This paper establishes a high-temperature hydrolysis-ion selective electrode method for the determination of trace fluorine and chlorine in uranium dioxide samples.The high-temperature hydrolysis method is used to volatilize the fluorine and chlorine elements in the sample in the form of acids with a moist oxygen flow.After condensation,they are trapped in the buffer solution in the form of chlorides and fluorides.The content of fluorine and chlorine in the sample distillate is determined separately by the ion selective electrode method.The experiment completes the selection of hydrolysis time and oxygen flow detection conditions,and obtains the practical application of the determination of fluorine and chlorine content in uranium dioxide samples.The results show that the relative standard deviations of the fluorine and chlorine determination results in uranium dioxide samples are 5.5％and 4.2％,respectively.
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