用溴甲酚绿碱性分相滴定法测定石油磺酸盐的质量浓度

Determining Concentration of Petroleum Sulfonate by Two—Phase Alkaline Titration with Bromacresol Green Indicator

探讨用溴甲酚绿碱性分相滴定法测定石油磺酸盐的质量浓度。该法采用了碱性乙醇—水系溶剂,以溴甲酚绿作指示剂,用磷酸缓冲溶液来调节pH,并用阳离子表面活性剂溶液进行滴定,从而测定出石油磺酸盐的质量浓度。实验测得值与样品参考值误差较小,此方法用来测定石油磺酸盐的质量浓度是可行的。此外,本实验研究了指示剂的用量、有机相溶剂的选择及用量、缓冲溶液用量、无机盐、醇、碱、聚合物、多重综合因素对测定结果的影响,并研究了此方法的测定范围以及可靠性验证。

It is presented in this paper to determine the concentration of petroleum sulfonate by two-phase alkaline titration with bromacresol green indicator. In the alkaline dehydrated alcohol-water system, with bromocresol green as indicator, with phosphoric acid buffer solution to adjust p H value, and titration with the cationic solution, so as to determine the mass concentration of petroleum sulfonate. The error of experimental measured results and reference value is small, so the method is used to determine the concentration of petroleum sulfonate is feasible. In addition, this experiment studied influence on experimental determination which is the dosage of the indicator, the selection and dosage of organic solvent phase, the volume of buffer solution, inorganic salt, alcohol, alkali, polymer and multiple comprehensive factors. Last it studied the method of measuring range, and reliability test.