Abstract

A simple and rapid method is reported for the determination of diethanolamine (DEA) in dehydrogenation reaction solutions. Based on ion chromatography with conductivity detection, the eluent and its concentration, column temperature, and flow rate were optimized. The analysis was done with a cation column and 4.0 mM methanesulfonic acid (MSA) as the eluent at a flow rate of 1.0 mL/min and column temperature of 313 K. Under the optimal conditions, satisfactory linearity was exhibited with a correlation coefficient of 0.9993. The separation of diethanolamine in a high salinity matrix (Na⁺) was completed within 17 minutes. Satisfactory recoveries from 98.01 to 101.64% were obtained for spiked samples with relative standard deviations from 1.20% to 1.58% (n = 5). The detection limit for DEA was 14.37 μg/L. The method was suitable for the determination of diethanolamine (DEA) in the dehydrogenation reaction solutions and may be modified for other alkanolamines in industrial processes.

摘要

报道了一种简单快速测定脱氢反应溶液中二乙醇胺 (DEA) 的方法。以离子色谱结合电导检测为基础，对淋洗液及其浓度、柱温、流速进行了优化。分析采用阳离子色谱柱和 4.0 mM 甲磺酸 (MSA) 作为洗脱液，流速为 1.0 mL/min，柱温为 313 K。在最佳条件下，表现出令人满意的线性，相关系数为 0.9993 . 高盐度基质中二乙醇胺的分离（Na ⁺) 在 17 分钟内完成。相对标准偏差为 1.20% 至 1.58% (n = 5) 的加标样品获得了 98.01% 至 101.64% 的令人满意的回收率。DEA 的检测限为 14.37 μg/L。该方法适用于脱氢反应溶液中二乙醇胺 (DEA) 的测定，并可改进用于工业过程中的其他烷醇胺。