【摘要】 提出了采用离子色谱法同时检测热力系统水汽中的甲酸、乙酸、丙酸、丁酸、乳酸及无机阴离子。选用IonPac AS11-HC阴离子分析柱对样品进行分离,并用KOH溶液作为淋洗液进行梯度淋洗。研究表明,9种组分的质量浓度在0.05～0.8 mg/L范围内呈线性,方法检出限为0.009～0.02 mg/L,各组分测量值精密度为0.77%～1.50%。采用该方法测定腐殖酸的高温分解水样,并进行实际样品回收率试验,测得回收率在85.0%～110%。更多还原

【Abstract】 This study proposed a new method for simultaneous determination of formic acid,acetic acid,propionic acid,butyric acid,lactic acid and inorganic anions in the steam by ion chromatography. The chromatographic separation was performed on the IonPac AS11-HC analytical column. Meanwhile, KOH solutions with various concentrations were used as eluent in the gradient elution. Results showed that there was a linear relationship when the mass concentration of nine components was in the range of 0.05-0.8 mg/L. Besides, the detection limit of this method was 0.009-0.02 mg/L, and the precision was between 0.77%-1.50%. Finally, the method was applied to measure the decomposition products of humic acid, and the standard addition recoveries were 85.0%-110%.更多还原