The Isotope Ratio Mass Spectrometer in the Stable Isotope Laboratory of PPOD, Bangalore is of the make SerCon Ltd., U.K. and model GEO 20-20.
This instrument consists of (1) an Inlet System, which is of two types Dual-Inlet and Continuous
Flow,
(2) an Ion Source, which is an electron impact ion production system using a W filament,
(3) a Mass Analyzer which uses a Magnetic Sector for mass separation and (4) a Collector Array with a triple Faraday cup assembly.
The instrument is attached online with four different peripheral systems for sample preparation and handling viz.,
- CAPS – Carbonate Automated Preparation System
- WES – Water Equilibration System
- ANCA-GSL – Automated Nitrogen Carbon Analysis for Gases, Solids and
Liquids
- WECS – Water Equilibration and Carbonate-Acid reaction System.
The entire system along with its peripherals is kept evacuated using pumping system consisting of several Rotary and Turbo Molecular Pumps.
Standard Operating Procedure
Capabilities:
Separation of pure fractions of carbonates and sulphides from rock/fossil/ore fragments through magnetic/ isodynamic separator and hand picking under binocular microscopes.
Determination of "Clttc and "O/tuO isotope ratios of carbonates from carbonatites, sedimentary carbonates, and calcareous fossils for paleoclimatic and paleogeographical
interpretation and sou rce characte ristics of ca rbon ( mantle/sed i menta ry/ biogen ic)
Determination of 'oS/"S isotope ratios of sulphide and barium sulphate for volcanogenic,
hydrothermal or biogenic modelling of ore deposits
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Existing Locations:
NCEGR Bengaluru
Additional Director General
National Mission Head-IV
Central Headquater
Geological Survey of India
15 A & B Kyd Street
Kolkata-700016
Fax- 033-22861716
Email- hodm4@gsi.gov.in
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