水中常见阴离子和有机酸的离子色谱分析方法研究

Analysis of Anions and Organic Acid in Water by Ion Chromatography with Suppressed Conductivity

建立了同时测定水样中常见阴离子和有机酸的电导抑制-离子色谱分析方法。以阴离子交换色谱柱（IonPac AS11）（250mm×4.0mm）和IonPac AG11（50mm×4.0mm）为分离柱和保护柱,进样25μL,以7.5mmol/L NaOH为淋洗液,0.7mL/min的流速淋洗,抑制电导检测。分析测定了水样中氯乙酸、Cl-、NO-2、NO-3、琥珀酸、酒石酸、SO2-4、草酸的含量。结果表明：该方法在20min内能完成分析检测;加标回收率值为72.25%～109.69%,相对标准偏差（RSD）值〈5%。通过该方法分析检测了昆明市呈贡新区河流水和湖泊水,结果较为满意。

A comprehensive analytical method based on solid phase extraction-Ion chromatography（SPEIC）was established for the determination of inorganic anions and organic acids in environmental water.The chloroacetate,Cl-,NO-2,NO-3,succinate,tartrate,SO2-4and oxalate in water samples were detected by IonPac AS11（250mm×4.0mm）and IonPac AG11（50mm×4.0mm）as ion exchange column and guard column with a 25μL injection loop and the aluant of 0.7mL/min of 7.5mmol/L NaOH solution under suppressed conductivity.The results showed that the analysis method could be completed within 20 min.The recovery was in the range of 72.25%～109.69%,the linear correlation coefficients were in the range of 0.9987～0.9999 and the relative standard deviation（RSD）was ≤5%.The method is simple,rapid and accurate.Satisfied analysis results were obtained for the detection of Kunming Chenggong New Area river water and lake water.