摘要
提出了一种采用毛细管离子色谱法同时测定火电机组水汽中痕量无机阴离子(F-,Cl-,SO2-4,Br-,NO-3,NO-2,PO3-4)和小分子有机酸根(CH3COO-,HCOO-,C2O2-4)的方法:直接进样10μL;采用IonPac AS18(250 mm×0.4 mm)毛细管离子色谱分析柱;流速为0.010mL/min的KOH淋洗液进行梯度淋洗。采用该方法对上述10种痕量阴离子进行测定。结果表明:采用毛细管离子色谱法检测的10种离子标准曲线线性关系良好,相关系数均大于99.9%,以信噪比S/N=3计算,所测离子检出限在0.04~0.80μg/L之间;连续运行96h后相对标准偏差仍在0.03~5.81%,加标回收率81%~116%。检测结果准确可靠,该方法适用于火电机组水汽检测。
A capillary ion chromatography method was proposed,which can detect trace inorganic anions(F-,Cl-,SO2-4,Br-,NO-3,NO-2,PO3-4)and low-molecular-weight organic acids(CH3COO-,HCOO-,C2O2-4)in water and steam from boilers in power plants.The separation was achieved on IonPac AS18(250mm×0.4mm)capillary anions analytical column with optimized KOH gradient elution and 10μL injection at 0.010mL/min,and then each component's concentration was detected by suppressed conductivity.The results show that,under the chosen condition,the linear correlation coefficients of the above 10 anions were greater than 99.9%,the detection of limit with signal-to-noise ratio of 3were between 0.04μg/L and 0.8μg/L.After running for 96 hours,the relative standard deviations(RSDs)were still between0.03% and 5.81%,and the average recoveries ranged from 81%to 116%,indicating this method has better repeatability and accuracy.This detection method can be applied in numbers determination of trace anions and low-molecular-weight organic acids in water and steam of boilers in power plants.
引文
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