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Detailed Reference Information |
Elliott, S. and Rowland, F.S. (1993). Nucleophilic substitution rates and solubilities for methyl halides in seawater. Geophysical Research Letters 20: doi: 10.1029/93GL01081. issn: 0094-8276. |
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Ozone depletion potentials indicate that methyl bromide is among halogen containing gases which may be scheduled for international level regulation. The oceanic component of its global budget is currently unquantifiable because of a lack of surface seawater measurements. Given values for internal removal and for solubility, marine mixed layer modelling can set bounds for air-sea transfer. Rate constants have been measured in seawater, 0.5m NaCl and distilled water for attack on methyl bromide by the chief oceanic nucleophiles chloride ion and H2O over much of the oceanographic temperature range (0¿ to 22 ¿C). Henry's Law constants have been determined for the same conditions. All results are consistent with classical aqueous phase research adjusted for ionic strength effects. The lifetime of methyl bromide with respect to chemical decay in seawater is three weeks at average surface temperatures, and a factor of ten larger and smaller at the extremes. Its dimensionless solubility ranges from 0.1 to 0.3. Analogous experiments are reported for the other natural methyl halides, CH3Cl and CH3I. ¿ American Geophysical Union 1993 |
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Abstract |
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Keywords
Atmospheric Composition and Structure, Middle atmosphere—composition and chemistry, Atmospheric Composition and Structure, Troposphere—composition and chemistry, Atmospheric Composition and Structure, Geochemical cycles, Oceanography, General, Physical and chemical properties of sea water |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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