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Atmospheric iodine chemistry

In summary, the IO + DMS reaction appears to be potentially important in iodine-ozone chemistry and in controlling the DMS behavior in the marine atmosphere. However, the role of this reaction remains to be confirmed by direct field measurements of key species such as IO and CH3I and also by further laboratory measurements on key reactions of the atmospheric iodine chemistry. [Pg.471]

The major impact of atmospheric iodine chemistry is the resultant depletion of O3, while other consequences, such as enhanced cloud formation, remain to be established. [Pg.44]

One common conclusion of the modeling studies on iodine chemistry in the atmosphere (Zafiriou, 1974 Chameides and Davis, 1980 Jenkin et al., 1985 Chatfield and Crutzen, 1990 ... [Pg.1956]

The main conclusions from the early model studies on iodine chemistry remain valid there is a significant lack of information on the kinetics of reactive iodine (especially lO and OIO reactions paths to stable particulate iodine) and on fluxes of alkyl iodides from the oceans. Nevertheless, important progress has recently been made and work is currently ongoing in several laboratories worldwide. This is an important area of atmospheric research in need of more attention. [Pg.1959]

As part of the biogeochemical cycle, the injection of iodine-containing gases into the atmosphere, and their subsequent chemical transformation therein, play a crucial role in environmental and health aspects associated with iodine - most importandy, in determining the quantity of the element available to the mammalian diet. This chapter focuses on these processes and the variety of gas- and aerosol-phase species that constitute the terrestrial iodine cycle, through discussion of the origin and measurement of atmospheric iodine in its various forms ( Sources and Measurements of Atmospheric Iodine ), the principal photo-chemical pathways in the gas phase ( Photolysis and Gas-Phase Iodine Chemistry ), and the role of aerosol uptake and chemistry and new particle production ( Aerosol Chemistry and Particle Formation ). Potential health and environmental issues related to atmospheric iodine are also reviewed ( Health and Environment Impacts ), along with discussion of the consequences of the release of radioactive iodine (1-131) into the air from nuclear reactor accidents and weapons tests that have occurred over the past half-century or so ( Radioactive Iodine Atmospheric Sources and Consequences ). [Pg.38]

For the containment the natural discretisation is into interconnected subcompartments (unless a fully three-dimensional treatment is envisaged), as a discussion between experts on CONTAIN and JERICHO emphasised. Each volume may then have sub-databases describing the walls, internal structures, sump, and atmosphere. This last will have its own database including thermal-hydraulic variables plus an aerosols database and so on. The details will become clearer as code integration proceeds, but the overall philosophy is clear. The description for all systems (core, circuit, containment) is to be in terms of volumes, with a well-defined and natural tree structure being imposed on the data describing each volume. Database definitions are now available for the core/bundle, circuit and containment (including iodine chemistry), and are underdevelopment for core-concrete interaction. [Pg.373]

Orlando JJ (2003) Atmospheric chemistry of organic bromine and iodine compounds. Handbook Environ Chem 3R 253-299. [Pg.45]

Huie, R. E and B. Laszlo, The Atmospheric Chemistry of Iodine Compounds, in Halon Replacements—Technology and Science, ACS Symposium Series 611 (A. W. Miziolek and W. Tsang, Eds.), Chap. 4, Am. Chem. Soc., Washington, DC, 1995. [Pg.715]

Vogt, R. (1999). Iodine compounds in the atmosphere, in P. Fabian and O.N. Singh (eds.), Reactive Halogen Compounds in the Atmosphere, The Handbook of Environmental Chemistry Vol. 4E, Springer, Berlin, pp. 113-128. [Pg.225]

The halogen family, fluorine, chlorine, bromine, and iodine has only recently been introduced into atmospheric chemistry.9 The catalytic cycle, with an atom such as Cl in the presence of its monoxide CIO, can... [Pg.73]

Jenkin, M.E., Cox, R.A. Candleland, D.E. (1985) Photochemical aspects of tropospheric iodine behaviour. Journal of Atmospheric Chemistry, 2, 359-75. [Pg.150]

Role of the reaction of IQ with DMS. The IO + DMS reaction may have an impact on both the iodine-ozone chemistry and on the fate of DMS in the atmosphere. [Pg.469]

