Abstract：The concentration of dissolved organic matter(DOM) is an important index to assess natural water quality. Fluorescence measures can be used to scale the DOM loading in natural water in a highly sensitive, highly selective and online way. The relations between the fluorescence intensity and the solution concentration, pH, and metal ion content were studied. The experiment results show that the fluorescence intensity and the solution concentration have a linear relationship when the concentration is below 10 mg·L-1 and the pH is in the range of 6.5-7.5. The metal ions have a strong quenching effect on the fluorescence intensity of DOM, and the quenching effect is correlated with the coodination characters of the ions.
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