| 光谱学与光谱分析 |
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| Study on Determination of Trace Copper(Ⅱ) by Catalytic Kinetic Discoloring Spectrophotometry |
| ZHENG Huai-li1, LONG Teng-rui2，ZHU Yan1 |
1. Faculty of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
2. Faculty of Urban Construction and Environment Engineering, Chongqing University, Chongqing 400045, China |
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Abstract A kinetic spectrophotometric method for the determination of trace Cu(Ⅱ) was developed in this paper. This method is based on the discoloring oxidation reaction between malachite green and hydrogen peroxide catalyzed by copper(Ⅱ) in the medium of HCl solution. The influential factors of reaction and the optimum conditions for the determination of Cu2+ were investigated in detail. The decrease in absorbance was measured at 615 nm at fixed time intervals. The linear determination range is between 0 and 22 μg·L-1 of copper(Ⅱ). A detection limit of 1.92 μg·L-1 is achieved. The catalytic and non-catalytic reactions are the first-order on copper(Ⅱ), in the reaction time interval 15-20 min at 70℃. The apparent activation energy of the catalytic reaction is 122.3 kJ·mol-1. The apparent rate is 7.70×10-4 s-1. The Relative Standard Deviations(RSD) are 1.16% and the recoveries are 98.3%-100.3%. By masking Fe(Ⅲ) ion with PO3-4, the method can be applied to the determination of copper in water sample and foodstuffs with satisfactory results.
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Received: 2003-01-26
Accepted: 2003-06-06
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Corresponding Authors:
ZHENG Huai-li
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| Cite this article: |
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ZHENG Huai-li,LONG Teng-rui,ZHU Yan. Study on Determination of Trace Copper(Ⅱ) by Catalytic Kinetic Discoloring Spectrophotometry [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2004, 24(01): 114-117.
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| URL: |
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http://www.gpxygpfx.com/EN/Y2004/V24/I01/114 |
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