Fluorescence Exciationemission Matrix Analysis of HAAs Precursor in Huangpu River Water

Abstract:

Three dimesional excitationemission matrix fluroscence spectroscopy (3DEEMs) was used to analyze natural organic matters in raw water from Huangpu River.The 3DEEMs of raw water contain two proteinlike peaks (T)and one humiclike peak(A).The relative high intensity of peak T indicates a heavy pollution.The variation of peak A along with the treatment processes is similar with traditional indexes,such as CODMn,UV254 and total organic carbon (TOC).All measures,which enhanced chlorination such as increasing chlorination reaction time,replacing monochloramine with free chlorine and increasing chlorine dosage,decreased fluorescence characteristic values and consequently increased HAAs amount.By adding bromide ions,oxidation capacity lowered as free chlorine concentration decreased,but halogenation capacity increased because free bromine concentration increased,which led to a buildup of fluorescence characteristic values,as well as a first going up followed by a decline of HAAs amount.3DEEMs is a promising supplement index to better characterize the variation of dissolved organic matters in water.