ion among Competitive Matrices -- 4. Reducibility and Reversibility of Optical Sensors -- Conclusion and Outlook -- References -- Isomers in the Chemistry of Mercury Organometallic and Heterometallic Complexes -- ABSTRACT -- Abbreviations -- 1. Introduction -- 2. Mercury Organometallics -- 2.1. Distortion Isomers -- 2.1.1. Pair of Isomers -- 2.1.2. Independent Molecules - Monomers -- 2.1.3. Independent Molecules - Di-, Tri-, Tetra- and Polymeric -- 2.2. Ligand Isomers -- 2.3. Isomers Evoke by Temperature -- 3. Mercury Heterometallic Complexes -- 3.1. Distortion Isomers -- 3.2. Linkage Isomers -- Conclusion -- Acknowledgments -- References -- Generation of Superoxide by the Interaction between Mercury Ions and Endogenous Thiols -- Abstract -- 1. Introduction -- 2. Preparation of the Mercury-Containing Thiol Complexes -- 3. Capacity of the Mercury-Containing Thiol Complexes to Generate Superoxide -- 3.1. EPR Studies -- 3.2. Dihydroethidium Oxidation Experiments -- 3.3. Cytochrome c Reduction Experiments -- 4. Capacity of the Mercury-Containing Thiol Complexes to Generate Hydrogen Peroxide -- 4.1. Acetaminophen Oxidation Experiments -- 5. Capacity of the Mercury-Containing Thiol -- Complexes to Generate Oxidized Thiols -- Conclusion -- Acknowledgments -- References -- Effects of Acute Mercury Exposition on the Expression and Function of Organic Anion Transporters in the KidneyS -- Abstract. , Introduction -- Chemical Forms of Mercury -- Pharmacokinetics of Mercury -- Mercury and the Kidneys -- Membrane Transporters -- Oat1 and Oat3 -- Oat5 -- Acknowledgments -- References -- Mercury: Environmental Concerns and Management Technologies -- Abstract -- 1. Introduction -- 2. Mercury and its Compounds -- 3. The Cycle of Mercury in Nature and its Sources -- 4. Effects of Mercury on Health -- 5. Legislation on Mercury -- 6. Technologies for the Treatment of Mercury and Mercury-Containing Wastes -- 6.1. Thermal Treatments -- 6.2. Immobilization Technologies -- 6.2.1. Amalgamation -- 6.2.2. Stabilization/Solidification (S/S) with Sulfur And and Selenium -- 6.2.3. Encapsulation -- 6.2.3.1. Encapsulation without Pozzolanic Materials -- 6.2.3.2. Encapsulation with Pozzolanic Materials -- 6.2.3.3. Encapsulation with Thermoplastic Materials -- 6.2.4. Vitrification -- 7. Corollaly -- Acknowledgments -- References -- Mercury Toxicity Alters The Antioxidant System of Growing Cucumber Seedlings -- Abstract -- 1. Introduction -- 2. Material and Methods -- 2.1. Plant Material and Growth Conditions -- 2.2. Determination of Electrolyte Leakage Percentage -- 2.3. Determination of Hydrogen Peroxide -- 2.4. Superoxide Dismutase (E.C 1.15.1.1) -- 2.5. Non-Protein Thiol Content -- 2.6. Ascorbic Acid Content -- 2.7. Carotenoids Determination -- 2.8. Estimation of Delta-Aminolevulinic Acid Dehydratase (ALA-D -- E.C. 4.2.1.24) Activity -- 2.9. Protein Determination -- 2.10. Statistical Analysis -- 3. Results -- 3.1. Electrolyte Leakage Percentage and Hydrogen -- Peroxide Content -- 3.2. Superoxide Dismutase Activity -- 3.3. Concentration of Antioxidants Compounds -- 3.4. Cotyledons (-ALA-D Activity -- 4. Discussion -- Acknowledgments -- References. , Mercury and its Connection with Physicochemical Water Parameters (Case Study of the Rivers of the Northern European Territory of Russia) -- Abstract -- Methods of Taking, Preparing, and Analyzing Samples -- Analysis and Description of Physico-Chemical Parameters' Behavior -- Analysis and Description of Total Dissolved Mercury Behavior -- Relative Content of Mercury Dissolved in Near Bottom Water Layer -- Conclusion -- Acknowledgments -- References -- Mercury Contamination in Reptiles: An Emerging Problem with Consequences for Wild Life and Human Health -- Abstract -- 1. Introduction -- 2. Mercury: Species and Sources -- 2.1. Mercury Species and Toxicity -- 2.2. Mercury Origins -- 2.3. Considerations of Mercury Origins and Effects on the Use of -- Wildlife as Biomonitors -- 2.4. Why Some Reptiles are Good Mercury Bioindicators? -- 3. Mercury Accumulation in Reptiles: A Health Issue -- 3.1. Historical Use of Reptiles for Human Consumption -- 3.2. Legal and Illegal Trade of Reptiles for Food and Their Potential as Sources of Mercury to Humans -- 4. Environmental and Biological Factors Affecting Mercury Bioaccumulation -- 4.1. Environmental Factors -- 4.1.1. Dissolved