火焰原子吸收光谱法测定氯化物型油田水中的铷和铯

Determination of Rubidium and Cesium in Chloride Type Oilfield Water by Flame Atomic Absorption Spectrometry

采用火焰原子吸收光谱法，进行了氯化物型油田水中微量Rb和Cs分析方法的改进，考虑了复杂油田水体系中共存的K；Na，Ca，Mg等离子的干扰，在模拟的油田水体系中对Rb和Cs的分析进行了标准加入法和标准曲线法的对比实验，同时对柴达木盆地南翼山地区的油田水样品进行了分析。模拟油田水分析结果表明，采用标准加入法测定时，Rb的分析结果较差，Cs的分析结果较好；采用改进后的标准曲线法测定时，在测定的线性范围内，Rb和Cs均能准确测定。实际油田水样品的分析结果进一步表明，在所使用仪器的工作条件下，测定Rb时宜采用标准曲线法，加标回收率在90％～110％之间；测定Cs时两种方法均适用，加标回收率也在90％～110％之间。

Flame atomic absorption spectrometry （FAAS） was applied to the determination of rubidium and cesium in chloride type oilfield water by considering the interferences of the coexistent K^＋ , Na^＋ , Ca^2＋ , and Mg^2＋ ions, Standard curve method and standard addition method were compared in the determination of rubidium and cesium in the simulated oilfield water and the real oilfield water from the Nanyishan region in Qaidam Basin Although rubidium and cesium have similar physical-chemical properties, they present different characters during their analyses using the FAAS technique. When the standard addition method was used for the determination of rubidium and cesium in the simulated oilfield water, the results of rubidium were very poor, whereas the results of cesium were satisfactory. When the standard curve method was used for the determination of rubidium and cesium in the simulated oilfield water, the results of both rubidium and cesium were satisfactory within the linear ranges of the standard curves. For the real oilfield water, standard addition method is also only applicable for the determination of cesium with a recovery ranging from 90% to 110%. While standard curve method is applicable for the determination of both rubidium and cesium with a recovery ranging from 90% to 110%.