[en] Mercury is used as a catalyst for aluminum fuel dissolutions and is therefore present in much of the acidic nuclear waste generated at ICPP. Actinide partitioning from ICPP wastes with the extractant dihexyl-N,N- diethylcarbamylmethylenephosphonate (DHDECMP) is promising; however, mercury is also extracted but not removed by subsequent steps in the proposed flowsheet. Parameters affecting the extraction of mercury, such as temperature, contact time, and concentrations of acid, nitrate, and (DHDECMP) were investigated. The effect of mercury loading in the extractant on actinide extraction and stripping was studied. Methods were evaluated for mercury removal from DHDECMP; these include direct electrolysis, electrolytic replacement by metals and stripping with aqueous media containing complexants or reductants. Mercury removal by complexation using a solvent wash of sodium carbonate-sodium cyanide is the method most easily adapted to our present flowsheet