| 光谱学与光谱分析 |
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| Spectral Analysis of Formation of Trihalomethanes during Reaction of Tryptophan with Disinfectants |
| HUANG Xin1, WU Xue-fei1, GAO Nai-yun2*, LU Ning3 |
| 1. School of Environment and Chemical Engineering, Shanghai University, Shanghai 200444, China2. State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China3. Shanghai Engineering Research Center of Urban Water Resources, Shanghai 200082, China |
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Abstract UV and fluorescence spectra were applied to analyze the characteristics of reaction of disinfectants (free chlorine, free bromine) with tryptophan, as well as the formation of disinfection byproduct-trihalomethanes (THMs). The results show that disinfecting reaction decrease both the intensity and FRI (fluorescence region integration) of tryptophan. A linear relationship was found between the two indexes. Increasing the ratio of free bromine led to a lowering of FRI, a decrease in UV280 and an increase in UV254. Bromine-substitution ratio of THMs also went up with increasing the ratio of free bromine, whereas the total THMs concentration didn’t follow such mono-increase pattern. Those phenomena are mainly due to a higher substitution but a lower oxidation capacity of free bromine, when compared with free chlorine. A linear relationship between FRI and CHBr3 concentration was found using free bromine alone, which did not exist by dosing ammonia to change the characteristic of disinfectant.
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Received: 2012-03-22
Accepted: 2012-06-20
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Corresponding Authors:
GAO Nai-yun
E-mail: gaonaiyun@sina.com
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