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以溴甲酚绿作指示剂 ,氯仿为油相 ,水、被测阴离子表面活性剂、标准阳离子表面活性剂以及Na3PO4 -Na2 HPO4 缓冲剂组成水相 ,当体系总体积和两相体积比固定时 ,过量的阳离子与溴甲酚绿形成蓝绿色复合物溶于氯仿相 ,在 6 30nm处产生最大吸收。当阳离子浓度固定不变时 ,氯仿层吸光度随阴离子浓度增加线性下降。据此可作出工作曲线 ,用于常用阴离子表面活性剂的微量分析。应用于 1× 10 -6mol/L～2× 10 -5mol/L (约 0 5mg/L～ 10mg/L)重烷基苯磺酸盐和羧酸盐 (肥皂 )浓度的测定 ,工作曲线的线性相关系数达到 0 998,并具有良好的重现性和回收率
With bromocresol green as an indicator, chloroform as oil phase, water, anionic surfactant, standard cationic surfactant and Na3PO4-Na2 HPO4 buffer make up the aqueous phase. When the total volume and the volume ratio of two phases are fixed , An excess of cations and bromocresol green to form a blue-green complex dissolved in the chloroform phase, the maximum absorption at 630nm. When the cation concentration is constant, the chloroform layer absorbance decreases linearly with the anion concentration. Based on this work curve can be made for the commonly used anionic surfactant microanalysis. The concentration of heavy alkylbenzene sulfonate and carboxylate (soap) in 1 × 10 -6 mol / L ~ 2 × 10 -5 mol / L (about 0 5 mg / L ~ 10 mg / L) The correlation coefficient reached 0 998 with good reproducibility and recovery