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Measurements of Reaction Coefficients of NO2 and HONO on Aerosol Particles (1998)

Harrison, Roy M. ; Collins, Gareth M.

Springer

Journal of atmospheric chemistry 30 (1998), S. 397-406

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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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Environmental sources and sinks of alkyllead compounds (1989)

Harrison, Roy M ; Allen, A G

New York, NY [u.a.] : Wiley-Blackwell

Applied Organometallic Chemistry 3 (1989), S. 49-58

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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.