Organic Carbon -- 4.1.2. pH -- 4.1.3. Dissolved Oxygen -- 4.1.4. Availability of Methylation Sites -- 4.1.5. Selecting a Suitable Focal Species -- 4.2. Biological Factors -- 4.2.1. Diet -- 4.2.2. Gender -- 4.2.3. Age and Size -- 5. Mercury Bioacumulation: Diet and Trophic -- Level Comparisons -- 5.1. Mercury Bioaccumulation in Reptiles -- 5.2. Reptile Diets -- 5.3. Mercury Concentrations in Reptiles and Their Position in Food Webs -- 6. Toxicokinetics of Mercury in Reptiles -- 6.1. Fate of Hg within Organs -- 6.2. Fate of Mercury at the Subcellular Level -- 7. Consequences for Wildlife -- 7.1. Embryos -- 7.2. Juveniles and Adults -- 7.3. Predators of Reptiles. , 8. Implications for Human Health -- 8.1. Risk-Based Consumption Limits -- 8.2. Developmental Neurotoxicity -- 8.3. Neurotoxicity in Adults -- 8.4. Cardiovascular Effects -- 9. Non Invasive Techniques to Study Mercury Bioaccumulation in Reptiles -- Summary and Concluding Remarks -- References -- Atmospheric Deposition of Mercury from Waites Island, Horry County, South Carolina, as compared to Regional mercury deposition and South Carolina Fish Consumption Advisories -- Abstract -- Introduction -- Experimental Methods -- Site Location -- Sample Collection -- Sample Analysis -- Results and Discussion -- Rainfall in South Carolina -- Comparison to Regional Rainfall and SC Fish Consumption Advisories -- Conclusion -- Acknowledgments -- References -- Index.
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  • 2
    Publication Date: 2021-05-12
    Description: On December 29, 2013, an isolated vulcanian-type eruption occurred at Chaparrastique volcano (El Salvador) after 12 years of inactivity. The eruption was classified as VEI 2 and produced an ash plume with a maximum height of ~9 km. Textural and compositional data fromphenocrysts fromthe erupted products have been inte- grated with geochemical and isotopic information frombulk rocks to elucidate the magmatic processes respon- sible for the reawakening of volcanic activity. Phenocrysts consist of Fo-rich poikilitic olivines hosting high-Mg titanomagnetites, and Fo-poor olivines coexisting with low-Mg titanomagnetites.Mineral-melt equilibria suggest an origin for the distinct phenocryst populations by mixing between a high-T (~1130–1150 °C), basaltic magma with fO2 (NNO buffer) typical of the lower crust inarc systems and a low-T (~1060–1080 °C), basaltic andesiticmagma with fO2 (NNO+1 buffer) commonly encountered in shallower, more oxidized crustal reservoirs. Thermobarometry based on Fe-Mg ex- change between orthopyroxene and clinopyroxene constrains the crystallization before eruption at relative low-P (~150–250MPa) and low-T (~1000–1050 °C).Mixing between twochemically distinctmagmas is also ev- idenced by the occurrence of reverse zoned plagioclase phenocrysts with resorbed sodic cores and re-growth of sieve-textured calcicmantles. Conversely, plagioclase rims exhibit disequilibriumcompositions addressed to de- compression kinetics (~10−3 MPa/s) driven by rapidmagma ascent to the surface (~0.03 m/s). Major and trace element modelling excludes fractional crystallization as the primarymechanismcontrolling the bulk rock variability,whereas geochemical data align along amixing trend between two end-members represen- tative of the primitive basalt and the differentiated basaltic andesite. Trace element and isotope data indicate that the primary source of magmatism is an enriched MORB-like mantle with the contribution of fluxes ofmetaso- matic fluids and/ormelts produced by the subducted slab. The roleplayed by slab-fluid inputs of carbonate origin and slab-melts fromthe hemipelagic sediments seems to beminimal. Assimilation/contamination processes of magmas by crustal rocks are also negligible. In contrast, the geochemical signature of magmas is greatly influ- enced by slab-derived aqueous fluids produced prevalently by progressive dehydration of marine sediments and altered basaltic crust
    Description: Published
    Description: 110-122
    Description: 3V. Proprietà dei magmi e dei prodotti vulcanici
    Description: 4V. Dinamica dei processi pre-eruttivi
    Description: 5V. Dinamica dei processi eruttivi e post-eruttivi
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
    Publication Date: 2022-04-22
