作者：杨璟爱, 关玉春, 韩少强, 赵莉, 陈晨, 王记鲁, 张亚尼

作者单位：天津市生态环境监测中心，天津 300384

关键词：有机酸;离子色谱;化工废液

摘要：

采用电导抑制-梯度淋洗离子色谱法，建立一种同时测定化工废液中乙酸、甲酸、甲磺酸和丙烯酸的方法。将化工废液pH调至碱性后，利用SPE柱快速净化样品，在柱温35 ℃条件下，通过优化的氢氧根梯度淋洗程序，将4种难分离有机酸组分快速有效分离，以抑制型电导检测器检测目标物。4种有机酸的检出限在0.036~0.093 mg/L范围内；6次平行测定相对标准偏差在1.4%~6.1%之间；实际样品加标回收率在91.6%~113%之间。该方法检出限低，标准曲线线性好，精密度高，准确度高，选择性好，可实现复杂基质化工废液中乙酸、甲酸、甲磺酸和丙烯酸等难分离有机酸的快速准确测定，具有良好的应用前景。

Determination of four organic acids in chemical industry waste liquid by gradient elution ion chromatography with suppressed conductivity detection
YANG Jing’ai, GUAN Yuchun, HAN Shaoqiang, ZHAO Li, CHEN Chen, WANG Jilu, ZHANG Yani
Tianjin Eco-Environmental Monitoring Center, Tianjin 300384, China
Abstract: A method for simultaneous determination of acetic acid, formic acid, methanesulfonic acid and acrylic acid in chemical industry waste liquid was developed by gradient elution ion chromatography with suppressed conductivity detection. After the pH of the chemical industry waste liquid was adjusted to alkaline, the sample was quickly purified by SPE column. Under the condition of column temperature of 35 ℃, the four organic acid components that were difficult to separate were separated quickly and effectively under the optimized hydroxide gradient elution. Then the target substance was detected by a repressive conductivity detector. The detection limits of four organic acids were in the range of 0.036-0.093 mg/L. The relative standard deviations of 6 parallel measurements were between 1.4% and 6.1%. The actual recoveries of spiked samples ranged from 91.6% to 113%. This method has the advantages of low detection limit, good linearity of standard curve, high precision, high accuracy and good selectivity. It can achieve the rapid and accurate determination of organic acids, which is difficult to separate, such as acetic acid, formic acid, methanesulfonic acid and acrylic acid, in chemical industry waste liquid with complex component, and has a good application prospect.
Keywords: organic acids;ion chromatography;gradient elution
2021, 47(8):71-76  收稿日期: 2021-02-10;收到修改稿日期: 2021-03-23
基金项目: 生态环境部标准编制项目[2020-20]
作者简介: 杨璟爱(1992-),女,天津市人,工程师,硕士,主要从事实验分析工作
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