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  • 1
    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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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of Octanol-Water Partition Coefficients, Water Solubility and Vapour Pressures of Alkyl-lead Compounds (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 10 (1996), S. 773-778 
    Details
    ISSN: 0268-2605
    Keywords: alkyl-lead ; octanol- ; water partition coefficient ; Kow ; water solubility ; vapour pressure ; Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Physico-chemical properties of alkyl-lead compounds, namely aqueous solubility, octanol-water partition coefficient (Kow), vapour pressure and Henry's Law constant, have been determined. Vapour pressures of trialkyl-lead salts at different temperatures were measured by a gas-saturation technique in which air was passed slowly through a glass column packed with pure solid alkyl-lead compounds. Kow of tetra-alkyl-lead (TAL) and trialkyl-lead (TriAL) were determined under different salinity and pH conditions, and the latter were related to the species (R3Pb+, R3PbOH0 or R3PbCl0) dominating under a particular set of conditions. Regression calculations incorporating melting point corrections relate water solubility to Kow, and provide a means of estimating either parameter for a wider range of compounds.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    Concentrations, phase partitioning and deposition of specific alkyl-lead compounds in the atmosphere (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 11 (1997), S. 889-901 
    Details
    ISSN: 0268-2605
    Keywords: alkyl-lead ; atmosphere ; phase partitioning ; wet deposition ; Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Measurements of alkyl-lead compounds in air and rain at rural and urban sites in central England during 1996 are reported. Vapour, aerosol and rain concentrations of individual tetra-, tri- and di-alkyl-lead species have been determined simultaneously at both sites, along with inorganic lead aerosol. The results show the predominance of vapour-phase over particle-associated species, with tetramethyl-lead being the most prevalent vapour-phase compound, with concentrations of up to 5.8 ng Pb m-3. Theoretical phase-partitioning coefficients for individual alkyl-lead compounds have been calculated and compared with measured values. Washout ratios for alkyl-lead compunds were found to be smaller than for inorganic lead. Atmospheric concentrations of both organic and inorganic lead appear to be falling, broadly in line with recent reductions in the use of alkyl-lead in gasoline. © 1997 John Wiley & Sons, Ltd.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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