    Description: New geochemical and isotopic data on volcanic rocks spanning the period ~75–50 ka BP on Ischia volcano, Italy, shed light on the evolution of the magmatic system before and after the catastrophic, caldera-forming Monte Epomeo Green Tuff (MEGT) eruption. Volcanic ac tivity during this period was influenced by a large, composite and differentiating magmatic system, replenished several times with isotopically distinct magmas of deepprovenance. Chemical and isotopic variations highlight that the pre-MEGT eruptions were fed by trachytic/phonolitic magmas from an isotopically zoned reservoir that were poorly enriched in radiogenic Sr and became progressively less radiogenic with time. Just prior to the MEGT eruption, the magmatic system was recharged by an isotopically distinct magma, relatively more enriched in radiogenic Sr with respect to the previously erupted magmas. This second magma initially fed several SubPlinian explosive eruptions and later supplied the climactic, phonolitic-to-trachytic MEGT eruption(s). Isotopic data, together with erupted volume estimations obtained for MEGT eruption(s), indicate that 〉5–10 km3of this relatively enriched magma had accumulated in the Ischia plumbing system. Geochemical modelling indicates that it accumulated at shallow depths (4–6 km), over a period of ca. 20 ka. After the MEGT eruption, volcanic activity was fed by a new batch of less differentiated (trachyte-latite) magma that was slightly less enriched in radiogenic Sr. The geochemical and Sr–Nd-isotopic variations through time reflect the upward flux of isotopically distinct magma batches, variably contaminated byHercynian crust at 8–12 km depth. The deep-sourced latitic to trachytic magmas stalled at shallow depths (4–6 km depth), differentiated to phonolite through crystal fractionation and assimilation of a feldspar-rich mush, or ascended directly to the surface and erupted.
    Description: Published
    Description: 1035
    Description: 2V. Struttura e sistema di alimentazione dei vulcani
    Description: 3V. Proprietà chimico-fisiche dei magmi e dei prodotti vulcanici
    Description: 4V. Processi pre-eruttivi
    Description: 6A. Geochimica per l'ambiente e geologia medica
    Description: JCR Journal
    Keywords: Ischia volcano ; Magmatic plumbing system ; Radiogenic isotopes ; Geothermometry ; Feldspar assimilation ; Caldera collapse
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
    Publication Date: 2022-02-25
    Description: The 56 ka Monte Epomeo Green Tuff (MEGT) resulted from the largest volume explosive eruption from Ischia island (south Italy). Its tephra is one of the main stratigraphic markers of the central Mediterranean area. Despite its importance, a detailed characterisation of the petrography and mineral chemistry of MEGT is lacking. To fill this gap, we present detailed petrographic description and electron microprobe mineral chemistry data on samples collected on-land from the MEGT. Juvenile clasts include pumice, scoria, and obsidian fragments with porphyritic/glomeroporphyritic, vitrophyric, and fragmental textures. The porphyritic index is 13–40 vol.%, and phenocryst phases include alkali-feldspar, plagioclase, clinopyroxene, ferrian phlogopite, and titano-magnetite, in order of decreasing abundance; accessory phases include sphene, hydroxy-fluor-apatite, and rare edenite. Plagioclase varies from predominant andesine to subordinate oligoclase, whereas alkali-feldspar is more variable from sanidine to anorthoclase; quasi-pure sanidine commonly occurs as either rim or recrystallisation overgrowth of large phenocrysts due to hydrothermal alteration. Secondary minerals include veins and patches of carbonate minerals, Fe-Mn oxyhydroxides, clay minerals, and zeolites. Clinopyroxene is ferroan diopside (En45–29Fs7–27) and never reaches Na-rich compositions. This feature allows the discrimination of MEGT from aegirine-bearing, distal tephra layers erroneously attributed to MEGT, with implications for the areal distribution of Ischia explosive deposits
    Description: Published
    Description: 955
    Description: 6A. Geochimica per l'ambiente e geologia medica
    Description: JCR Journal
    Keywords: Monte Epomeo Green Tuff ; Ischia island ; petrography ; mineral chemistry ; clinopyroxene ; tephrostratigraphy ; tephrochronology ; Mediterranean
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 5
