Determination of tannic acid in industrial wastewater based on chemiluminescence system of KIO4–H2O2–Tween40

✍ Scribed by Cheng-gen Xie; Huai-fen Li

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 398 KB
• Volume: 25
• Category: Article
• ISSN: 1522-7235
• DOI: 10.1002/bio.1152

✦ Synopsis

Abstract

The oxidation reaction of H~2~O~2~ with KIO~4~ can produce chemiluminescence (CL) in the presence of the surfactant Tween40 and the CL intensity of the CL system KIO~4~–H~2~O~2~–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 O~2~(^1^Δ~g~)O~2~(^1^∑^−^~g~) in the KIO~4~–H~2~O~2~–Tween40 reaction. Tween40 played an important role in enhancing stabilization of the excited oxygen molecular pair O~2~(^1^Δ~g~)O~2~(^1^∑^−^~g~) and in increasing CL intensity. Copyright © 2010 John Wiley & Sons, Ltd.