【摘要】 建立了用高效液相色谱法同时测定月桂酸钠(SL)和十二烷基苯磺酸钠(SDBS)浓度的方法。所用色谱柱为阴离子交换色谱柱,柱长200mm,内径4 6mm,填料孔径5μm。实验确定流动相A为体积比50∶50的甲醇/水混合物,用稀H3PO4调pH值为4 5,用于洗脱SL;流动相B为含30mmol/LNaH2PO4的甲醇/水(50∶50)混合物,用于洗脱SDBS。SL用示差折光检测器检测,SDBS用紫外检测器在254nm检测。单一SL或SDBS标准溶液浓度测定结果表明,SL和SDBS的可检测浓度范围分别为0 44～31mmol/L和0 31～30mmol/L,峰面积与浓度之间线性相关系数分别为0 9993和0 9990,测定值的相对标准偏差分别为1 1%和0 83%。在不含和含大量盐、碱(0 5mol/LNaCl+0 5mol/LNaHCO3+0 5mol/LNaOH)的SL和SDBS混合标准溶液的色谱图上,SL峰和SDBS峰均完全分离。用所建立的方法测定在95%石英砂+5%高岭土上吸附后SL+NaCl+NaOH和SL+NaCl+NaHCO3溶液中SL的浓度,得到了正常形态的SL吸附等温线(吸附量～平衡浓度关系曲线)。该方法快速,准确,可同时或分别测定含大量无机盐、无机碱溶液中的SL和SDBS。图6参7。更多还原

【Abstract】 A technique of simultaneous quantitative determination of sodium laurate （SL） and sodium dodecyl bezene sulfonate （SDBS） in mixed solutions is developed by using high performance liquid chromatorgraphy （HPLC）. The column used is an anion-exchange chromatorgaphic column 200 mm long and 4.6 mm in inner diameter with pore diameter 5 μm. The methanol/water （50/50 in v/v） mixture with pH=4.5 adjusted by dilute H₃PO₄ is chosen as mobile phase A for eluting SL and the same mixture with 30 mmol/L NaH₂PO₄ added-as mobile phase B for eluting SDBS. SL is detected by differential refractometry and SDBS-by UV-spectrometry at 254 nm. The results of determination of standard SL and SDBS solutions show that the detectable concentration of SL is in range 0.44-31 mmol/L and of SDBS-0.31-30 mmol/L; The concentration of SL in SL+NaCl+NaOH and SL+NaCl+NaHCO₃ solutions after adsorption of SL onto 95% quartz+5% kaolinite having been performed is determined by using this technique and the isotherms of adsorption （adsorption-equilibrium concentration curves） constructed for SL are normal in mode. This technique is fast, accurate and useful for determining SL and SDBS, single or both simultaneously, in salts and alkalines containing surfactant（s） flooding solutions.更多还原