Abstract
A class of probability models is proposed for making inferences about the regional distribution of lake alkalinity. This class includes the three-parameter lognormal distribution which is frequently used as a regional model for lake chemistry. The adequacy of the lognormal distribution can be assessed by testing the significance of a single parameter in the proposed model. It is shown that the three-parameter lognormal does not fit the majority of data sets from Eastern Canada. Furthermore, the pH-alkalinity relationship developed by Small and Sutton is used to yield a class of probability models representing the derived distributions for pH. It is shown that there is an improved agreement between the pH-alkalinity relationship and the observations when the water colours are less than or equal to 30 Hazen units.
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