Richard S. Dinicola Paul M. Bradley 2005 <p><span>A shallow, RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine)&ndash;contaminated aquifer at Naval Submarine Base Bangor has been characterized as predominantly manganese-reducing, anoxic with local pockets of oxic conditions. The potential contribution of microbial RDX degradation to localized decreases observed in aquifer RDX concentrations was assessed in sediment microcosms amended with [U-</span>¹⁴<span>C] RDX. Greater than 85% mineralization of</span>¹⁴<span>C-RDX to&nbsp;</span>¹⁴<span>CO</span>₂<span>&nbsp;was observed in aquifer sediment microcosms under native, manganese-reducing, anoxic conditions. Significant increases in the mineralization of&nbsp;</span>¹⁴<span>C-RDX to&nbsp;</span>¹⁴<span>CO</span>₂<span>&nbsp;were observed in anoxic microcosms under NO</span>₃<span>-amended or Mn(IV)-amended conditions. No evidence of&nbsp;</span>¹⁴<span>C-RDX biodegradation was observed under oxic conditions. These results indicate that microbial degradation of RDX may contribute to natural attenuation of RDX in manganese-reducing aquifer systems.</span></p> application/pdf 10.1080/10889860590929574 en Taylor & Francis RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine) biodegradation in aquifer sediments under manganese-reducing conditions article