RESUMO
OBJECTIVE: The pretreatment method was studied to solve the disagreement of aluminum in the reference substances between detection and the value of the certificate. METHODS: The pretreatment method of wet digestion with nitric acid, microwave digestion of hydrogen fluoride and dry ashing at different temperatures were used to determine aluminum in the reference substances by plasma emission spectrometry. RESULTS: Pretreatment method affected the test result of aluminum in reference substances directly. The result showed that wet digestion with nitric acid and dry ashing at 500-550 â could not reach the value of the certificate of reference substances, meanwhile microwave digestion of hydrogen fluoride( HNO_3-HF-H_2O_2= 8 : 1 : 1, V/V/V) and dry ashing at more higher temperature( 800-950 â) could meet the testing requirements. CONCLUSION: The determination of aluminum in reference substances is recommended by hydrofluoric acid system digestion or higher temperature ashing method to ensure the accuracy of the test result.