Columbia River alkalinity essentially consists of carbonate alkalinity (94% ) with some silicate alkalinity where dissolved silicate concentration is high. Phosphate and borate contribute insignificantly to the overall alkalinity. The river delivered 2.3 x 10" equivalents of alkalinity to the Pacific Ocean during the water year 1963, or 11 megatons of calcium carbonate.Regardless of high seasonal flow-rate variance, the river alkalinity near the river mouth shows little variation with an average value of 1 mcq/liter.
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