Дальневосточный геологический институт ДВО РАН

Laboratory of Stable Isotopes

Head of the Laboratory, Dr. Tatyana A. VELIVETSKAYA

Tel. +7-(423)-231-85-37

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The lab is equipped with a Thermo Fisher MAT 253 Stable Isotope Ratio Mass Spectrometer, which is designed for the high-precision analysis of three isotopes of oxygen (16O,17O,18O). This instrument is coupled with a laser fluorination system for the analysis of oxygen isotope ratios (17O/16O and 18O/16O) in silicates and oxides, which are useful in studies focusing on identification of different classes of meteorites.

The laboratory is one of a few laboratories in Russia that possesses advanced opportunities in research of the light elements stable isotope composition. The laboratory has a number of its own unique techniques, in particular, the only operational facility for determining the stable isotope ratios ¹⁸O/¹⁶O and ¹⁷O/¹⁶O in silicates and oxides from the Earth samples and meteorites. Similar isotope study of oxygen can be carried out by only a few scientific laboratories in the world.

For the first time in the worlds practice this laboratory has developed a methodology allowing to perform a local isotopic analysis of sulfur using mass-spectrometric method with fs laser ablation. A new laser ablation method has been developed for measurements of multiple sulfur isotopes (³²S, ³³S, ³⁴S and ³⁶S) in sulfides using a femtosecond laser ablation system in combination with a reactor for sulfide aerosol conversion into SF₆ gas, a cryogenic and chromatographic purification system, and an isotope ratio mass spectrometer (FsLA-GC-IRMS). For the routine analysis of sulfide, a precision of 0.1 – 0.2‰ (1σ) for δ³⁴S and higher than 0.03‰ (1 σ) for ∆³³S values has been obtained with an ablation crater size of 80 µm diameter and 40 µm depth.

Thermo Fisher Mass spectrometer МАТ 253 should be also outlined from among the equipment of the laboratory that is used for measuring H/D, 13C/12C, 15N/14N, 18O/16O (from СO2 and O2), 34S/32S (from SO2 and SF6) isotopic ratios. Detection H/D could be performed in a helium stream.

Mass-spectrometer Thermo Finnigan МАТ 253 should be also outlined from among the equipment of the laboratory that is used for measuring H/D, ¹³C/¹²C, ¹⁵N/¹⁴N, ¹⁸O/¹⁶O (from СO₂and O₂), ³⁴S/³²S (from SO₂and SF₆) isotopic ratios. Detection H/D could be performed in a helium stream.

The FsLA-CG-IRMS technique used for in situ analysis of multiple sulfur isotopes in sulfides.

Light microscopic image showing the ablation craters in individual grains of NBS-123 sphalerite for in situ sulfur isotope analysis using the FsLA-GC-IRMS technique.

In general the laboratory facilities can be involved in various areas of scientific research, including geology (ore deposits genesis, investigating the origin of ore matter and determining physicochemical conditions of its formation), cosmochemistry (formation and evolution of extra-solar matter), biology (food chains and levels issues, physiologic processes mechanisms), ecology (research and forecasting of environmental changes caused by natural processes as well as anthropogenic actions), paleoclimatology (reconstruction of the environmental conditions in the past), expert examination and diagnostic tests (identifying sources for production of alcohol drinks, juices, honey etc.; identifying natural and cultivated ginseng).