Fz. El Aamrani et al., Solvent extraction of copper(II) from chloride media using N-(thiocarbamoyl)benzamidine and N-benzoylthiourea derivatives, ANALYT CHIM, 382(1-2), 1999, pp. 205-213
The distribution of copper(II) be tween aqueous solutions and cumene soluti
ons of N-(thiocarbamoyl)benzamidine, 2a-2c, and N-benzoylthiourea derivativ
es, 3a-3f, from chloride media (1 mol/l NaCl) has been studied in detail. T
he metal extraction was greatly influenced by extractant structure of thiou
rea derivatives. The extractability of Cu(II) with extractants 2a-2c and 3a
-3f followed the order as: 3e>3d similar to 3c similar to 3f>3b>>3a similar
to 2a similar to 2b similar to 2c, respectively. The N-thiocarbamoylbenzam
ide derivatives (2a-2c) are comparatively poor extractants than N-benzoylth
iourea derivatives (3a-3f). The organic reagents 3a-3e were selected for de
tailed further studies owing to their better extraction behavior with coppe
r(II). The extraction equilibria was studied as a function of total copper
concentration, pH of the aqueous phase and total extractant concentration.
It was shown by use of equilibrium modeling computer program LETAGROP-DISTR
that the extraction of Cu(II) could be explained assuming the extraction o
f the species CuL2, where L=3c. The equilibrium constants calculated by thi
s program were also reported. (C) 1999 Elsevier Science B.V. All rights res
erved.