Study on Determination of Zinc in the Primary Coolant by Graphite Furnace Atomic Absorption Spectrometry
The application of the zinc addition technique in the primary loop of PWR nuclear power plant can effectively reduce the radiation fields outside the reactor core and the personnel radiation dose.Nuclear power plants with the zinc addition technique need to monitor the zinc content in the primary coolant,which is usually determined by inductively coupled plasma emission spectrometry or graphite furnace atomic absorption spectrometry.Graphite furnace atomic absorption spectrometry has low detection limit and high accuracy,but the high concentration of boric acid matrix seriously interferes with the determination.For the first time,ethanol was used as matrix modifier to remove the boric acid and the eliminate interference in the heating process of the graphite furnace in this paper.After verification,the method is effective and fundamentally solves the problems existing in the determination of zinc content in the primary coolant of PWR nuclear power plant by graphite furnace atomic absorption spectrometry.
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