Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
The Solvent Extraction of Alkaline Earth Metal Ions with Nonionic Surfactants
Yukio SakaiHiroshi NakamuraMakoto TakagiKeihei Ueno
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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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