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Horizontal gradients in atmospheric aerosol strong acidity have been interpreted in terms of the rate of neutralisation of aerosol H' by gaseous ammonia. The results indicate a pseudo-first-order rate constant for this reaction within the range 4 x lFh ss' to 4.1 x lo-" ss' consistent with model results and experimental data derived by other methods. The rate constant is reduced as the aerosol becomes less acidic, which is reflected in a positive correlation between rate constant and aerosol H'/ NH: ratio.

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