赵英杰　杨唐　李璞

摘要[目的]研究UV254与COD、TOC相关性及氯离子对测定UV254的影响。[方法]通过对不同浓度的邻苯二甲酸氢钾标准溶液和青岛市某污水处理厂二级出水UV254、TOC、COD进行测定分析其相关性，并分别在溶液中加入一定量的氯化钠，分析氯离子对UV254测定的影响。[结果]在试验条件下，不同浓度的邻苯二甲酸氢钾标准溶液和青岛市某污水处理厂二级出水中UV254与TOC、COD具有很好的相关性，可以作为评价水中的有机物指标；在邻苯二甲酸氢钾标准溶液中不同含量氯离子对UV254与COD、TOC相关性分析影响很小，基本可以忽略；氯离子的存在使污水厂二级出水COD/UV254、TOC/UV254值减小。[结论]用UV254替代COD、TOC评价溶液中有机物含量时，必须与具体水质相结合，才能准确表达有机物含量。

关键词UV254；相关性；氯离子；有机物

中图分类号S181.3文献标识码A文章编号0517-6611（2015）07-253-03

Correlation Analysis of UV254 and TOC/COD and the Influence of Chloride Ions on the Determination of UV254

ZHAO Ying-jie，YANG Tang， LI Pu

（School of Environmental and Municipal Engineering， Qingdao Technological University， Qingdao， Shandong 266033）

Abstract[Objective] The research aims to study correlation between UV254 and TOC/COD and the influence of chloride ions on the determination of UV254. [Method] UV254， TOC and COD of different concentrations of potassium hydrogen phthalate standard solutions and secondary effluent of a sewage treatment plant of Qingdao are analyzed for the correlation. In addition， the influence of chloride ion on measurement of UV254 is analyzed by adding a certain amount of sodium chloride in solution respectively. [Result] Under the experimental conditions， the correlation between UV254 and TOC， COD in different concentrations of potassium hydrogen phthalate standard solution and secondary effluent of a sewage treatment plant of Qingdao is clear. The result can be used as evaluation index of the organic matter in water. In the potassium hydrogen phthalate standard solution， different contents of chloride ions have less impact for UV254 and TOC， COD correlation analysis， and even the impact can be ignored. The values of COD/UV254 and TOC/UV254 are reduced because of the presence of chloride ions. [Conclusion] When UV254 is used to evaluate the organic content of solution instead of COD and TOC， it must be combined with the specific water quality. Only after that can the organic content be accurately expressed.

Key wordsUV254； Correlation； Chloride ion； Organic matter

紫外吸光度（UV254）作为评价和衡量水中有机物的控制参数具有重要意义。日本和欧洲许多国家已将其作为有机物检测的重要水质指标[1]，国内也有在水处理研究中将其作为有机物控制指标[2-3]，目前对有机物的测定分析中，通常将TOC、COD作为有机物常用的控制指标，但由于TOC测定设备昂贵，应用成本高，COD测定时间长、易受还原性无机物影响且对不同有机物氧化程度不一等问题[4]，从长远上看，UV254的测定更具优势和应用前景。

UV254主要表征溶液中芳香性和具有双键结构的物质含量[5]，疏水性的物质易被吸附，而芳香性和具有双键结构的物质是构成疏水性物质的主要组分[6]。……