M. Wisniewski et al., INTERFACIAL ACTIVITY AND RATE OF PALLADIUM(II) EXTRACTION WITH DECYL PYRIDINE MONOCARBOXYLATES, Journal of chemical technology and biotechnology, 63(3), 1995, pp. 209-214
Decyl isonicotiniate and decyl nicotiniate permit a rapid extraction o
f palladium(II) from its hydrochloride solutions. Decyl picoliniate is
not a suitable extractant. 4-Octylphenylamine can act as a phase tran
sfer catalyst when its concentration in the organic phase is at least
2.5 x 10(-4) M. It seems that the interfacial adsorption of pyridine c
arboxylates and of 4-octylphenylamine is not the decisive phenomenon i
n palladium(II) extraction. The negligible protonation of the pyridine
-type extractants and the phase transfer catalysis explains well the q
uick extraction of palladium(II) with the commercial and highly hydrop
hobic extractant ACORGA CLX-50.