Analysis of the Characters of Chromophoric Dissolved Organic Matter in Water Using Laser Induced Fluorescence and Spectral Fluorescence Signature

摘要

A sort of analytical method of fast diagnosis of chromophoric dissolved matter (CDOM) in water is discussed. The total luminescence spectra (TLS) of CDOM in several types of water samples with laser-induced fluorescence (LIF) measurements using a 405 nm wavelength excitation source were measured in the laboratory, and the spectra of CDOM were pointed out and obtained with spectral fluorescence signature (SFS) technique. The spectrum of water Raman scattering and fluorescence of CDOM were separated from TLS with fitting Gaussian of the least squares method, and the curve of fluorescence peak intensity of CDOM against corresponding concentration of CDOM is showed. High correlation (R2 = 0.93) was observed between concentration of CDOM and fluorescence normalized to water Raman scattering. The results have presented the capability of the LIF technique as an integrated tool for research and observations.