Catalytic Kinetic Fluorophotometric Determination of Chromium(Ⅵ)
摘 要
基于铬(Ⅵ)对过氧化氢与靛蓝胭脂红之间的氧化还原反应的催化作用,对应用此催化反应作为测定痕量铬的催化动力学荧光光度法的基础进行了研究。优化的反应条件如下:在10 mL总体积中依次加入1.0×10-3mol·L-1靛蓝胭脂红溶液1.5 mL,30%(w)过氧化氢溶液0.1 mL及pH 4.0乙酸-乙酸钠缓冲溶液3 mL。在65 ℃条件下反应11 min,迅速冷却至室温。在波长λex 330 nm和λem 415 nm处测其荧光强度,并计算ΔF(F-F0)值。所测得的ΔF值与铬(Ⅵ)的质量浓度在0.001~0.06 mg·L-1范围内呈线性关系。检出限(3s/k)为0.004 4 mg·L-1。应用此法分析了明胶胶囊,并进行了回收试验,测得平均回收率为98.0%。
Abstract
Based on the catalytic action of Cr(Ⅵ) on the redox reaction between H2O2 and indigo carmine, the feasibility to develop a method for fluorophotometric determination of Cr(Ⅵ) on the basis of this catalytic reaction was studied. It was found that when in a solution of total volume of 10 mL, 1.5 mL of 1.0×10-3mol·L-1 indigo carmine solution, 0.1 mL of 30% (w) H2O2 solution and 3 mL of HOAc-NaOAc buffer solution of pH 4.0 were added in succession, and the mixture was heated at 65 ℃ for 11 min, and cooled rapidly to room temperature. When in the presence of Cr(Ⅵ), significant enhancement of fluorescence was observed as measured at λem of 415 nm with λex at 330 nm, and linear relationship between values of ΔF(F-F0) and mass concentration of Cr(Ⅵ) was found in the range of 0.001-0.06 mg·L-1, with detection limit (3s/k) of 0.004 4 mg·L-1. Test for recovery was made with capsule sample as matrixes by standard addition method, value of average recovery found was 98.0%.
中图分类号 O657.3
所属栏目 工作简报
基金项目 陕西省科技厅基金项目(2012JQ2013);咸阳师范学院自然科学基金资助课题(12XSYK024)
收稿日期 2013/7/8
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备注李玉红(1980-),女,陕西咸阳人,工程师,硕士,主要从事分析方面研究。
引用该论文: LI Yu-hong. Catalytic Kinetic Fluorophotometric Determination of Chromium(Ⅵ)[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2014, 50(7): 857~859
李玉红. 催化动力学荧光光度法测定铬(Ⅵ)[J]. 理化检验-化学分册, 2014, 50(7): 857~859
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参考文献
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【2】马卫兴,许兴友,营爱玲.对氨基苯基荧光酮分光光度法测定铬Cr(Ⅵ)[J].冶金分析, 2002,22(5):41-42.
【3】宋仲容,何家洪.铬(Ⅵ)-结晶紫-过氧化氢体系催化动力学光谱法测定痕量铬(Ⅵ)[J].重庆文理学院学报:自然科学版, 2009,28(4):29-32.
【4】刘英华,杨晓华,田宝勇.石墨炉原子吸收法测定空心胶囊中的铬含量[J].中国药房, 2012,23(13):1230-1231.
【5】冯素玲,唐安娜,樊静.荧光分析法测定痕量Cr(Ⅵ)[J].分析化学, 2001,29(5):558-560.
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