Abstract:

The concent ration of dissolved organic matter (DOM) is an important index to assess natural water quality.Fluorescence fingerprint technique was widely used to characterize dissolved organic matter (DOM) in river from different sources.In this paper，the authors analysised  the fluorescence  spectral characteristics of different series water by fluorescence method.According to the channel transverse，hydrological condition，sewage outfall distribution，and branch status，experimental samples were collected from eight crosssections in the Wanzhou section of the Yangtze River and Zhuxi River.The result showed that  an  expanse fluorescence can be generated from emission wavelengths 350 nm to 550 nm when the ultraviolet excitation wavelengths are 290 nm.The authors also studied the 3dimension fluorescence  spectral characteristics of  different sample of water，different sites.Higher peak values were found in 4#，5# and 2# water sample.In 4# and 5# water samples Dom content is higher due to the pollution of Zhuxi river.But in 2# sample due to upstream  chemical factorys.The peak values are generally related with the point pollution of these regions.Characters of this method are sensitive，simple and fast.It can be an effective measure method of  water quality.

Key words: the Yangtze River/fluorescence spectral/dissolved organic matter (DOM)