基于EEMs和UV-Vis法相结合的北方某城市原水三氯甲烷生成预测

Chloroform Formation Prediction in Raw Water of a Northern City Based on the Combined EEMs and UV-Vis Methods

以北方城市某水厂采集的原水作为研究对象,利用三维荧光光谱进行测定,通过计算荧光指数(FI)判断原水中溶解性有机物(DOM)的来源,并考察加氯后的三氯甲烷生成情况与水中DOM紫外-可见分光光谱特性之间的联系。结果表明,当水厂的原水中DOM主要为微生物的代谢产物时,加氯后三氯甲烷的生成量可通过测定溶解性有机物在280 nm处吸光度,进行负对数计算得到-lnA280来反映三氯甲烷生成量,由此提供了一种更加操作简单、成本较低的预测三氯甲烷质量浓度的方法。

The three-dimensional fluorescence spectra were used to determine the origin of dissolved organic matter(DOM)in raw water by calculating the fluorescence index(FI)and to investigate the relationship between the production of trichloromethane after chlorination and the UV-Vis spectral properties of DOM in water.The results showed that when the DOM in the raw water was mainly metabolites of microorganisms,the amount of trichloromethane produced after chlorination could be calculated by measuring the absorbance of the dissolved organic matter at 280 nm and calculating the negative logarithm-lnA280.This provides a simpler and less costly method of predicting the mass concentration of trichloromethane.