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Abstract
A rapid coulometric procedure is described for the determination of non-volatile strong and non-volatile and volatile weak acids in rain samples. A constant current with known amperage is passed into a measured volume of the sample, with and without volatiles, and the changes in the electromotive force monitored with a potentiometer. Molarities of the different acids are calculated by plotting the function of the electromotive force against time in seconds according to Gran’s theory. The method is useful at acid concentrations of 10-6 to 10-4 M.