Characteristics of Dissolved Organic Matter in Uranium Hosting Aquifers and Potential Molecular Transformation during Neutral In-situ Leaching

Physiochemical parameters, optical parameters, and molecular characteristics of DOM in U production wells (M1 and M2), monitoring wells (BM) and rock extracts derived from EEM, PARAFAC, and FT-ICR MS analysis. The average values of indices based on FT-ICR MS data here are all calculated as intensity-weighted average (e.g., H/Cwa, O/Cwa, DBEwa, NOSCwa, and (AImod)wa). The proportion of organic matter components is based on the relative abundance of molecular formulas.