Alkaline

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Merriam-Webster Online Dictionary
alkaline (adjective)
of, relating to, containing, or having the properties of an or alkali metal - alkali basic , especially of a solution having a pH of more than 7
Alkaline (Wikipedia)
Not to be confused with Alkali.
"Alkaline" redirects here. For the power cell, see Alkaline battery.
For other uses, see Alkali (disambiguation).
Sea surface alkalinity (from the GLODAP climatology).

Alkalinity is the name given to the quantitative capacity of an aqueous solution to neutralize an acid. Measuring alkalinity is important in determining a stream's ability to neutralize acidic pollution from rainfall or wastewater. It is one of the best measures of the sensitivity of the stream to acid inputs. There can be long-term changes in the alkalinity of streams and rivers in response to human disturbances.

Alkalinity is related to the pH of a solution (its basicity), but measures a different property. Roughly, the alkalinity of a solution is a measure of how "strong" the bases are in a solution, whereas the pH measures the "amount" of chemical bases. A good example is a buffer solution, which can have many available bases (high alkalinity) despite having only a moderate pH level.