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《ROCK AND MINERAL ANALYSIS》 2000-02
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Determination of Trace Aluminum in High purity Magnesium by Probe Atomization Graphite Furnace Atomic Absorption Spectrometry

HOU Shu en 1, CHANG Cheng 1, WANG Ya ping 2 (1. Central Laboratory, China University of Geosciences, Wuhan 430074, China; 2. National Research Center of Geoanalysis, Beijing 100037, China)  
A method for the determination of trace aluminum in high purity magnesium by probe atomization graphite furnace atomic absorption spectrometry has been developed. The magnesium in the sample is transferred into Mg(NO 3) 2 and applied as a matrix modifier that can further improve the analytical performance of Al. The instrument operating conditions and determination conditions are optimized. The experimental results show that the ashing temperature is increased observably and the optimum atomization temperature is decreased when Mg(NO 3) 2 is used as matrix modifier for the determination of Al. The detection limit for Al is 2.2×10 11 g. The method has been applied to the determination of Al in 4 high purity magnesium reference samples. The results are in agreement with recommended values with precision of 3.4%~11% RSD ( n =6).
【Fund】: 国土资源部九五重点科技基金项目 !(95 0 5 6 16 - 3.4)
【CateGory Index】: O657.31
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