电厂水汽中痕量氯离子检测技术研究新进展

New Research Advances on the Determination of Trace Chloride Ion in Water-steam System at Power Plants

介绍了国内外针对水中痕量氯离子检测技术的研究新进展,包括:离子色谱法、荧光法、电极法、分光光度法、连续流动法、流动注射分析法。提出了流动注射-离子交换预富集-分光光度法测定痕量氯离子研究新成果。该方法实际检出下限达到了1.0μg/L,分析速度2~4样/h,线性回归系数达到了0.999 8。与离子色谱法相比,当水样中痕量氯离子浓度大于10μg/L时,相对误差小于10%;当水样中痕量氯离子浓度小于10μg/L时,相对误差小于20%,具有试剂耗量少、浓缩效率高、分析速度快、重现性好等优点,易于实现在线化。

Research advances in the determination of trace chloride ion were introduced in the paper,including IC, FD,electrode method,spectrophotometry,continuous flow method and FIA. As a new research finding, FIA- On-line ion-exchange concentration- spectrophotometry was introduced. The detection limit of the method is 1.0 μg/L, detec- tion speed is 2 ~ 4 samples/h,linear regression coefficient is 0. 999 8. Comparing with IC ,relative error is less than 10% when the concentration of chloride ion in water sample is greater than 10 μg/L and 20% when less than 10 μg/L. With a series of advantages of low consumption of reagent, higher concentration efficiency, quicker detection speed and good reproducibility, on-line monitoring can be realized easily.