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  • Organic Chemistry  (3)
  • accommodation coefficient  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Measurements of Reaction Coefficients of NO2 and HONO on Aerosol Particles (1998)
    Springer
    Journal of atmospheric chemistry 30 (1998), S. 397-406 
    Details
    ISSN: 1573-0662
    Keywords: reaction coefficient ; accommodation coefficient ; nitrogen dioxide ; nitrous acid ; heterogeneous reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The reaction coefficients of nitrogen dioxide and nitrous acid with monodisperse sodium chloride and ammonium sulphate aerosols have been measured in a flow reactor at atmospheric pressure. These experiments were performed at relative humidities above and below the deliquescence points of both aerosols (r.h. 50 and 85%) at 279 K. The results for NO2 afford a reaction coefficient in the range (2.8–10) × 10-4 and for HONO, (2.8–4.6) × 10-3. For both species, there appears to be an enhancement of the reaction coefficient on sodium chloride aerosol at 50% r.h. The results are compared with reaction coefficients determined by other experimental methods. A good agreement is found for both gases between this method and the coated denuder method previously developed in our research laboratories (Msibi et al., 1993) and with the majority of other published data for NO2. In the case of HONO, our estimate of reaction coefficient is smaller than, or at the lower limits of the ranges reported by other published studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006094304069
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Environmental sources and sinks of alkyllead compounds (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 3 (1989), S. 49-58 
    Details
    ISSN: 0268-2605
    Keywords: Alkyllead ; bioalkylation ; washout ratios ; phytoplankton ; marine algae ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Evidence is presented in favour of a natural environmental alkylation process as a source of atmospheric vapour-phase alkyllead. Several species of marine flora have been cultured under laboratory conditions with added doses of inorganic lead, and production of alkyllead, predominantly trimethyllead (Me3Pb+), has been measured. Atmospheric concentrations and ratios of alkyl and inorganic lead at urban, rural and remote sites suggest that differential decay and deposition processes for different species, together with an environmental alkylation source, may explain enhanced ratios of total alkyllead/total lead in maritime air masses.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590030105
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  • 3
    Electronic Resource
    Electronic Resource
    Assessment of recent trends in concentrations of alkyl-lead compounds in rainwater (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 7 (1993), S. 567-575 
    Details
    ISSN: 0268-2605
    Keywords: alkyl-lead ; rainwater ; gas chromatography/atomic absorption spectroscopy ; temporal trends ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Concentrations of tetra-, tri and di-alkyl-lead compounds in rain have been measured at rural and urban sites in England. The measurements are compared with similar data collected in the early 1980s, prior to a 72% reduction in the emission of lead from combustion of leaded petrol. Whilst concentrations of inorganic lead have fallen broadly in line with emissions of automotive lead, alkyl-lead concentrations in rain have fallen by only 50% or less, and thus the ratio of alkyl-lead to inorganic lead in rain has increased appreciably. The reason for this phenomenon is unclear. The data suggest that lead in rainwater would fall to approximately 2 μg dm-3 if automotive lead emissions fell to zero.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590070717
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  • 4
    Electronic Resource
    Electronic Resource
    Speciation of butyltin compounds in oyster samples (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 2 (1988), S. 151-157 
    Details
    ISSN: 0268-2605
    Keywords: Speciation ; gas chromatography ; quartz furnace atomic absorption spectrometry ; butyltin compounds ; oyster samples ; mixed methylbutyltin compounds ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Experimental instrumentation for the speciation of butyltin compounds by hydride generation and gas chromatography-quartz furnace atomic absorption spectrometry is described. Evaluation of a number of extraction methods revealed that simple acid leaching of oyster samples gave adequate recoveries. The levels of each butyltin species in oyster flesh and gill are reported together with the tentative identification of a mixed methylbutyltin compound.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590020209
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