Abstract
Details of field measurements of concentrations of SO2 and H2O2 in cloudwater at Great Dun Fell in Cumbria are given.
Strong differences were found in H2O2 concentrations in cloudwater collected during autumn and spring periods. Autumn values were typically well below 1 µmol 1-1whereas springtime values were rarely below 1 µmol 1-1with concentrations in excess of 100 µmol 1-1 recorded.
Comparative measurements of aqueous concentrations of hydrogen peroxide using a chemiluminescence analyser and a fluoresence based analyser showed good agreement over a range of concentrations. Residual signals, attributable to the presence of organic peroxides, determined following catalase treatments, were found to constitute only a small fraction of the total peroxide concentration.
The second order rate constants for the reaction H2O2 + HSO3 − in cloudwater, derived from the decay of H2O2 ranged from 4.2 × 102 to 1.84 × 104 1 mol-1 s-1 for a pH range of 4.0 − 4.5.
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© 1988 Kluwer Academic Publishers
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Dollard, G.J., Jones, B.M.R., Chandler, A.S., Gay, M.J. (1988). Measurements of Ambient SO2 and H2O2 at Great Dun Fell and Evidence of their Reaction in Cloud. In: Unsworth, M.H., Fowler, D. (eds) Acid Deposition at High Elevation Sites. NATO ASI Series, vol 252. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3079-7_11
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DOI: https://doi.org/10.1007/978-94-009-3079-7_11
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