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| Determination of Trace Copper(Ⅱ) in Foods by Kinetic Spectrophotometry with Potassium Bromate-Sodium Dodecyl Benzene Sulfonate System |
| Received:December 24, 2015 Revised:February 29, 2016 |
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| DOI：doi:10.3969/j.issn.2095-1035.2016.02.015 |
| KeyWord:catalytic kinetic spectrophotometry; neutral red；KBrO3；copper(Ⅱ); food |
| Author | Institution |
| SHEN Shujun |
漳州职业技术学院，福建 漳州 |
| LI Shuyan |
漳州职业技术学院，福建 漳州 |
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| Abstract: |
| Based on the catalytic effect of copper(Ⅱ) on the oxidative fading neutral red by potassium bromated (KBrO3) with the surfactant of sodium dodecyl benzene sulfonate (SDBS) in NH3-NH4 buffer solution (pH=9.0), a new catalytic spectrophotometry was presented for the determination of trace copper (Ⅱ). A good linear relationship between the absorbance and the content of Cu (Ⅱ) was obtained at 595nm. Under the optimum conditions, the linear range of Cu (Ⅱ) was 0.012~0.12 μg/mL.. The regression equation was △A=6.995c-0.097 7 with correlation coefficient of 0.999 2. The detection limit was 7.74×10-10 g/mL. The method has been successfully applied to the determination of copper in water and food samples with satisfactory results. The relative standard deviation (RSD，n=6) was 1.8%~2.3%. |
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