An analytical method for the determination of lithium and magnesium in superalloys by flame atomic absorption spectrometry was established.The samples were dissolved with hydrochloric acid,nitric acid and hydrofluoric acid,and Li670.78nm and Mg285.21nm were selected as the analytical spectral lines of the elements to be measured.The optimal instrument parameters were studied,and the effects of matrix and co-existing elements on the determination of lithium and magnesium were studied.The results show that the influence of matrix and co-existing elements can be eliminated by standard addition method.Under the optimal test conditions,the RSD of lithium is less than 10%,the detection limit is 0.0001%,and the recovery rate of standard addition is 97%～115%;the RSD of magnesium is less than 10%,the detection limit is 0.00002%,and the recovery rate of standard addition is 80%～110%.The method has high precision and good accuracy.It can be used to determine the content of lithium and magnesium in superalloy.
关键词
火焰原子吸收光谱法/高温合金/锂/镁
Key words
Flame atomic absorption spectroscopy/Nickel base superalloys/Lithium/Magnesium
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