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Laser Ablation (Femtosecond) Combustion Gas Chromatography - High Resolution – Isotope Ratio Mass Spectrometry (LA-CGC-HR-IRMS)


Laser Ablation (Femtosecond) Combustion Gas Chromatography - High Resolution – Isotope Ratio Mass Spectrometry (LA-CGC-HR-IRMS)

Make: Thermo Fisher Scientific
Model: 253 Plus

It helps in the analysis of stable isotopes (H, N, C, O, S, etc.) which permit the tracking of the physical, chemical and biological reaction and sources materials at a wide variety of spatial scales. It will be utilized for measuring:-

  • C, O and S stable isotope ratio from a variety of materials and rocks to study the mantle petrogenesis, magmatic, metasomatic and hydrothermal origin and their crystallization evolution in the earth. Sulfur and oxygen stable isotope ratio are used to study the origin of ore minerals and metallogeny.
  • H and O stable isotope ratios to study the climate change and precipitation in the Indian subcontinent.  These are also used in hydrogeology as a good tracer for their origin.
  • Authentication of organic food products. 

Required Samples :-

Sample introduction methods

Samples are introduced to the ion source as pure gas (dual inlet) or carried on a flow of helium carrier gas (continuous flow). A range of preparation systems are available to convert solid, liquid and gas samples containing stable isotopes into a gas that can be analyzed, while preserving the isotopic signature of the original sample with high precision and accuracy.

Guidelines for Sample preparation

Solid sample for determining the stable isotopic composition analysis must be free from contamination and homogeneously powdered.

Homogeneity- sample particle size, texture and purity.

Weight- Sample weight anywhere from 10-70 mg.

Liquid Sample- Liquid samples vials must be sealed and filled completely to avoid possible isotopic fractionation due to evaporation processes. Low pH (acidic) water samples should be reported.

  • Separate samples should be sent for different analysis.

  • Sample details (eg. Location, depth, TOC values etc.,) should be provided in the application.

  • Data generated will be provided on CD (Compact Disc) or DVD (Digital Versatile Disc) only.

  • Explosive, poisonous or any hazardous sample giving rise to toxic gases/fumes cannot be undertaken for analysis.

**Please make available the analysis related publications to expedite the sample preparation related protocols.


Form Application :-

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User Charges :-

  User Charges
Services Description / Analysis Type / Description Technology RUN TIME BHU & Start-Ups Other Academic Institution, R&D Labs, MSMEs Large Industrial Establishment

Gas bench (for water)
§18 O ( in water)

500 1000 2000

Gas bench (for water)
§2 D ( in water )

500 1000 2000
Element Analyzer – FLASH –IRMS (for solid organic and inorganic samples only)
§13C
1000 2000 4000
Element Analyzer – FLASH –IRMS (for solid organic and inorganic samples only)
§15N
1000 2000 4000

Gas bench (for carbonates)
§13 C + §18 O ( in carbonates)

1000 2000 4000

Gas bench (for carbonates)
§13 C (Dissolved inorganic carbon- DIC)

800 1600 3200
Note :- 18% GST is applicable with user charges.

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