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  • 1975-1979  (11)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Photoreactivity of aqueous anionic nox − with hydrocarbons (1978)
    Springer
    Water, air & soil pollution 10 (1978), S. 45-59 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The reduction of aqueous nitrates by suspended N-heptane is investigated under irradiation with a strong unfiltered UV source. Chemical changes are monitored using time-curves of nitrite and ammonium formation in the aqueous phase. Those kinetics suggest overall reactions which involve free radicals and take place over a wide range of NO concentrations, temperatures, pH and light intensity. The research is aimed at a better understanding of some photoprocesses which occur on heterogeneous aerosol substance, in areas polluted by either natural or man-made particulates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00161995
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Photochlorination of organics by aqueous Cl− codissolved with anionic NO x Emphasis〉/− (1978)
    Springer
    Water, air & soil pollution 10 (1978), S. 403-412 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Earlier research, on the photoreactivity of some organics with aqueous NO x − extended to systems comprising codissolved chlorides. It is found that concentrations of NO3 − bear a determining role on the transfer of Cl from the aqueous into the organic phase and that rates of this transfer also depend on Cl− concentration as well as on the intensity of UV light. A simple overall mechanism is postulated for the process studied in the laboratory and the experimentation is thereafter extended to conditions of sunlight illumination where the reaction is found to occur along similar lines but with larger quantum yields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00250006
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Photochlorination of organics by aqueous Cl− codissolved with anionic NO x − (1978)
    Springer
    Water, air & soil pollution 10 (1978), S. 413-420 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract With analogy to the nitric anion, aqueous NO2 − codissolved with chloride is found to promote photochlorination of some reactive organic compounds in contact with those solutions. Both overall patterns of the process and the quantum yields of this chlorine transfer into the organic phase, are found to be very similar to the patterns and yields of reactions which involved nitrates and were carried out under artificial illumination. With further analogy to those photoreactions of nitrate-chloride systems, the overall kinetics outlined in the laboratory for systems comprising nitrites are also followed, with higher quantum yields, under sunlight illumination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00250007
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Photoreactivity of aqueous anionic NO x − With hydrocarbons (1978)
    Springer
    Water, air & soil pollution 10 (1978), S. 221-230 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The photoreductivity of aqueous sodium nitrates by suspended N-heptane, benzene and terpin hydrate is investigated in the laboratory using a versatile apparatus and artificial UV light of intensities similar to those found in nature. Rates of nitrite and ammonium formation are evaluated with the purpose of extending those estimates to conditions of sunlight illumination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00464717
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Photoreactivity of aqueous anionic NO x − with hydrocarbons (1978)
    Springer
    Water, air & soil pollution 10 (1978), S. 231-238 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Suspensions of N-heptane, benzene and terpin hydrate in aqueous solutions of sodium nitrate are photolyzed under sunlight at an unpolluted mountain site. Rates of nitrite and ammonium formation in the aqueous phase are found to follow patterns very similar to those previously obtained in the laboratory using artificial UV of comparable intensities and the same experimental assembly. Yields of both nitrite and ammonium formed with time are also found to be within ranges of magnitude expected on the basis of that laboratory experimentation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00464718
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Photoreactivity of aqueous anionic NOx with hydrocarbons part I nitrite-heptane system under strong UV. radiation (1977)
    Springer
    Water, air & soil pollution 7 (1977), S. 69-78 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The reduction of nitrous ions, in solutions containing heptane suspended under vigorous stirring and irradiated with a strong UV source, is investigated. The formation of ammonium is used as a monitor of the process which also leads to the concurrent production of organic nitrates and nitrites, as well as of aldehydes and nitro, nitroso and ammino derivatives. An overall mechanism of ammonium formation and destruction is proposed and tested and the effects of NO inf2 sup− concentration, pH, radiation intensity and temperature are evaluated. Implications towards the importance of similar reactions which may occur under sunlight are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00283800
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Reactivity of aqueous nitrates with suspended organic substance, under ultraviolet radiation (1978)
    Springer
    Water, air & soil pollution 9 (1978), S. 349-353 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Recent research on the photoreduction of aqueous nitrite by suspensions of some organic compounds is extended to solutions of inorganic nitrates. With analogy to our previous work, formation of ammonium in the aqueous phase is found to occur. However, the related kinetics strongly depend on several concurrent reactions of nitrite, such as its decomposition, its further reduction and its attack onto the organic substance. With further analogy to the work carried out in a nitrous medium, there also is formation of diverse organic derivatives, their yields being larger by a factor of 2 to 4 at those experimental conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280683
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Photoreactivity of some organics with aqueous Br− and I− codissolved with nitrate (1979)
    Springer
    Water, air & soil pollution 12 (1979), S. 283-294 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Our earlier research on the photochlorination of some organics suspended in solutions of aqueous Cl− codissolved with anionic NO x − is extended to systems comprising either bromides or iodides, and NO 3 − . It is found that the bromide-containing systems follow, under both artificial UV and sunlight, overall reaction patterns quite similar to those of chlorides although the rate term which stands for the bromination of organics is larger and directly proportional to light intensities. Solutions containing iodides also follow a similar overall pattern but the first rate term is now proportional to the square of light intensity. However, they react liberating detectable amounts of iodine which thereafter attack the hydrocarbon. This excess of elementary iodine is thus found to be either dissolved in or adsorbed by the organic; it furthermore also dissolves and becomes complexed in the aqueous phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01047016
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    UV photoreduction of aqueous nitrite in heptane suspensions (1976)
    Springer
    Water, air & soil pollution 5 (1976), S. 403-406 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Ultraviolet photolysis of aqueous nitrite solutions in contact with a paraffin hydrocarbon causes a reduction of nitrite, by abstracted hydrogen atoms, to occur. This is evidenced by the formation of ammonium whose concentration is found to follow a simple, overall, kinetic pattern.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280841
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Photoreactivity of aqueous anionic NOx - with hydrocarbons (1977)
    Springer
    Water, air & soil pollution 8 (1977), S. 217-224 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Research on ammonium formation, by photoreduction under UV radiation of aqueous nitrite with suspended heptane, is extended to benzene and terpin hydrate. Radiation intensities similar to those found in nature are used this time with the purpose of determining, under laboratory conditions, overall rates of those processes. The photolysis is carried out in a versatile apparatus and the results obtained are regarded as introductory towards investigations to be carried out under conditions of sunlight illumination. While the formation of ammonium in the nitrite — heptane system is found to follow the pattern previously outlined, thus confirming our earlier work, the reaction with both compounds which contain either double bonds or OH groups follows a simpler route which involves much larger yields of ammonium, and an attack of photoformed transients onto those reactive sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294044
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    Paper (German National Licenses)
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