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  Subjects -> CHEMISTRY (Total: 841 journals)
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CHEMISTRY (593 journals)                  1 2 3 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 8)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26)
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Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 7)
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African Journal of Bacteriology Research     Open Access  
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African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
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Arabian Journal of Chemistry     Open Access   (Followers: 6)
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Atomization and Sprays     Full-text available via subscription   (Followers: 4)
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Autophagy     Hybrid Journal   (Followers: 2)
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Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 3)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 3)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 3)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 66)
Catalysis for Sustainable Energy     Open Access   (Followers: 7)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 8)
Cellulose     Hybrid Journal   (Followers: 7)
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ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 13)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 71)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 23)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 19)
Chemical Reviews     Full-text available via subscription   (Followers: 174)
Chemical Science     Open Access   (Followers: 22)
Chemical Technology     Open Access   (Followers: 16)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemical Week     Full-text available via subscription   (Followers: 8)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 57)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 26)
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Chemistry & Industry     Hybrid Journal   (Followers: 5)
Chemistry - A European Journal     Hybrid Journal   (Followers: 142)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 15)
Chemistry and Materials Research     Open Access   (Followers: 18)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Hybrid Journal   (Followers: 2)
Chemistry Letters     Full-text available via subscription   (Followers: 45)
Chemistry of Materials     Full-text available via subscription   (Followers: 256)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 22)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 3)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 9)
ChemPlusChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal  
CHIMIA International Journal for Chemistry     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 10)
Chromatographia     Hybrid Journal   (Followers: 24)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Cogent Chemistry     Open Access  
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 10)
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 7)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
Combustion Science and Technology     Hybrid Journal   (Followers: 18)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 2)
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Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 2)
Copernican Letters     Open Access   (Followers: 1)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Crystal Structure Theory and Applications     Open Access   (Followers: 3)
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Detection     Open Access   (Followers: 2)
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Elements     Full-text available via subscription   (Followers: 2)
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Environmental Science : Nano     Partially Free   (Followers: 1)
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        1 2 3 | Last

Journal Cover Advances in Fluorine Science
  [8 followers]  Follow
    
   Full-text available via subscription Subscription journal
   ISSN (Print) 1872-0358
   This journal is no longer being updated because:
    The journal ceased publication in 2006
  • Chapter 1 Fluoride Removal from Water Using Adsorption Technique
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 2

      Management of contaminants such as fluoride is a major public issue. Fluoride of geogenic origin in groundwater used as a source of drinking water is a major concern because fluoride content above permissible levels is responsible for human dental and skeletal fluorosis. Consequently, water sources containing elevated levels of fluoride have to be treated. Coagulation/precipitation, electrochemical, electrodialysis, reverse osmosis, adsorption and hybrid processes combining adsorption and dialysis are widely used defluoridation techniques. Currently, however, the development of cost effective and clean processes due to economic constraints and stringent environmental policies is desired. Adsorption technique is arguably one of the most versatile of all the defluoridation techniques due to a number of reasons such as cost, diverse end-uses, socio-cultural acceptance, regulatory compliance, environmental benignity and simplicity. For this technique, activated alumina, bone char and clay adsorption media are the most developed. During the past two decades, extensive research has focused on a number of alternative adsorbents, some exhibiting improved fluoride sorption performances while at the same time do not alter the quality of treated water. Studies have also shifted toward systematic modeling to approximate adsorber design parameters. In view of these, this review opens with a description of paradigm shifts in drinking water sources and highlights the genesis and toxicological effects of fluoride in drinking water as a means of defining the existing problem. Next, potential and established techniques for defluoridation are revisited. This is closely followed with a review of defluoridation adsorbents recognized by the World Health Organization and those novel defluoridation adsorbents reported in literature over the last two decades, with special reference to drinking water. Emphasis is laid on their availability, fluoride sorption capacity and mechanisms. In recognizing surface-tailored zeolite as a novel sorbent, detailed analysis of fluoride adsorption behavior is provided for this sorbent. Finally, defluoridation adsorption unit configurations, and challenges to and prospects for their implementation are briefly discussed.

