某电厂国产阴离子色谱低浓度测量准确性改善研究

Improvement of the Accuracy of Low Concentration Measurement by Domestic Anion Chromatography in a Power Plant

摘要: 离子色谱作为核电水质分析中最常用的仪器之一，可以准确、灵敏的测定水中阴、阳离子。某电厂采用某国产离子色谱，但在核电应用场景下存在标准曲线负截距过大，导致低浓度样品测量偏差较大，曲线引入的相对不确定度较大，准确性较差。本研究通过采用低浓度范围标准曲线及对低浓度电导响应值校正后的校正曲线重新对样品进行测量，结果表明采用低浓度范围标准曲线、校正曲线测量偏差较小，引入的相对不确定较小，准确性较修改前有明显改善。

Abstract: Ion chromatography, as one of the most commonly used instruments in nuclear power water quality analysis, can accurately and sensitively determine anions and cations in water. A power plant uses a domestically produced ion chromatography, but the negative intercept of the standard curve is too large in nuclear power application scenarios, which leads to a large measurement bias for low concentration samples, a large relative uncertainty introduced by the curve, and poor accuracy. In this study, the samples were re-measured by using a low concentration range standard curve and a calibration curve corrected for the low concentration conductivity response value, and the results showed that the measurement deviation using the low concentration range standard curve and the calibration curve was smaller, the relative uncertainty introduced was smaller, and the accuracy was significantly improved compared with that before modification.