Abstract
Inherent with the production of crude oil and natural gas, large amounts of water are also produced. This water has to be analyzed to deduce the correct geological formation. Extensive analyses of these highly saline waters are also necessary in connection with water flooding projects or in solving problems of scaling or corrosion. The main interest is often the analysis of anions or cations. Cation analysis is focused on alkali and alkaline-earth ions, plus ammonium. Columns for the simultaneous separation of mono- and divalent cations in one run by ion chromatography (IC) are now available. In analyzing high salinity produced water, one of the problems is the very different concentration ranges of the different analytes. For example, the concentration of lithium or barium is in the low ppm range while the concentration of sodium can be 10 000 ppm or higher. In recent years, we have tested two different separation columns (IonPac CS10 and CS12A) in our laboratory to study the possibility of an alternate IC-based method for the determination of the cations mentioned above.
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