离子色谱法测定水中4种有机酸

Determination of Four Organic Acids in Water by Ion Chromatography

建立了水样中甲酸、乙酸、丙烯酸和甲基丙烯酸的离子色谱测定方法,采用IonPac AS11-HC阴离子分离柱,以KOH为淋洗液,采用浓度梯度洗脱,可同时测定上述4种有机酸。方法对实际水样中甲酸、乙酸、丙烯酸和甲基丙烯酸的平均加标回收率在80.2%~103.3%,相对标准偏差在5.8%之内,检出限分别为：0.005,0.003,0.005和0.004mg/L;定量下限分别为：0.020,0.012,0.020和0.016mg/L。方法准确、简便、环保,能够满足实际水样的测定需要,且水样中常见的阴离子不会对目标污染物的测定产生影响。

A method for simultaneous determination of formic acid,acetic acid,acrylic acid and methacrylic acid in water samples was proposed.Using IonPac AS11-HC as the anion exchange column and KOH as the eluent,four organic acids were well separated and their concentrations were determined by gradient elution.The mean recovery of the four organic acids was in the range of 80.2%~103.3%,and the relative standard deviations（RSDs）were less than 5.8%.The detection limits were 0.005,0.003,0.005 and 0.004mg/L,and the quantification limits were 0.020,0.012,0.020 and 0.016mg/L,respectively.The method is accurate,convenient and environmentfriendly,and is suitable for the determination of four organic acids in real water samples.Moreover,the existence of common ions does not influence the determination of the contaminants.