4:35 PM - 4:50 PM
[3J15] Evaluation of the interaction between deep groundwater natural organic matter and metal ions using fluorescence spectroscopy and multivariate analysis
Keywords:Geological disposal, Natural Organic Matter(NOM), Fluorescence spectroscopy, PARAFAC, Quenching
It is known that natural organic matter (NOM) changes its migration behavior by complex formation with radionuclides. For the surface NOM, a model that can express the bond with metal ions under various conditions has been proposed. In order to use such a model in the safety evaluation of geological disposal, it is necessary to understand the binding reaction between the deep-underground NOM and nuclides. We focused on the fact the NOM fluorescence is quenched by binding to metal ions, and conducted quenching experiments, europium was added to the deep-groundwater. Then obtained fluorescence matrix, the fluorescent-component of NOM that contributes to the binding reaction was identified by using Parallel Factor Analysis, and compared with the surface NOM fluorescent-component.