laboratory is capable to analyse the following types of materials.
This description contains some observations that might be useful to
the reader interested in the stable isotope preparation techniques.
Water. Hydrogen and oxygen isotope compositions are measured using
automatic on-line gas-H2O equilibration devices
(Roether 1970) in case of brines. Waters with low salt content are analysed using laser spectroscopes.
Carbonate. δ13C and
δ18O values are determined in
calcite, dolomite, ankerite, siderite and magnesite using the
traditional off-line (with the delta S) or automated on-line (delta
plus XP) H3PO4-carbonate reaction.
Fluid inclusions. Inclusion fluids are analysed by thermal
decrepitation or - in case of H-bearing contaminant - vacuum crushing, followed by analyses using a laser spectroscope.
Automated analyses of organic matter and hydrous minerals. Stable H-C-N-O isotope analyses of organic (e.g, cellulose) samples
by means of TC/EA and elemental analyzers. An on-line water vapor equilibration unit is used to correct for exchangable
hydrogen content. The TC/EA unit is also used for H isotope analyses of H-bearing minerals (like biotite or amphibole).
CO2 in air. CO2 is usually analysed
for 13C/12C and 18O/16O
ratios by freezing at liquid nitrogen temperature. However, N2O
- with the same molecule mass - is frozen together with CO2
and hence a correction factor is applied. Another method involves
separation of CO2 and N2O by gas chromatography
and analysing the CO2 separately. Since one of our projects
dealt with polluted urban air that may contain anthropogenic N2O
from different sources, the gas chromatographic separation is chosen.
Isotope geochemistry (Attila Demény)
isotope geochemistry of the upper mantle (Canary Islands, Pannonian
isotope geochemistry of mass extinction events (joint project with József Pálfy)
Isotope hydrology (István Fórizs)
protection of water resources
secular variation of River Danube
cave dripping water, and thermal waters
External collaboratory partner: Maryam Zahra
(e-mail address: email@example.com; phone number +36-30-390 71 53)
CO2 in air (Attila Demény). 1998-1999: Academy
Research Project; 2000-2003: joint NWO-OTKA project with the Hungarian
Meteorological Service (László Haszpra) and the University of
Stable isotope geochemistry of speleothemes (Attila
Czuppon), freshwater limestones
methods of stable isotope geochemistry are also applied in soil
geochemistry studies (Bernadett Bajnóczi).
GEOCHEMISTRY & PALEOCLIMATE Research Group
has been established to coordinate research activities within the
Institute for Geochemical Research related to paleoclimatology.