      PubDate: 2012-12-15T09:29:36Z
       
  • Chapter 2 Water Defluoridation Processes: A Review. Application:
           Nanofiltration (NF) for Future Large-Scale Pilot Plants
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 2

      Defluoridation of waters using clays as substrates has become popular in many countries to solve problems related to high fluoride concentrations in drinking water in rural areas. But this treatment is limited to low fresh water production. In this work, F− elimination using a nanofiltration (NF) operation will solve problems for-large-scale pilot plants in the future. Results obtained in these fields help-users to facilitate the selection between reverse osmosis (RO) and NF membranes of the most cost-effective membrane for desalination of high fluorinated water. Two sorts of characterization have been developed: (i) physico-chemicals, in terms of hydrophobicity/hydrophilicity, morphology and topography aspects and (ii) mass transfer in terms of pure water and saline solution permeabilities, charged solute rejections and molecular weight cut-off (MWCO). A model inspired by the phenomenological approach proposed by Kedem and Katchalsky (KK) will help to quantify both parts of the mass transfer occurring in NF and RO, i.e. the pure convection and the pure diffusion, separately. This new and original approach will be applied to three membranes, 2 NF and 1 LPRO (low-polarization reverse osmosis), respectively. The study will be limited to low concentration polarization by using diluted solutions (10−3–10−1 M) and high tangential flow rate (4ms−1) under low conversion ratio (5%), operational conditions. Different tools such as contact angle measurements, topography and roughness measurements using atomic force microscopy (AFM), hydraulic permeability and salt solution permeability, will be used to characterize the three membranes. This analytical approach will be coupled with the Spiegler, Kedem and Katchalsky (SKK) phenomenological mass transfer model in order to determine the mass transfer parameters σ and P s for synthetic chloride and sulphate solutions. This novel integer approach makes it possible to determine today an NF most efficient membrane for the elimination of excess F− in a Senegalese water sample taken from the endemic region of Fatick. This membrane denoted NF90 works very well due to its diffusional behaviour for fluoride rejection, its high hydraulic permeability and sufficient observed rejection for F− in comparison to RO.

      PubDate: 2012-12-15T09:29:36Z
       
  • Chapter 3 Calixpyrrole–Fluoride Interactions: From Fundamental Research
           to Applications in the Environmental Field
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 2

      Synthetic macrocycles such as calixpyrroles are capable of complexing anions and discriminating between them most effectively. This chapter is concerned with calixpyrrole and derivatives with selective properties towards the fluoride anion as demonstrated through the use of spectrometric, electrochemical and thermal (calorimetry) data. Selectivity is one of the main features in supramolecular chemistry. As such the importance of thermodynamics in assessing quantitatively selectivity is emphasised. An account is given about the steps undertaken for the thermodynamic characterisation of the binding process involving calixpyrroles and the fluoride anion in different media. Thus based on stability constant data, selectivity factors are calculated to illustrate the anion, receptor and medium effects on the selective binding of calixpyroles with the fluoride anion. Representative examples are given to demonstrate the role of solvation on the complexation process. The applications of calixpyrroles in the design of sensors and new materials with potential use as decontaminant agents for the removal of fluorides from water are discussed.

      PubDate: 2012-12-15T09:29:36Z
       
  • Chapter 4 Fluorine-Containing Agrochemicals: An Overview of Recent
           Developments
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 2

      The dramatic effect of fluorine on the biological activity of agrochemicals such as herbicides, insecticides, fungicides, and plant growth regulators has earned fluorine a unique place in the toolbox of the agrochemical chemist. Introduction of fluorine into a biologically active molecule during the structure–activity optimization process can dramatically modify its biological activity by affecting any of a number of parameters, such as binding to a target receptor or enzyme, transporting the bioactive molecule from the point of application to the target site, and blocking metabolic deactivation. This enhanced role of fluorine in the discovery of new agrochemicals is reflected in more than three-fold increase in the number of fluorine-containing agrochemicals in the past three decades. In this review, we discuss recent developments and challenges in the field of fluorine-containing agrochemicals and place them in the context of work done in the past five decades.

      PubDate: 2012-12-15T09:29:36Z
       
  • Chapter 5 Fluorine: Friend or Foe' A Green Chemist's Perspective
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 2

      The contribution of fluorine chemistry to the field of clean chemical technology is reviewed. The roles of fluorochemicals in the environment and the ways in which they may be involved in inherently ‘greener’ processes are discussed.

      PubDate: 2012-12-15T09:29:36Z
       
  • Chapter 6 Emerging “Greener” Synthetic Routes to Hydrofluorocarbons:
           Metal Fluoride-Mediated Oxyfluorination
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 2

      Current technologies used in the manufacture of aliphatic and aromatic hydrofluorocarbons (HCFs) generate large quantities of waste, particularly hydrochloric acid, which is under severe environmental scrutiny and needs to be eliminated. Although highly desirable, direct and selective conversion of a C–H bond to a C–F bond using HF is not feasible due to the thermodynamic considerations. An environmentally “greener” process for the synthesis of fluorocarbons can be envisioned through an intermediate inorganic metal fluoride that is capable of fluorinating a C–H bond of a desirable hydrocarbon and could be regenerated to the appropriate oxidized metal fluoride with oxygen and HF. This process, when successfully implemented, will eliminate H2O as the only by-product. In this chapter, we review on our research efforts to achieve oxyfluorination of a C–H bond to C–F bond using HF recyclable inorganic metal fluorides (e.g. CuF2, AgF) to form many industrially important aliphatic and aromatic hydrofluorocarbons used in the manufacture of refrigerants, etching agents, industrial polymers, pharmaceuticals and agrochemicals.

