石化废水中几种常见有机酸的测定

Determination of several common organic acids in petrochemical wastewater

建立了用离子色谱测定石化废水中常见有机酸:乙酸、丙烯酸、环己甲酸、苯甲酸和对甲基苯磺酸的新方法。采用IonPac AS11-HC阴离子色谱柱,淋洗液为30 mmol/L的NaOH水溶液,淋洗液流速1 mL/min,抑制电流75 mA。样品中其他有机物和常规无机阴离子对乙酸、丙烯酸、环己甲酸、苯甲酸和对甲基苯磺酸的测定干扰小。5种有机酸的峰面积检测下限分别为0.024、0.025、0.094、0.075、0.059 mg/L,峰高检测下限分别为0.029、0.007、0.045、0.025、0.070 mg/L;峰面积的相对标准偏差分别为1.2%、1.1%、5.3%、2.7%、3.3%,峰高相对标准偏差分别为1.7%、0.4%、2.8%、1.6%、4.5%。

A new method has been established for the analysis of acetic acid, acrylic acid,hexahyl carbonic acid, benzoic acid and p-toluenesulfonic acid in petrochemical wastewater by ion chromatography. The IonPac AS11-HC anion chromatographic column is used, and the eluent is 30 mmol/L of NaOH aqueous solution. The eluent flow rate is 1 mL/min and suppression current 75 mA. Other organisms and common inorganic anions in samples have little interference on determination of acetic acid, acrylic acid, hexahyl carbonic acid, benzoic acid and p-toluenesulfonic acid. The detections of peak area lower limit of these organic acids are 0.024,0.025,0.094,0.075,0.059 mg/L, respectively. The lower limit of peak heights examined are 0.029,0.007,0.045,0.025,0.070 mg/L, respectively. The relative standard deviations of the peak areas are 1.2%, 1.1%, 5.3%, 2.7% and 3.3%, respectively, and relative standard deviations of peak heights are 1.7%, 0.4%, 2.8%, 1.6% and 4.5%, respectively.