1986 Volume 59 Issue 2 Pages 381-384
The extraction of alkaline earth metal ions has been investigated using a mixture of polyethylene glycol mono-p-nonylphenyl ether (PEGP; average number of oxyethylene group, 10) and 4-(1,1-dimethyl-3,3-dimethylbutyl)-2,5-dinitrophenol (2,5-dinitro-4-t-octylphenol, DNP; HL) in 1,2-dichloroethane. The metal extraction takes place with one molecule of deprotonated DNP (L−) and an extraneous monoanion (X−) for neutralization of the dicationic charge of the metal ion. The ease of extraction generally follows the order, Ba2+>Sr2+>Ca2+>>Mg2+. The nature of the anion present in the aqueous phase strongly affects the extractability. For barium, the extractability decreases in the order ClO4−>SCN−>I−>Cl−>NO3−. The composition of the extracted complexes for barium and strontium ions proportional to the metal is metal : PEGP : L− : X−=1 : 1 : 1 : 1. The overall extraction constants were estimated.
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