      PubDate: 2012-12-15T09:29:36Z
       
  • Chapter 7 Fluorine Analysis by Ion Beam Techniques for Dating Applications
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 2

      Megaelectron volt (MeV) ion beam techniques offer a number of non-destructive analysis methods that allow to measure depth profiles of elemental concentrations in material surfaces. Elements are identified by elastic scattering, by specific nuclear reaction products or by emission of characteristic X-rays. With nuclear microprobes raster images of the material composition at the surface can be obtained. Particle-induced gamma-ray emission (PIGE) is especially suited for fluorine detection down to the ppm concentration level. The technical aspects of fluorine detection by nuclear reactions as well as its applications to fluorine analysis in geological and archaeological objects are reviewed. Special attention is given to the determination of exposure ages of meteorites on the Antarctic ice shield and burial durations of archaeological bones and teeth. This information can be acquired by evaluation of the shape and penetration depth of the diffusion profile of fluorine that was incorporated by the sample from the environment. For a quantitative assessment of the data, several factors like ambient conditions and diagenetic state of the material have to be taken into account.

      PubDate: 2012-12-15T09:29:36Z
       
  • Chapter 8 Fluorine and Its Relevance for Archaeological Studies
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 2

      This paper represents a review of the importance of studying fluorine (F) in archaeological artefacts. Fluorine is an element which is omnipresent in water and soil environments. Thus, it is incorporated into archaeological artefacts as bones or flints in different ways during their burial depending on the geochemical conditions and on the artefact conservation state. The incorporation pathways of F lead to different F distribution patterns in the artefacts. Therefore, these artefacts can be considered as geochemical archives for the reconstruction of their burial history. Moreover, studies of F in ancient bone material or flints can give precious information that are relevant for archaeological purposes as e.g. post-mortem diagenesis. In some cases, relative dating or evidence for heat processes of artefacts is possible. In the introduction, the paper gives a review of general questions in archaeology and relevant examples where analytical studies can give answers to. Then, ancient materials where F is found are presented. The study of F in archaeology is particularly important for materials as bones and flints. Therefore, the majority of the paper is dedicated to the study of these materials and the information deduced on the past. The knowledge of the composition and structure of both types of material is necessary for the understanding of the F incorporation, and is briefly reviewed. Furthermore, postulated incorporation mechanisms of the F uptake over time are reported. In the next paragraph, the most commonly applied analytical methods for F detection in archaeological artefacts are presented. Specific problems related with the analysis of precious and unique artefacts are discussed. Significant archaeological case studies are shown and discussed to highlight the importance of F studies in archaeological artefacts. However, these examples enable us to evidence the limits of F relevance in archaeology and the precautions to take when using these data for archaeological interpretations. Finally, conclusions and an outlook are presented.

      PubDate: 2012-12-15T09:29:36Z
       
  • List of Contributors
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 1



      PubDate: 2012-12-15T09:29:36Z
       
  • Foreword
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 1



      PubDate: 2012-12-15T09:29:36Z
       
  • Introduction to “Fluorine and the Environment”
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 1



      PubDate: 2012-12-15T09:29:36Z
       
  • Chapter 1: Fluorine in the Atmosphere
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 1

      Scientific evidence, accumulated over more than two decades of study by the international research community, has shown that human-produced halocarbons are responsible for the observed depletions of the ozone layer. Fluorine-containing chlorofluorocarbons (CFCs) and halons are sufficiently long-lived so as to reach the stratosphere where they are photodissociated to release chlorine, bromine, and fluorine atoms. Although chlorine and bromine have been proven to be main responsible for the destruction of the ozone layer in the polar regions, fluorine by itself does not contribute to ozone depletion. Fluorine atoms released from the photodissociation of fluorine-bearing sources are quickly sequestered into carbonyl compounds and subsequently into the ultimate hydrogen fluoride, which is very stable in the stratosphere. The primary interest in monitoring inorganic fluorine (defined as F y ) in the atmosphere is as a surrogate of the amounts of its precursors, mainly the CFCs and hydrochlorofluorocarbons, involved in ozone depletion by chlorine. Fluorinated halocarbons and other gases such as perfluorocarbons or sulfur hexafluoride (SF6) are also extremely potent greenhouse gases for which the current trends must be monitored and future scenarios of growth must be evaluated.

