Rusdiarso B, Messaoudi A, Brunette J P
Laboratoire de Chimie Minerale et Analytique, E.H.I.C.S., C.N.R.S. URA 405, 1 Rue Blaise Pascal, 67008 Strasbourg Cedex, France.
Talanta. 1993 Jun;40(6):805-9. doi: 10.1016/0039-9140(93)80034-o.
The synergistic extraction of cobalt(II) from aqueous solutions loaded with cesium chloride or nitrate, with mixtures of 1-phenyl-3-methyl-4-acyl-pyrazol-5-ols (HL) [acyl = benzoyl (HPMBP), para-tert.-butyl-benzoyl (HPMB'P), stearoyl (HPMSP)] and crown ethers E = B15C5, 18C6, DC18C6, DB18C6 and DB24C8 (DC = dicyclohexano, B = benzo, DB = dibenzo), in CHCl(3), CH(2)Cl(2) and ClCH(2)CH(2)Cl, has been studied. The experimental data agree with the extracted species E(2)CsCoL(3) (E = B15C5), ECsCoL(3), (E = DB18C6) and CoL(2)E (E = DB24C8). The extraction yields follow the orders: 18C6 DC18C6 > DB18C6 > B15C5 > DB24C8, HPMBP > HPMB'P > HPMSP, and ClCH(2)CH(2)Cl > CH(2)Cl(2) > CHCl(3). In spite of the better complexation of potassium than cesium with "18C6" type crown ethers, the extraction of ECsCo (PMBP)(3) is generally higher than the EKCo(PMBP)(3) one. Except in the case of DB24C8, loading the aqueous phase with Cs(+), K(+), Sr(2+) or Ba(2+) improves the synergistic extraction of cobalt.
研究了用1-苯基-3-甲基-4-酰基-吡唑-5-醇（HL）[酰基=苯甲酰基（HPMBP）、对叔丁基苯甲酰基（HPMB'P）、硬脂酰基（HPMSP）]与冠醚E = B15C5、18C6、DC18C6、DB18C6和DB24C8（DC =二环己基，B =苯并，DB =二苯并）的混合物，从负载有氯化铯或硝酸铯的水溶液中协同萃取钴（II），萃取剂为CHCl₃、CH₂Cl₂和ClCH₂CH₂Cl。实验数据与萃合物E₂CsCoL₃（E = B15C5）、ECsCoL₃（E = DB18C6）和CoL₂E（E = DB24C8）相符。萃取率遵循以下顺序：18C6＞DC18C6＞DB18C6＞B15C5＞DB24C8，HPMBP＞HPMB'P＞HPMSP，以及ClCH₂CH₂Cl＞CH₂Cl₂＞CHCl₃。尽管钾与“18C6”型冠醚的络合作用比铯好，但ECsCo(PMBP)₃的萃取率通常高于EKCo(PMBP)₃。除了DB24C8的情况外，在水相中加入Cs⁺、K⁺、Sr²⁺或Ba²⁺可提高钴的协同萃取率。