The discovery of relationships between atmospherical and soil chemistry opened new possibilities for explanations of geomedical causes. Earlier, cases of goitre were often ascribed to the fact that people used too little salt-water fish in their diet. Recent investigations have shown, however, that in inland districts with low precipitation, the soil as well as the vegetation has a low iodine content (LIg, 1972). Whether the differences in the bromine content, which also was found, has any influence, is unknown. [Pg.543]

If the already mentioned measurements of Cauer (1939) of gas phase iodine concentrations that resulted from the industrial burning of kelp of 0.5 p,g m were indeed correct and representative, it may be interesting to find out what impact anthropogenic iodine pollution may have had on the chemistry of the atmosphere during the first quarter of the past century in Europe. [Pg.1956]

Vogt R. (1999) Iodine compounds in the atmosphere. In The handbook of Environmental Chemistry Volume 4, Part E. Air Pollution (eds. P. Fabian and O. N. Singh). Springer, Heidelberg, Germany, pp. 113—129. [Pg.1977]

McFiggans, G. Modelling the formation of aerosol due to iodine photochemistry - from the laboratory to the atmosphere . Proceedings of the CERC 3 Young Chemists Workshop - Atmospheric Chemistry and Particulate Matter, Magleas, University of Copenhagen, Denmark, 3rd-6th June 2002... [Pg.66]

Except for much greater Cl accumulation in soils of arid regions, the soil chemistry of I and Br resembles that of Cl, except that I and Br are retained more strongly, especially by acid soils. The major input of I to soils appears to be atmospheric. Endemic iodine deficiency (goiter in humans) occurs in mountainous and continental areas isolated from the sea. Fortunately, supplementing NaCl with small amounts of I effectively supplies the I required in animal diets. Iodide and Br are both potentially toxic, but no natural cases have been reported. Bromide reactions in soils have been investigated as a tracer for die movement of water, nitrate, and soil solutions in soils. [Pg.43]

Figure 8.4 Schematic showing the chemical cycling of the gas-phase halogens (iodine highlighted in dark gray) in the atmosphere, and the links to aerosol formation and chemistry (adapted from Saiz-Lopez and Plane, 2004a). Figure 8.4 Schematic showing the chemical cycling of the gas-phase halogens (iodine highlighted in dark gray) in the atmosphere, and the links to aerosol formation and chemistry (adapted from Saiz-Lopez and Plane, 2004a).
Yoshida, S. Muramatsu, Y. (1995). Determination Of Organic, Inorganic And Particulate Iodine In The Coastal Atmosphere Of Japan. Journal Of Radioanalytical And Nuclear Chemistry, Vol.196, No. 2, pp 295-302, ISSN 1588-2780 Zabala, J., Carrion, N., Murillo, M., Quintana, M., Chirinos, J., Seijas, N, Duarte, L. Bratter, P. (2009). Determination Of Normal Human Intrathyroidal Iodine In Caracas Population. Trace Elem Med Biol, Vol.23, No.l, pp 9-14, ISNN 0946-672X Zaichick, V. Zaichick, S. (1997). Normal Human Intrathyroidal Iodine. Sci Total Environ. Vol.27, No.206(l), pp 39-56, ISSN 0048-9697... [Pg.397]

Iodine pentoxide, I2O5, is the most stable oxide of the halogens [8]. It has found some practical application as a mild oxidant, especially useful in analytical chemistry. Iodine pentoxide is one of the few chemicals that can oxidize carbon monoxide rapidly and completely at room temperature. The reaction forms the basis of a useful analytical method for determining the concentration of CO in the atmosphere or in other gaseous mixtures [8]. [Pg.426]


See other pages where Atmospheric iodine chemistry is mentioned: [Pg.469]    [Pg.473]    [Pg.299]    [Pg.469]    [Pg.473]    [Pg.299]    [Pg.170]    [Pg.41]    [Pg.43]    [Pg.53]    [Pg.531]    [Pg.625]    [Pg.656]    [Pg.380]    [Pg.471]    [Pg.14]    [Pg.3]    [Pg.56]    [Pg.542]    [Pg.93]    [Pg.53]    [Pg.3051]    [Pg.11]    [Pg.1936]    [Pg.1937]    [Pg.2904]    [Pg.2921]    [Pg.187]    [Pg.135]    [Pg.146]    [Pg.89]    [Pg.41]    [Pg.255]   
See also in sourсe #XX -- [ Pg.8 , Pg.76 ]




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