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考察酪氨酸在不同投氯量条件下氯化后的余氯,紫外吸光度值和荧光光谱,以及消毒副产物对羟基苯乙腈(4-HBC)的生成特性。结果表明,随着投氯量的增加,余氯呈现先增加再减小再增加的趋势。在投氯量为0～0.5 mmolCl2/L时,增加投氯量可提高氯化后溶液的UV254、UV274和UV280值以及4-HBC的生成量,表明低投氯量时氯化可提高溶液中不饱和键的含量;而投氯量为0.5～1 mmol Cl2/L时,增加投氯量降低UV254、UV274和UV280值以及4-HBC的生成量,表明过量的氯亦可破坏溶液中的不饱和键。荧光光谱测试实验亦发现:在投氯量为0.05 mmol Cl2/L时,酪氨酸溶液氯化后的荧光峰强度明显增加,表明氯化可生成荧光强度较高的产物。过量的氯(0.5～1 mmol Cl2/L)则可破坏溶液中的荧光结构,降低荧光峰强度直至未检出。
The residual chlorine, UV absorbance and fluorescence spectra of tyrosine after chlorination under different dosage of chlorine were investigated. The formation of 4-HBC was also studied. The results showed that with the increase of the dosage of chlorine, residual chlorine showed the trend of first increasing, then decreasing and then increasing. When the dosage of chlorine is 0 ~ 0.5 mmolCl2 / L, increasing the dosage of chlorine increases the values of UV254, UV274 and UV280 and the amount of 4-HBC in the solution after chlorination, indicating that chlorination can increase the content of While the amount of chlorine added reduced the UV254, UV274 and UV280 values as well as the amount of 4-HBC produced when the amount of chlorine was 0.5-1 mmol Cl2 / L, indicating that excess chlorine could also destroy the solution Saturated key. Fluorescence spectroscopy test also found that the fluorescence peak intensity of tyrosine solution after chlorination increased obviously when the amount of chlorine was 0.05 mmol Cl2 / L, indicating that chlorination can produce products with higher fluorescence intensity. Excess chlorine (0.5 ~ 1 mmol Cl2 / L) can destroy the fluorescent structure in the solution and reduce the fluorescence peak intensity until it is not detected.