| 光谱学与光谱分析 |
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| Study on the Determination of Trace Gallium in Molybdenum-coated Pyrolytic Graphite Tube by Electrothermal Absorption Spectrometry |
| HUANG Yu-an, ZHOU Fang-qin*, LONG Si-hua, YANG Liu |
| College of Chemistry, Xiangtan University, Xiangtan 411105, China |
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Abstract The effects on gallium atomization in the pyrolytic graphite tube imposed by different matrix modifiers and different coatings were discussed detailedly in this paper. In the presence of matrix modifier of Ni(NO3)2 the matrix interference was eliminated efficiently. The pyrolytic graphite tubes were coated differently with lanthanum, zirconium, and molybdenum to avoid producing gallium carbide. Results showed that the tube with molybdenum coating was the best. On this basis, the mechanism of gallium atomization in the molybdenum-coated pyrolytic graphite tube using Ni(NO3)2 as a matrix modifier was studied furthermore; in addition, the parameters of the operation were optimized. As a result, a new method improved in many aspects was developed to detect trace gallium in complicated sample of gangue. The outcomes of practical applications indicated that the method could satisfy the requests of analysis and that the manipulations were simple to achieve. The characteristic content, the detection limit, and the adding recoveries were 2.12×10-11 g, 1.4×10-10 g and 97.4%-102.7% respectively, and the relative standard deviation was less than or equal to 3.6%(n=11).
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Received: 2002-10-16
Accepted: 2003-02-18
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Corresponding Authors:
ZHOU Fang-qin
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| Cite this article: |
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HUANG Yu-an,ZHOU Fang-qin,LONG Si-hua, et al. Study on the Determination of Trace Gallium in Molybdenum-coated Pyrolytic Graphite Tube by Electrothermal Absorption Spectrometry [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2004, 24(02): 238-241.
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| URL: |
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http://www.gpxygpfx.com/EN/Y2004/V24/I02/238 |
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