Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5403597 | Journal of Luminescence | 2008 | 6 Pages |
Abstract
A novel chemiluminescence (CL) reaction of chlorophenols (CPs), including 2-chlorophenol (2-CP), 4-CP, 2,4-dichlorophenol (2,4-DCP), 2,4,6-trichlorophenol (2,4,6-TCP) and pentachlorophenol (PCP) was reported, which was based on the oxidation of the phototransformed CPs by N-bromosuccinimide (NBS). It was found that the dye-sensitized phototransformation is a prerequisite for the subsequent CL reaction, and the presence of 1.9Ã10-2 mol Lâ1 Triton X-100 or 3.7Ã10-3 mol Lâ1 CTAB can greatly enhance the CL intensity. A neutral sample solution with the presence of 2Ã10-5 mol Lâ1 fluorescein (FL) was found to be optimum for the phototransformation of 2-CP, 4-CP, 2,4-DCP and PCP, but a lower pH of 5.3 was more suitable for 2,4,6-TCP. Based on the CL reaction, detection limits of 8.6Ã10â8, 1.1Ã10â7, 1.5Ã10-7, 4.6Ã10-8 and 3.0Ã10â5 mol Lâ1 were achieved, respectively, for 2-CP, 4-CP, 2,4-DCP, 2,4,6-TCP and PCP with the optimized conditions in the flow system. The mechanism of the phototransformation and the subsequent CL reaction were preliminarily studied and it was suggested that the singlet oxygen formed in the dye-sensitization process was responsible for the conversion of CPs into light-emitting precursors. These intermediate products were suggested to be peroxide compounds after testing by a luminal-based post-column CL detection experiment.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Junli Zhang, Qijun Song, Xia Hu, Enhui Zhang, Hui Gao,