Chemiluminescence of ClO3−-SO32−-Rh6G-SDBS System and Its Application to the Determination of Sulfite
Project supported by the National Fund for Distinguished Young Scholars of China (No. 20125514), the National Natural Science Foundation of China (Nos. 20437020, 50273046) and the Major Research Program of Chinese Academy of Sciences (No. KZCX3-SW-432).
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Abstract
Based on the micelle synergism mechanism, a chemiluminescence (CL) flow system for the determination of sulfite was described. The CL signal generated from the reaction of chlorate with sulfite in acidic solution was very weak, while the interfusion of sodium dodecylbenzenesulfonate (SDBS) resulted in a highly chemiluminescent intensity. The major goal of this work was to investigate and develop the SDBS micelle synergetic CL system. The mechanism was proposed and proved by spectrometry. The results indicated that the unique structure of SDBS micelles promoted the aggregation of rhodamine 6G (Rh6G) and a much easier energy transfer, leading to a marked shift to red in the CL emission. This CL system was developed for the determination of sulfite and the concentration of sulfite was proportional to the CL intensity in the range of 5.0×10−8–1.0×10−5 mol/L with the detection limit of 1.7×10−8 mol/L (S/N=3). The relative standard deviation was 3.3% for 1.0×10−6 mol/L sulfite solution with eleven repeated measurements. This method was successfully applied to the determination of sulfite in powder sugar.
