Carrier-mediated transport of some main group metal loris across various organic liquid membranes

Extraction and facilitated transport of Na+, K+, Mg2+, and Ca2+ ions have been studied using TDA-1 as carrier through BLMs using chloroform, dichloroethane and carbon tetrachloride liquid membranes. (See Symbols section for definitions.) Pic(-), Dnp(-), Onp(-), and SCN- have been used as anions. K+ and Ca2+ ions are selectively extracted into organic phase whereas no extraction of Na+ and Mg2+ ions has been observed using single metal ion species. Higher extraction values are observed for Ca2+ ion than for Mg2+ ion, whereas selectivity for K+ ion was retained using coexisting cations in the source phase. Na+ and Ca2+ ions are transported to a greater extent than K+ and Mg2+ ions. Poorer extraction and transport values are observed in carbon tetrachloride than in chloroform and dichloroethane. The ionophore shows higher extraction and transport efficiency for alkaline earth metal ions than for alkali metal ions.