离子色谱-紫外检测法分析p-甲苯磺酸根

Determination of p-toluenesulfonate by ion chromatography with ultraviolet detection

利用离子色谱结合紫外检测的方法分析了t9一甲苯磺酸根离子液体阴离子。样品经处理后，采用季铵型阴离子交换柱分离，紫外检测器检测。考察了检测波长及流动相组成等对离子保留和分离的影响，优化了色谱条件，并讨论了保留规律。在220nm检测波长下，以1．0mmol／L柠檬酸一体积分数15％乙腈（pH5．0）为流动相，流速1．0mL／min，柱温40℃，P-甲苯磺酸根可以较好的分离测定，且常见无机阴离子（Cl^-，NO3^-）不干扰测定。在0．1—50mg／L范围内，线性回归方程的相关系数为0．9992。检出限（S／N=3）为30μg／L，峰面积的相对标准偏差在1％以下。将此方法应用于合成的P-甲苯磺酸根离子液体样品。加标回收率为101％。

In this article, a method of ion chromatography with ultraviolet detection was used in the analysis of ptoluenesulfonate ionic liquid anion. The analyte was separated on a quaternary ammonium type anion exchange column and detected by an ultraviolet detector. The effects of detection wavelength and the composition of the mobile phase on the retention and separation of p-toluenesulfonate were investigated. The chromatographic conditions were optimized, and the retention rules were discussed. At a wavelength of 220 nm, when 1.0 mmo]/L citric acid - 15% （V/V） acetonitrile （ pH 5.0 ） were used as the mobile phase with a column temperature of 40~C and a flow rate of 1.0 mL/min, good determination results could be aequired, and other common inorganic anions （CI-, NO3-） did not interfere with the determination. In the range of 0. 1-50 mg/L, the correlation coefficient of linear regression equation was 0. 9992. The detection limit （S/N = 3） was 30 ixg/L. The relative standard deviation was below 1%. The method was apphed to the analysis of p-toluenesulfonate ionic liquid samples, and the spiked recovery was 101%. The method is reliable, sensitive and highly selective.