DIOXIDE CONTAINING ORGANOPHOSPHORUS REAGENTS

The feasibility of using Kelex 100, Cyanex 272, 301 and 302, and D2EHT PA as reagents for the supercritical fluid extraction of toxic heavy m etals is demonstrated. High extraction efficiencies are observed for a range of heavy metals using Cyanex 301 and 302 and D2EHTPA ligands fr om a variety of matrices and from samples of high acidity. Extraction efficiencies increased with increasing pressure. Solubility of a range of complexes was determined and found to vary between 0.15 and 12 g L -1. The extraction of toxic metals from environmental matrices was sho wn to be efficient for a range of metals using the Cyanex 302 ligand. Kelex 100 was found to be very selective far the extraction of Cu2+ us ing supercritical fluid CO(?)2. In many cases the extraction process d id not quantitatively remove the metals, but the extraction profiles w ere demonstrated to be initially rapid followed by a very low level of metal extraction, indicating a limit of the extraction process to lea chable toxic metals.