Published:Journal of Chromatographic Science,
ISSN 0021-9665 Volume
46, Number 4, April 2008, pp. 308-315
Acid Modified Diatomaceous Earth-A Sorbent Material
for Thin Layer Chromatography
Soner Ergül1, and S¸ahin
Savas¸ci2 1Department of Science Education, Faculty of Education,
Ondokuz Mayis University 55200, Atakum Yerleskesi-Samsun, Turkey
and
2Department of Chemistry, Faculty of Science and Literature,
Balikesir University, 10100 Balikesir, Turkey.
Natural diatomaceous earth (DE) is modified by
flux calcination and refluxing with acid. To characterize natural
DE, modified DE’s [flux calcinated (FC)DE and FCDE-I] and
silica gel 60GF254 (Si-60GF254) are analyzed
microscopically, physically, and chemically by various techniques.
FCDE-I and Si-60GF254 are investigated for their usefulness
in the stationary phase of thin layer chromatography (TLC) both
individually and in composition. Sodium diethyldithiocarbamate
(DEDTC) and ammonium pyrrolidinedithiocarbamate (PyDTC) are prepared
as Co or Cu (M) complexes [M(DEDTC)2 and M(PyDTC)2,
respectively]. These complexes and their mixtures are run on
thin layers of Si-60GF254 and FCDE-I
individually, and on various FCDE-I and Si-60GF254 mixtures.
Pure toluene and various toluene–cyclohexane mixtures (3:1,
1:1, 1:2, 1:3, v/v) are used as mobile phases for the running
the complexes. The best analytical separations of both M(DEDTC)2
and M(PyDTC)2 complexes are obtained when using pure
toluene and toluene–cyclohexane (3:1, 1:1, v/v) as mobile
phases on FCDE-I–Si-60GF254 (1:3, 1:1, w/w)
layers as stationary phases. This study shows that it is possible
to qualitatively analyze and to satisfactorily separate a mixture
Cu2+ and Co2+
cations on cited chromatographic systems.
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