| 双指示剂催化动力学测定痕量铬-Cr（Ⅵ）-H2O2-次甲基蓝-罗丹明B体系 |
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| 引用本文： | 耿明,朱庆仁.双指示剂催化动力学测定痕量铬-Cr（Ⅵ）-H2O2-次甲基蓝-罗丹明B体系[J].淮北煤师院学报,2009(3):32-35. |
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| 作者姓名： | 耿明 朱庆仁 |
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| 作者单位： | 淮北煤炭师范学院化学与材料科学学院,安徽淮北235000 |
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| 基金项目： | 安徽省高校省级自然科学基金（2005KJ140） |
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| 摘 要： | 在pH4．8的HAc-NaAc缓冲溶液介质中，利用痕量铬（Ⅵ）催化H2O2氧化次甲基蓝和罗丹明B褪色的指示反应，通过测量在555nm和665nm下催化体系和非催化体系吸光度的变化，建立双波长双指示剂催化动力学光度分析测定痕量铬（Ⅵ）的新方法．方法的线性范围为0．025-1．40μg／25mL，检出限为5．2×10^-10g／mL．该法简单、灵敏度高、选择性好，用于废水中痕量铬（Ⅵ）的测定，结果满意．
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| 关 键 词： | 铬 催化光度法 双波长 双指示剂 次甲基蓝 罗丹明B |
Dual- indicator Catalytic Kinetic Spectrophotometric Determination of Chromium - Cr （Ⅵ） - H2O2 - Methylene Blue - Rhodamine B System |
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| GENG Ming,ZHU Qing-ren.Dual- indicator Catalytic Kinetic Spectrophotometric Determination of Chromium - Cr （Ⅵ） - H2O2 - Methylene Blue - Rhodamine B System[J].Journal of Huaibei Teachers College(Natural Sciences Edition),2009(3):32-35. |
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| Authors: | GENG Ming ZHU Qing-ren |
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| Institution: | ( School of Chemistry and Material Science, Huaibei Coal Industry Teachers College, 235000, Huaibei, Anhui, China) |
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| Abstract: | A dual - wavelength dual - indicator catalytic kinetic spetrophotometric method for the deter ruination of trace chromium was studied. It was based on the catalytic effect of chromium（ Ⅵ ） on the oxidation of methylene blue and rhoda mine B by hydrogen peroxide in HAc- NaAc buffer medium at pH 4. 8. The absorbance of catalytic system and uncatalytic system were measured at 555 nm and 665 nm. Under the optimum conditions, the linear range of the deter mination of trace chromium（ Ⅵ ） was 0. 025 - 1.40 μg/25 mL. The detection limit was 5.2 × 10^-10 g/mL. The method is simple, high sensitivity and good selectivity. The method was applied to the determination of trace chromium（Ⅵ） in waste water with satisfactory results. |
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| Keywords: | chromium catalytic spectrophotometry dual - wavelength dual - indicator methylene blue rhodamine B |
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