Effect of Macrocycle Type on the Extraction into Toluene of Ag+, Pb2+, and Cd2+Using a Combination of a Macrocycle and Di(2-ethylhexyl)phosphoric Acid as Extractants

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Abstract
The nitrate salts of Ag+ and Pb2+ are extracted into toluene solutions of one of the following macrocycles: dicyclohexano-18-crown-6 (DC18C6); 1,10-dithia-18-crown-6 (DT18C6); 1,10-diaza-18-crown-6 (2.2); hexathia-18-crown-6 (HT18C6); or cryptand 2.2.1. In addition, the nitrate salt of Cd2+ is extracted into toluene solutions of DC18C6 or DT18C6. Ag+, Pb2+, and Cd2+ are also extracted into toluene containing di(2-ethylhexyl)phosphoric acid (HDEHP) and toluene containing a combination of HDEHP and one of the macrocycles. Metal ion extraction is synergistic for the systems containing HDEHP and DC18C6, 2.2, or 2.2.1, but is antagonistic for the systems containing HDEHP and DT18C6 or HT18C6.