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Simultaneous determination of bismuth and tellurium in nickel-base superalloy by hydride generation-atomic fluorescence spectrometry

ZHANG Xiao-han;MA Chong-xian;LI Sha-sha;Testing Center,Shanghai Research Institute of Materials;Shanghai Municipal Key Lab.of Application and Engineering Materials;  
The sample was dissolved with mixed acid of hydrochloric acid and nitric acid.After heating for pre-reduction in hydrochloric acid medium and controlling the mass concentration of potassium borohydride as 20g/L,the content of bismuth and tellurium in nickel-based superalloy was simultaneously determined by hydride generation atomic fluorescence spectrometry with citric acid and ammonium fluoride as interference inhibitor and hydrochloric acid(1+9)as flow carrier.The results indicated that the fluorescence intensity of both bismuth and tellurium showed good linearity with their mass concentration in range of 2-10μg/L.The detection limit of method for bismuth and tellurium was0.000 3μg/L and 0.002μg/L,respectively.The interference test showed that bismuth and tellurium had no mutual interference when the mass concentration was less than 10μg/L.The interference of cobalt,niobium,molybdenum and copper with bismuth and tellurium could be eliminated by adding5.0mL of 400g/L citric acid solution and 5.0mL of 200g/L ammonium fluoride solution.The interference of matrix nickel and major components(chromium and iron)could be eliminated by matrix matching method.The proposed method was applied to the determination of nickel-based superalloy certified reference materials.The results were consistent with the certified values.The relative standard deviations(RSD,n=6)were not more than 5%.
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