Solvent Extraction of the Nitrate Salts of K+, Ag+TI+and Pb2+Using Di(2-Ethylhexyl) phosphoric Acid and Dicyclohexano-18-Crown-6 in Toluene

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Abstract
A solvent extraction system is used to determine metal distribution coefficient, D n+, values between water and toluene for the nitrate salts of K+M, Ag+, T1+, and Pb2+ using, both individually and together, the organic soluble complexing agents HDEHP and DC18C6 (Figure 1). Synergistic solvent extraction effects.are found for all of the metals examined. The extraction of Pb2+ is much greater than that of the monovalent cations. The extraction of K+ increases either as the equilibration temperature decreases or as the equilibrated aqueous pH increases. The extraction of Ag+ increases in a regular fashion until the initial concentration of DC18C6 in the toluene reaches the initial concentration of HDEHP+in the toluene. Beyond this point, no appreciable increase in Ag+ extraction is observed with increased initial DC18C6 concentration.

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