Pb(II) Extraction with Benzo-18-Crown-6 Ether into Benzene under the Co-Presence of Cd(II) Nitrate in Water

Abstract

]) were obtained. Using these constants, the Pb(II) extraction with B18C6 under the co-presence of Cd(II) in the water phase was characterized. In such a characterization, I and I Bz dependences on the constants were mainly discussed, where their symbols denote the ionic strength of the water phase and that of the Bz one, respectively.

Chelating Extractants for Metals

“…The extraction of lead (II) and cadmium (II) from nitric acid solutions with benzo-18-crown-6 ether 60 in benzene was studied [80]. The extraction properties of compound 60 were evaluated by determining the extraction constants of these metals.…”

CdI<sub>2</sub> Extraction with 18-Crown-6 Ether into Various Diluents: Classification of Extracted Cd(II) Complex Ions Based on the HSAB Principle

“…This order is basically different from that [3] Table 1 and Table 2 were used for the calculations. From the three equations, we can calculate relative concentrations (or molar fractions), such as f 0 /% = 100D 0 /D t and f + = 100D + /D t with D t = D 0 + D + + D 2+ [5]. The mean values of f 0 , f + , and f 2+ were listed in Table A1 of the Appendix, where the symbols f 0 , f + , and f 2+ (=100D 2+ /D t ) denote the relative concentrations of CdLI 2 , CdLI + , and CdL 2+ , respectively.…”

“…It is well known that crown ethers (L) extract Cd(II) and Pb(II) salts, such as metal picrates (MPic 2 ) [1] [2] [3] [4] [5], the former chloride [6], and bromides [1] [6], into various diluents. Similar extraction behaviors into benzene (Bz) and nitrobenzene (NB) have been reported for Ca(II), Sr(II), and Ba(II) picrates with L [7] [8].…”

“…( ) and K 2,org = K ex /K ex± [4] [5] (see the Section 2.4). Using these evaluated K 1,org and K 2,org values, reaction properties of CdLA + and CdL 2+ with mainly A − = I − , Br − , and Cl − in the org or diluent phases were also classified based on the HSAB principle [9] [10] [11].…”

“…[5] at 298 K. Here, K ex , K ex± , K D,I , and K Cd/CdL were defined as [CdLI 2 ] org /P, [CdLI + ] org [I − ] org /P with P = [Cd 2+ ][L] org [I − ] 2 , [I − ] org /[I − ], and [CdL 2+ ] org /[Cd 2+ ][L] org…”