| 光谱学与光谱分析 |
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| Determination of Micro Amount of Tellurium(Ⅳ) in Crude Selenium Sample by Kinetic-Specatrophotometry |
| ZHANG Yu-yang1,2,DENG Gui-chun1*,ZHANG Xin1, XING Nan-nan1,WANG Wei1,ZHANG Qian1 |
1. College of Chemistry,Liaoning University,Shenyang 110036,China
2. College of Chemistry,East China Normal University,Shanghai 200062,China |
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Abstract A new indicator reaction based on the interaction of sodium sulfide reducing properties with methylene blue in cetyltrimethylammonium bromide pH 3.8 acetic acid buffer solution. was put forward to determine micro amount of tellurium. The effect of concentration of reaction substances,acidity,interfering ions etc. on the analytical results was studied. The apparent activation energy is 68.94 kJ·mol-1 and the constant of reaction rate is 1.63×10-2 s-1. Beer’s law is obeyed for tellurium in the range of 20-220 ng·mL-1. The regression equation is y=0.003 8x+0.219 1 and the correlation coefficient is r=0.999 5. The limit of detection for Te is 3.04 ng·mL-1. The method was applied to the determination of Te in crude selenium sample,and the relative standard deviation is 3.1%(n=7). The recovery was between 98.4% and 100.4%.
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Received: 2006-12-02
Accepted: 2007-03-08
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Corresponding Authors:
DENG Gui-chun
E-mail: dgclnu@163.com
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