      PubDate: 2012-12-15T09:29:36Z
       
  • Chapter 2: Evaluation and Selection of CFC Alternatives
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 1

      This chapter reports on the effect of fluorine compounds in the atmosphere. These compounds have been evaluated for their role in ozone layer depletion and global warming. The state of their application, the use of alternatives and the alternatives themselves were analyzed. There are also explanations of the science behind ozone depletion potential and global-warming potential, of associated evaluation methods, and new methods that can compensate for previous deficiencies. The results suggest that fluorine compounds with short atmospheric lifetimes are suitable as chlorofluorocarbon alternatives.

      PubDate: 2012-12-15T09:29:36Z
       
  • Chapter 3: Trifluoromethyl Sulphur Pentafluoride, SF5CF3: Atmospheric
           Chemistry and Its Environmental Importance via the Greenhouse Effect
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 1

      One molecule of SF5CF3, an adduct of the SF5 and CF3 free radicals, causes more global warming than one molecule of any other greenhouse gas yet detected in the atmosphere, that is, it has the highest per molecule radiative forcing of any greenhouse pollutant, and the value of its global warming potential is only exceeded by that of SF6. Using tunable vacuum-UV radiation from a synchrotron and coincidence spectroscopy, the strength of the central S−C bond in SF5CF3 is determined to be 3.86 ± 0.45eV or 372 ± 43 kJ mol−1, and this molecule is highly unlikely to be removed from the Earth's atmosphere by UV photolysis in the stratosphere. Complementary laboratory-based experiments have shown that the main sink route of this greenhouse gas is low-energy electron attachment in the mesosphere, with Lyman-α photodissociation at 121.6nm being only a minor channel. On comparison with data for SF6, the lifetime of SF5CF3 in the Earth's atmosphere is estimated to be ca. 1000 years. The principal reason for the current low level of concern about the impact of SF5CF3 on our environment is that the concentration levels are still very low, at the sub parts per trillion level. The high growth rate of ca. 6% per annum, however, should cause concern for policymakers.

      PubDate: 2012-12-15T09:29:36Z
       
  • Chapter 4: Production of Second- or Third-Generation Fluorine-based
           Refrigerants from (Photo)-Dechlorination of Fluorocarbon Wastes
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 1

      Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) are called first-generation fluorocarbons because they contain chlorine atoms. Because they deplete the ozone layer, the production of CFCs has been banned and HCFCs will soon share the same fate. From this trend one can predict that hundreds of thousands of tons of CFCs or HCFCs presently being used will become harmful wastes in the near future. On the other hand, if these chlorinated wastes could be converted into either nonhazardous or useful compounds, CFCs or HCFCs could be regarded as chemical feedstocks. In this work, our first objective was to develop a decomposition method for CFCs or HCFCs at moderate conditions. Combustion of CFCs is an obvious choice, but has the disadvantage of producing toxic compounds such as dioxins. In our work, we found that photodecomposition of chlorinated compounds in dissolved alcohol–NaOH solutions under ultraviolet (UV) irradiation is possible under mild conditions of room temperature and atmospheric pressure. Chlorine atoms are easily removed yielding NaCl. Among the 12 chlorinated compounds tested, low-pressure mercury lamps were more effective than high-pressure ones. Chlorodifluoromethane (HCFC-22) and dichlorotrifluoroethane (HCFC-123a) is decomposed by only bubbling into methanol–NaOH solution and did not require UV irradiation. The second objective of our work was to determine the reaction products and their possible application to environmental fields. Three kinds of solutions, methanol plus NaOH, 2-propanol plus NaOH, and 2-propanol, were tested using 10 types of CFCs and HCFCs. Results showed that the main products were either hydrofluorocarbons (HFCs) or fluoroethers. HFCs are known as second-generation fluorocarbons because – although they have low effects on the ozone layer – they still have a large greenhouse gas potential. Fluoroethers are known as third-generation refrigerants, because they have neither the ozone layer depleting potential nor the greenhouse gas potential. Our work showed the possibility that wastes such as CFCs and HCFCs could be converted into resources. From our results, a possible system for producing 1,1-difluoromethyl ether, CH3OCHF2, is via HCFC-22, because the reaction occurs in the absence of UV irradiation at room temperature and atmospheric pressure, and is widely used in air conditioners. As vapor pressure of the ether is similar to that of chlorodifluoroethane (HCFC-142b), the ether has a good possibility of use as an alternative refrigerant for HCFC-142b. The third objective of our work was to know the effect of process factors such as agitation in addition to reaction mechanism for designing a photochemical reactor. The process is composed of two steps: a mass transfer process of fluorocarbons dissolving in solutions from vapor bubbles and the reaction rate in a solution. To estimate the mass transfer, we measured the solubility of fluorocarbons in alcohol–NaOH solutions. Using these values, a stationary state model, in which mass transfer rates and reaction rates are balanced, was set up. Using the stationary state model with the kinetic data, we obtained a model for the reaction rate and were able to propose a reaction mechanism.

