• bei uCompound specific isotope analysis of δ¹³C, δ¹⁵N, δ¹⁸O, and δ²H
• All GC-volatile organic compounds
• Analysis into the picomole range
• Highest GC resolution due to true capillary design
• Quantitative high temperature combustion up to 1000 °C
• Quantitative high temperature pyrolysis up to 1500 °C
• Fractionation-free sample transfer
• Highest transfer rate into the IRMS
• Independent reference gas injection

The Thermo Scientific GC-C/TC III interface is a state of the art GC interface for the analysis of ¹³C/¹²C, ¹⁵N/¹⁴N, ¹⁸O/¹⁶O, and D/H. Organic compounds eluting from a GC column are converted into simple gases when traversing a capillary micro-reactor. Accordingly all compound specific isotope ratios can be analyzed in the IRMS.

The first GC combustion system for ¹³C/¹²C (δ¹³C) determination was introduced by Thermo Finnigan in 1988, opening the new field of compound specific isotope analysis (CSIA). This technique combines the exquisite chemical resolution of capillary GC with the high precision of isotope ratio mass spectrometry (IRMS).

The capability for analysis of δ¹⁵N and δ¹⁸O were added in 1992 and1996. δD analyses by quantitative pyrolysis or High Temperature Conversion (GC-TC IRMS) was introduced in 1998, together with the development of the DELTAplusXL, with an energy filter in the m/z 3 collector for the suppression of ⁴He⁺ ions, which otherwise corrupted the HD⁺ signal. The GC-C/TC III incorporates the knowledge and experience that comes with having installed >300 GC combustion and >100 GC pyrolysis interfaces.

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