The laboratory is equipped by mass spectrometers Finnigan Mat 251 (vintage 1982), Geo 20-20 (vintage 1997) and recently Delta V (2012), with a possibility of measuring of isotope ratios both in the classical dual regimen (i.e. by comparison of isotope composition in the researched sample and in the standard, “dual mode IRMS”), and in the continues flow (mass spectrometer connected “on line” on element´s analyzer Fison 1108; this set up enables a quick combustion, chromatographic separation of produced gases, their input in the mass spectrometer with a help of open split ConFlo, hydrocarbons separated on gas chromatography can be measured by “flash combustion-GC-IRMS”. New laser analyzer (LGR) was installed for D/H and 18O/16O analyzes of water samples.
The standard methods include analyses 13C and 18O in carbonates, 2H and 18O in waters, 13C in organic materials of all kinds (solid, liquid and gaseous, at gaseous mixtures with a possibility of chromatographic separation of components), 15N in organic materials and also in diluted components (NH4+, NO3-), 18O in sulphates, and 34S in sulfides and sulphates. Analyses of 18O in the quartz, silicates or silicate rocks is enabled by the cooperation with the Faculty of Natural Sciences of Charles University in Prague, when fluoration decomposition of samples is going on in workplace of the Faculty and measurements in the Department of stable isotopes of the Czech geological Service.
Inter-laboratories comparative tests
Regarding that the classical analyses of ratios of stable isotopes are based on comparison of isotope ratio in the researched sample with a known isotope ratio in an international standard, the calibration and distribution of these standards has in the geochemistry of stable isotopes quite extraordinary significancy. The Department of stable isotopes of the CGS a number of time participated on calibration of new international standards in the past. In the last date it was the calibration of new international standards for measurement of isotope composition of sulphur IAEA-S-1, IAEA-S-2 and IAEA-S-3 organized by the International Agency for Atomic Energy in Wienna (1998), and calibration of gaseous standards IMEP-8A and IMEP-8B organized by the Institute for Reference Materials and Measurement in the Geel (Joint Research Centre of the European Commission) in the year 1999. Results of the laboratory were in all cases, in the range of denoted indicated error of measurements, identical with a subsequently accepted recommended value.