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The fundamental aspects of the extraction and stripping of platinum (11) from its chloride solution by Aliquat 336 diluted with toluene have been studied. The extraction and stripping was at 99.5 and 97.6% equilibrium within 30 s and 20 min respectively. The percentage extraction increased slightly with decreasing hydrochloric acid concentration. In 0.1 mol dm-3 hydrochloric acid, 1.0 volume percent Aliquat 336 in toluene could load 9.8 mmol dm-3 of platinum (11). The percentage stripping of platinum (11) from Pt(I1)-load organic solvent increased with increasing sodium bisulphite concentration. The enthalpy changes of extraction and of stripping were 12.8 and 114.9 kJ mol-' respectively. Both of the reactions were endothermic.

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The fundamental aspects of the extraction and stripping of palladium from its chloride solution by LIX 65N diluted with Kermac 470B have been studied. Equilibria of extraction and stripping, temperature effect, the variation of sodium thiosulphate concentration on stripping and rate of extraction and stripping on the system Pd2+‐LIX 65N‐Kermac 470B are reported.The fundamental aspects of the extraction and stripping of palladium from its chloride solution by LIX 65N diluted with Kermac 470B have been studied. Equilibria of extraction and stripping, temperature effect, the variation of sodium thiosulphate concentration on stripping and rate of extraction and stripping on the system Pd2+‐LIX 65N‐Kermac 470B are reported.

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