Determination of tannic acid in industrial wastewater based on chemiluminescence system of KIO₄-H₂O₂-Tween40.
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.
Xie
Cheng-gen
CG
Department of Chemistry and Life Science, West Anhui University, Lu'an, People's Republic of China.
Li
Huai-fen
HF
D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000032:analysis*; D049449:Luminescence; D008163:Luminescent Measurements / Q000295:instrumentation; D010084:Oxidation-Reduction; D010504:Periodic Acid / Q000737:chemistry*; D011136:Polysorbates / Q000737:chemistry*; D017680:Potassium Compounds / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry; D013634:Tannins / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D007220:Industrial Waste; D011136:Polysorbates; D017680:Potassium Compounds; D013501:Surface-Active Agents; D013634:Tannins; D014874:Water Pollutants, Chemical; D010504:Periodic Acid; D006861:Hydrogen Peroxide; C037192:potassium periodate; C068430:polysorbate 40