ABSTRACT

Alkalinity and pH is needed in many water treatment calculations, scale, corrosion, precipitation, oxidation, etc., yet the concept is often misunderstood and reliable methods to accurately measure alkalinity are scarce, especially when multiple weak acids are present. A new titration method that is based upon simultaneous analysis of the titration curve determined at fixed conditions, instead of complete reliance on the end points, has been developed and tested for a wide range of natural and synthetic waters. The implication of alkalinity, carboxylic acids, oxidation, and precipitation in scale and corrosion prediction is also discussed.

INTRODUCTION

Good scale and corrosion prediction relies upon precise knowledge of water chemistry ~. For

example, the true value of HCO3 concentration in water is needed for use with calcite Saturation Index.

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