利用石油羧酸盐与磺酸盐在不同酸碱性条件下不同的存在形式 ,研究并建立了石油羧酸盐 磺酸盐复配体系中两种表面活性剂含量的测定方法 ,即分步滴定的方法。用溴甲酚绿碱性分相滴定法测定体系中表面活性剂的总含量 ,用百里酚蓝 次甲基蓝酸性分相滴定法测定体系中磺酸盐的含量 ,从总含量中扣除磺酸盐的含量即为羧酸盐的含量。该方法操作简便、快速、可靠性强 ,已成功运用于室内驱油实验研究。体系中无机盐和聚合物的存在对测定结果影响不大 Using petroleum carboxylate and sulfonate in different forms under different acid-base conditions, the determination of the content of two surfactants in the petroleum carboxylate sulfonate complex system was studied and established. The method of titration Methods. The total content of surfactants in the system was determined by bromocresol green alkaline phase-separation titration method. The content of sulfonate in the system was determined by the thymol blue methylan blue acid titration method, and the content of sulfonate Acid salt content is the content of carboxylate. The method is simple, rapid and reliable, and has been successfully applied to indoor oil displacement experiments. The presence of inorganic salts and polymers in the system has little effect on the determination results