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为解决压水堆(PWR)核电站一回路冷却剂系统中硼酸溶液对锂含量测定的影响,对原子吸收法进行了改进。当样品的硼含量小于1000 mg/kg时,使用500 mg/kg硼基体标准工作液,并在样品中加入65 mg/kg的硝酸进行测定;如果样品的硼含量大于1000 mg/kg时,须将样品进行稀释,使稀释后的样品中硼含量小于1000 mg/kg,然后按照硼基体含量小于1000 mg/kg的样品进行测定。测定实际样品L1RCP的精密度为0.48%,回收率为100%,结果证明方法可行。
In order to solve the influence of boric acid solution on the determination of lithium content in the primary coolant system of PWR nuclear power plant, the atomic absorption method was improved. When the boron content of the sample is less than 1000 mg / kg, the standard working solution of 500 mg / kg boron matrix is used and the sample is treated with 65 mg / kg nitric acid. If the sample contains more than 1000 mg / kg boron, The sample is diluted so that the boron content in the diluted sample is less than 1000 mg / kg and then measured in samples with a boron matrix content of less than 1000 mg / kg. The determination of the actual sample L1RCP precision of 0.48%, the recovery rate of 100%, the results show that the method is feasible.