    Publication Date: 2021-12-15
    Description: The 40 ka caldera-forming eruption of Campi Flegrei (Italy) is the largest known erup- tion in Europe during the last 200 k.y., but little is known about other large eruptions at the volcano prior to a more recent caldera-forming event at 15 ka. At 29 ka a widespread volcanic ash layer, termed the Y-3 tephra, covered 〉150,000 km2 of the Mediterranean. The glass compositions of the layer are consistent with Campi Flegrei being the source, but no prominent proximal equivalent in the appropriate chrono-stratigraphic position had been previously identified. Here we report new glass chemistry data and 40Ar/39Ar ages (29.3 ± 0.7 ka [2σ]) that reveal the near-source Y-3 eruption deposit in a sequence at Ponti Rossi and a nearby borehole (S-19) in Naples. The dispersal and thickness of the deposits associ- ated with this eruption, herein named the Masseria del Monte Tuff, were simulated using a tephra sedimentation model. The model indicates that ~16 km3 dense rock equivalent of the magma erupted was deposited as fall. This volume and the areal distribution suggest that the Masseria del Monte Tuff resulted from a magnitude (M) 6.6 eruption (corresponding to volcanic explosivity index [VEI] 6), similar to the 15 ka caldera-forming Neapolitan Yellow Tuff (M 6.8) eruption at Campi Flegrei. However, the lack of coarse, thick, traceable, near- vent deposit suggests peculiar eruption dynamics. Our reconstruction and modeling of the eruption show the fundamental role that distal tephrostratigraphy can play in constraining the scale and tempo of past activity, especially at highly productive volcanoes.
    Description: Published
    Description: 595-599
    Description: 1V. Storia eruttiva
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 6
    Publication Date: 2024-06-12
    Description: The Campanian Volcanic Zone (CVZ) comprises multiple active volcanoes and includes the highly productive Campi Flegrei and Ischia caldera systems. These caldera volcanoes have produced probably the largest eruptions in Europe in the past 200 ka, such as the Monte Epomeo Green Tuff (MEGT; Ischia) at ca. 56 ka and the Campanian Ignimbrite (CI; Campi Flegrei) at ca. 40 ka, which form widespread isochrons across the Mediterranean region. These closely-spaced volcanic centres erupt phonolitic to trachytic glass compositions that are similar, and thus it can be challenging to correlate tephra deposits to specific volcanic sources. Here we present a detailed tephrostratigraphy for pre-CI eruption activity using the units preserved within a sequence at the coastal Acquamorta outcrop, on the western side of the CI caldera rim. Both the MEGT and CI units are present in the section, and they bracket twelve eruption units that were logged and sampled. New major and trace element glass chemistry data have been acquired for these Acquamorta tephra deposits. Three eruption deposits from Ischia and nine from Campi Flegrei are identified, which helps constrain the tempo of volcanic activity of these centres between the large caldera-forming eruptions. The three Ischia tephra deposits between the MEGT and the CI are indistinguishable based on both major and trace element glass chemistry and cannot be correlated to a specific or known eruption in this interval, such as the Schiappone tephra. The compositional variations between the Campi Flegrei eruptions reveal temporal shifts in the composition of the tephra deposits that reflect changes in the magmatic system prior to the CI eruption. These deposits indicate that there were at least nine eruptions at Campi Flegrei within 16 ka of the enormous CI eruption, and suggest that there was no significant period of repose before the caldera generating eruption.
    Description: Published
    Description: 107915
    Description: OSV2: Complessità dei processi vulcanici: approcci multidisciplinari e multiparametrici
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 7
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 48 (1983), S. 5093-5101 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 48 (1983), S. 5083-5093 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 47 (1982), S. 1371-1373 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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