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一回路冷却剂中锂浓度的测量是核电厂化学部门的日常工作之一,目前核电行业内主要使用火焰原子吸收光谱法测量锂浓度,但由于基体硼元素的干扰、仪器的灵敏度过高等原因给准确测定锂浓度带来很大困难,本文通过改变仪器硬件配置、优化分析条件,结合待测溶液基体硼浓度范围,在大量实验数据的基础上提出使用基体硼浓度不同的三条标准曲线分段测量一回路冷却剂中锂浓度的方法,结果表明:所建立方法的准确性、精密度和长期稳定性均满足对一回路冷却剂中锂浓度的测量要求,所建立方法可靠、简便、实用。
The measurement of lithium concentration in the primary circuit coolant is one of the routine work of nuclear power plant chemical department. At present, the nuclear power industry mainly uses flame atomic absorption spectrometry to measure the lithium concentration. However, due to the interference of matrix boron element and the high sensitivity of the instrument, Therefore, it is very difficult to accurately measure the lithium concentration. Based on a large amount of experimental data, the three standard curves of different concentrations of boron in the matrix are used to segment the measurement by changing the hardware configuration of the instrument, optimizing the analysis conditions and combining with the boron concentration range of the solution to be tested. The results show that the accuracy, precision and long-term stability of the proposed method meet the requirements for the lithium concentration measurement in the primary coolant. The established method is reliable, simple and practical.