      PubDate: 2012-12-15T09:29:36Z
       
  • Chapter 5: Volcanic Fluorine Emissions: Observations by Fourier Transform
           Infrared Spectroscopy
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 1

      Volcanoes are an important natural source of fluorine to the environment. For several decades, fluorine emissions from volcanoes have been measured by laboratory analysis of samples collected in situ, and abundances compared with other gas species to infer magmatic and hydrothermal processes occurring at depth. More recently, open-path Fourier transform infrared (OP-FTIR) spectroscopy has been applied to field measurements of volcanic gas plumes, offering several advantages including the ability to detect and quantify simultaneously, and with high time resolution, many volcanic gas species. These include hydrogen fluoride (HF) and silicon tetrafluoride (SiF4), and potentially other F-bearing gases. Such measurements yield valuable insights into the degassing of fluorine from magmas and contribute to our understanding of the environmental impacts of volcanic emissions.

      PubDate: 2012-12-15T09:29:36Z
       
  • Chapter 6: Fluorine and Coexisting Volatiles in the Geosphere: The Role in
           Japanese Volcanic Rocks
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 1

      Comprehensive knowledge of the volatile behavior in volcanic rocks is of great value to clarify the process of magma generation and differentiation. However, few studies on volatile elements, particularly the fluorine content in volcanic rocks, have been made because of the difficulties of the analytical technique. In the present research, two types of analytical techniques have been investigated. One is a progressed separation method of distillation with potentiometric determination and the other is a chromatographic method combined with cation-exchange pretreatment. Using the above techniques, fluorine was determined on the 113 volcanic rocks obtained from various parts of Japanese islands. In addition, the other volatile and major elements were also determined on 44 different samples. The analytical results were geochemically interpreted using multivariate analysis in the light of magma generation theory in the subduction zones. The geographical distribution of volatile elements showed that the chemical contents were more related to the source of the elements rather than the chemical property or ionic radius. The factor structure of volatile elements led to the following findings: (1) seawater components brought by subducting slab have a significant influence on the behavior of chlorine, bromine, boron, and arsenic; (2) fluorine and sulfur are mainly contributed by the mantle components.

      PubDate: 2012-12-15T09:29:36Z
       
  • Chapter 7: Fluorine Compounds in Gaseous Emissions from Industrial
           Sources: The Case of Ceramic Industries
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 1

      This chapter assesses fluorine emissions as an atmospheric pollutant that originated from the clay-based raw material used in ceramic industries. After a short review on the production technology of ceramic products, the main features of fluorine emission in firing processes are outlined. It is demonstrated that the emission rate of fluorine increases with the increasing fluorine content in the raw material and the firing temperature. A roundup of methods has been reported for emission sampling and analysis of fluorine content both in gaseous emission and in clay raw materials. The fluorine content of clays on an average is much the same as the one typically found in the Earth's crust, as shown by different studies reported in this work; hence, clays cannot be considered as a major source of fluoride. However, due to the large amount of clays used, the total emission needs to be under control: a detailed review of principal abatement techniques usually used in the ceramic sector is described, in order to underline the different abatement efficiency. A very brief summary of diseases caused in animals and plants by an excess of fluoride in water and atmosphere is also presented.

      PubDate: 2012-12-15T09:29:36Z
       
  • Chapter 8: Some Problems Relating to Fluorides in the Environment: Effects
           on Plants and Animals
    • Abstract: 2006
      Publication year: 2006
      Source:Advances in Fluorine Science, Volume 1

      Several aspects of fluorides in the environment have been researched for decades so there is a great deal of published information. However, the authors consider that there are several important areas where information is lacking, data are contradictory, mechanisms of action have not been explored, or the environmental effects of particular compounds are not known. Therefore, this chapter reviews a selection of such topics: inorganic fluorides in soil; the loss of fluorides from plants; classifying species sensitivity to HF; estimating effects of fluorides on growth and yield; the significance of pollutant interactions; effects of HF on fertilization and seed set; fluorides and insects; and old and new problems associated with organofluorides in the environment.

      PubDate: 2012-12-15T09:29:36Z
       
 
 
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