Ammonium rhenate samples have the characteristics of high rhenium matrix and low content of impurity ele-ments. If the rhenium matrix is not treated effectively,direct digestion of the sample and determination of impurity elements under ICP-AES will make the determination results inaccurate and cause equipment pollution. In the experiment,some im-purity ions were dissolved by nitric acid and complex with tartaric acid,then tributyl phosphate (TBP) and trialkyl tertiary amine ( N235) were separated by a mixed extractant to achieve the separation of matrix rhenium and impurity elements and eliminate the matrix effect,and then the impurity elements were determined by inductively coupled plasma spectrometry ( ICP-AES) . The results show that the detection limits of aluminum,arsenic,bismuth and other impurities are 0.008～0.07 ug/mL,and the lower limit of the method is 0.0003％～0.005％. The test method was applied to determine the actual ammonium rhenate samples,and the test results were basically consistent with that of inductively coupled plasma mass spectrometry ( ICP-MS) . The relative standard deviation of the test results for the determination of impurity elements was 5.27％～10.32％. The results indicate that the content of impurity elements in ammonium rhenate can meet the requirement of laboratory precision after extraction of rhenium with tributyl phosphate and N235 system.
extraction and separationammonium rhenateICP-AESquantitative detectionimpurity element
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