Determination of inorganic ions in oil field waters by single-column ion chromatography

摘要

A new method to determine inorganic ions in oil field water by single-column ion chromatography is presented. On an anion-bonded column, using a mixture of sodium benzoate (1,5 mM) and sodium citrate (0.1 mM) as eluent, the CI~-, NO_3~-and SO_4~(2-) in oil field water can be determined. On a cation-bonded column, using 1.5 mM HNO_3 as eluent, the Na~+ and K~+ in oil field water can be determined. If a mixture of oxalic acid and ethylene diamine (both at 1.5 mM) is used as the eluent, then Mg~(2+) , Ca~(2+), Sr~(2+) and Ba~(2+) can be determined. If the content of Cl~- and Na~+ is much higher than that of other inorganic ions, the sample may be diluted to allow the determination of these ions. The proposed method is characterized by its simplicity, rapidity and accuracy. The results match those obtained with the current procedures used in oil fields.