Department of Chemistry and Life Science, West Anhui University, Lu'an, People's Republic of China.
Luminescence. 2010 Sep-Oct;25(5):350-4. doi: 10.1002/bio.1152.
The oxidation reaction of H₂O₂ with KIO₄ can produce chemiluminescence (CL) in the presence of the surfactant Tween40 and the CL intensity of the CL system KIO₄-H₂O₂-Tween40 can be strikingly enhanced after injection of tannic acid. On this basis, a flow injection method with CL detection was established for the determination of tannic acid. The method is simple, rapid and effective to determine tannic acid in the range of 7.0 × 10(-9) to 1.0 × 10(-5) mol/L with a determination limit of 2.3 × 10(-9) mol/L. The relative standard deviation is 2.6% for the determination of 5.0 × 10(-6 )mol/L tannic acid (n = 11). The method has been applied to determine the content of tannic acid in industrial wastewater with satisfactory results. It is believed that the CL reaction formed singlet oxygen (1)O(2)* and the emission was from an excited oxygen molecular pair O₂(¹Δ(g))O₂(¹∑⁻(g)) in the KIO₄-H₂O₂-Tween40 reaction. Tween40 played an important role in enhancing stabilization of the excited oxygen molecular pair O₂(¹Δ(g))O₂(¹∑⁻(g)) and in increasing CL intensity.
在表面活性剂吐温 40 的存在下，H₂O₂与 KIO₄ 的氧化反应可以产生化学发光（CL），并且在注入单宁酸后，CL 体系 KIO₄-H₂O₂-Tween40 的 CL 强度可以显著增强。在此基础上，建立了一种基于 CL 检测的流动注射法来测定单宁酸。该方法简单、快速、有效，可在 7.0×10(-9)至 1.0×10(-5) mol/L 的范围内测定单宁酸，测定下限为 2.3×10(-9) mol/L。对于 5.0×10(-6 mol/L 单宁酸（n=11）的测定，相对标准偏差为 2.6%。该方法已用于测定工业废水中的单宁酸含量，结果令人满意。据信，CL 反应形成单重态氧（1）O(2)*，发射来自 KIO₄-H₂O₂-Tween40 反应中激发氧分子对 O₂(¹Δ(g))O₂(¹∑⁻(g))。吐温 40 在增强激发氧分子对 O₂(¹Δ(g))O₂(¹∑⁻(g))的稳定性和增加 CL 强度方面发挥了重要作用。
