The ionization of acids in estuarine waters

Physics

Scientific paper

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Scientific paper

The stoichiometric, K HA * , and apparent, K ' HA , constants for the ionization of a number of weak acids (NH 4 + , HSO 4 - , HF, H 2 O, B(OH) 3 , H 2 CO 3 , HCO 3 - , H 3 PO 4 , H 2 PO 4 - , HPO 4 2 , H 3 AsO 4 H 2 AsO 4 - and HAsO 4 2- ) in seawater at 25°C diluted with water have been fitted to equations of the form ( , 1979). In K HA * = In K HA + AS 1/2 + BS where In K HA is the thermodynamic constant in water, S is the salinity, A and B are adjustable parameters. The validity of this equation in estuarine waters has been examined by using an ion pairing model ( and , 1981). The calculated values of K HA * and K ' HA at S = 35%. are in good agreement with the measured values for all the systems examined. The equation used to extrapolate the measured values to pure water K HA predicted values that agreed with those determined by using the ion pairing model. The exception was the ionization of HPO 4 2- due to the strong interactions of Ca 2+ and Mg 2+ with PO 4 3- . The differences in the predicted values of K HA * in seawater diluted with pure water and average river water were very small for all the acids except HPO 4 2- (the maximum pK = 0.96 in average river water). The larger difference in the K HA * for HPO 4 2- in river waters is due to the strong interactions of Ca 2+ and PO 4 3- .

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