The extraction Of Cu2+, Pb2+, Cd2+ and Zn2+ utilising supercritical fluid carbon dioxide containing dissolved organophosphorus reagents is shown to be feasible. Using the solubility parameter concept and investigation of a variety of physical parameters favourable extraction conditions of 60 degreesC and 400 atm pressure were determined. Cyanex 302 was found to be the most favourable ligand in terms of stability and ability to complex a range of metal ions. A soil containing substantial amounts of Pb2+ and Cd2+ was studied using SFE and the technique was found to reduce the levels of leachable metal ions to near US EPA regulatory levels.