This paper describes two new methods for determining equivalent NaCl concentration from a chemical analysis. One method applies to analyses reporting the molecular concentrations of dissolved salts; the second method applies to analyses reporting ionic concentrations. The empirical conductivity-concentration relationships of the various pure salt solutions are utilized to explain the concept of equivalent NaCl concentration. These relationships also are utilized to describe the fundamental considerations entering into the development of these new methods. The basic differences between these methods and the currently used Dunlap method are illustrated. The suitability of these methods to rapid and accurate graphical solutions is illustrated by several examples. For the wide range of concentrations and compositions encountered by the 190 natural and synthetic formation water samples used in this study, the equivalent NaCl concentrations obtained by these new methods did not differ by more than ?5% from the measured values.

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