Abstract: A new method to determine inorganic ions in the water of oil fields by single-column ion chromatography is presented.On an anion-bonded column,using a mixture of sodium benzoate(1.5mM) and sodium citrate(0.1mM) as the eluent,the Cl^-,NO₃^-,and SO₄^2- in the water can be determined.On a cation-bonded column,using 1.5mM HNO₃ as the eluent,the Na⁺ and K⁺ can be determined.If a mixture of oxalic acid and ethylene diamine(both at 1.5mM) is used as the eluent,then Mg²⁺,Ca²⁺,Sr²⁺ and Ba²⁺ 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 determine 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.

Key words: single-column ion chromatography, oil field water, inorganic ions, test, analysis

摘要： 提出了一种用单柱离子色谱法测定油田水中无机离子的新方法.在阴离子键合柱上,用0.5mM苯甲酸钠和0.1mM柠檬酸钠作为洗脱液,可对油田水中的Cl^-、NO₃^-、SO₄^2-进行测定;在阳离子键合柱上,用1.5mM硝酸为洗脱液,可对油田水中的Na⁺和K⁺进行测定;用浓度各为1.5mM的草酸和乙二胺为洗脱液,可对水样中的Mg²⁺、Ca²⁺、Sr²⁺、Ba²⁺进行测定.对于油田水中含量大大高于其它无机离子的Cl^-和Na⁺的测定,可在适当稀释后,再进行测定.本方法具有简便、快速、准确的优点,其测定结果与油田现行使用的方法所测结果基本相符.

关键词: 单柱离子色谱, 油田水, 无机离子, 检测, 分析