3:15 PM - 3:30 PM
[1C09] Evaluation of the interaction between deep groundwater natural organic matter and metal ions using fluorescence spectroscopy and multivariate analysis and arrangement of their origins
Keywords:Geological disposal, Natural Organic Matter(NOM), Fluorescence spectroscopy, PARAFAC, Quenching
In HLW disposal, NOM plays an important role by binding radionuclides and changing their environmental behaviors. For surface NOM, mechanistic models that can describe the binding with metal ions under various conditions have been proposed. To use such models in the safety assessment of HLW geological disposal, binding reactions between NOM in deep underground and radionuclides must be evaluated and compared with that of surface NOM . In the previous conference, we reported europium (Eu3+) binding to different components of sedimentary groundwater NOM by means of quenching of NOM fluorescence by bound Eu3+and PARAFAC, a multivariate analysis method. In this presentation, we will present the more comprehensive evaluation by adding new samples including the ones taken at a different depth and discuss the different reactivity of NOM components in terms of their genesis and changes of environmental conditions.