大体积进样-离子色谱法测定炉水中痕量阴离子

摘要

提出了大体积进样-离子色谱法测定火电厂炉水中8种阴离子F-、CH3COO-、HCOO-、Cl-、NO2-、NO3-、SO42-及PO43-的含量。水样经AG17-C保护柱及AS17-C分离柱分离,以氢氧化钾溶液为淋洗液进行梯度淋洗,采用抑制电导器检测。8种阴离子的质量浓度均在5.0～50μg·L-1范围内与峰面积呈线性关系,检出限（2S/N）在0.01～0.11μg·L-1之间,测定下限（10S/N）在0.05～0.52μg·L-1之间。方法用于火电厂炉水中8种阴离子的测定,加标回收率在97.8%～107%之间。%The contents of 8 anions (i. e. , F , CH3COO , HCOO , Cl , NO2 , NO3 , SO4^2- and PO4 a )in boiler water at thermal power plants were determined by ion chromatography with sample introduction of large volumes. The protective column (AG17-C) and separation column (AS17-C) were used for separation, and K()H solution with different concentrations were used as eluent for gradient elution. Inhibitory conductivity detection was adopted in the determination. Linear relationships between values of peak area and mass concentration of the 8 anions were kept in the same range of 5.0-50μg·L-1 , with limits of detection (2S/N) and lower limits of determination (10S/N) in ranges of 0. 01-0. 11 μg·L-1and 0. 05-0.52μg·L-1respectively. The proposed method was applied to the determination of 8 anions in boiler water; values of recovery found by standard addition method were in the range of 97.8%-107%.