建立了离子色谱法测定水质中微量甘油的方法。在酸性条件下，使用高碘酸钠将甘油定量氧化成甲酸，再通过离子色谱法定量检测甲酸根含量，从而折算得到甘油准确含量。甘油衍生化样品用20 mmol/L KOH洗脱液淋洗，淋洗流量为 1.0 mL/min，Dionex IonPac AS15阴离子交换色谱柱分离，抑制型电导检测器检测。衍生化后的甲酸根检出限为0.015 mg/L，对水质样品衍生化后的甲酸根离子在0.5、1.0、2.0、3.0 mg/L加标水平的回收率为96.26%~99.68%，该方法的相对标准偏差为0.39%。结果表明，该方法前处理条件温和、反应速度快、副产物少、灵敏度高、准确度高、重复性好，适用于水质中微量甘油含量的检测。

A method is established for the determination of trace glycerin in water by ion chromatography.Under acidic condition, glycerin is oxidized into formic acid by sodium periodate, and then the content of formate radical is detected quantitatively by ion chromatography, thus the accurate content of glycerin is obtained.The glycerin derived samples are eluted with 20 mM KOH eluent at a flow rate of 1.0 mL·min^-1.The samples are separated by means of Dionex IonPac AS15 anion exchange column and detected by an inhibited conductivity detector.The detection limit of derived formate radicals is 0.015 mg·L^-1, and the recoveries of derived formate ions at concentrations of 0.5, 1.0, 2.0 and 3.0 mg·L^-1 are between 96.26% and 99.68%.The relative standard deviation of this method is 0.39%.It is verified that this method has mild pretreatment conditions, high reaction speed, less byproducts, high sensitivity, high accuracy and good repeatability, and is suitable for the detection of trace glycerin content in water.

王芳(1981-),女,博士,讲师,研究方向为工业分析,wangfangyz@126.com