Complete Analytical Solutions
The conversion of any type of organic or inorganic compound into simple gases is the basic principle for isotope ratio mass spectrometry. A wide range of sample preparation devices and interfaces are available as inlets to the DELTA V series. Thermo Fisher Scientific offers complete analytical solutions with GC, HPLC and elemental analyzers for fully automated isotope ratio analyses on a wide range of samples for practically every application.
Elemental Analyzers
The ConFlo, with an installed base of over 600 units, is the most widely used interface for coupling elemental analyzers with isotope ratio mass spectrometers. The ConFlo III Universal Interface allows the connection of a wide variety of elemental analyzers to the DELTA V including: Dumas combustion elemental analyzers for 13C/12C, 15N/14N and 34S/32S, quantitative high temperature carbon reduction elemental analyzers for D/H and 18O/16O (TC/EA and Flash EA HT), the GC-Box for analysis of components of gas mixtures, as well as custom made peripherals e.g. DOC analyzers, laser ablation devices. The automated dilution system of the ConFlo III together with the 50 Volt amplification range of the DELTA V allows dual element analysis of C and N or H and O with a dynamic range > 1:1000.
Liquid Chromatography
The LC IsoLink opens the world of HPLC separations to 13C/12C isotope ratio applications. Its sensitivity, precision and accuracy enable, for the first time, the compound specific isotope analysis of bioactive compounds with high polarity and high molecular weight. It offers full automation and maintenance-free operation. In addition, the LC IsoLink comes with a fully automated bulk μ-Elemental Analyzer mode for 13C-analysis of DOC, dissolved organic carbon.
Gas Chromatography
The GC-C/TC III with combustion and high temperature pyrolysis is used for compound specific isotope analysis of complex mixtures separated on a capillary GC column. Determination of D/H, 13C/12C, 15N/14N and 18O/16O isotope ratios is possible for all mixtures accessible by the GC technique. More than 600 GC-IRMS systems are installed and being used in a very large range of application. Positive identification of compounds can be achieved by simultaneous determination of isotope ratios and acquisition of full scan EI/CI spectra, with a hybrid GC-MS/IRMS system.
Loop Injection of Gases
The GasBench II is a flexible continuous flow preparation device and inlet system with Repetitive Loop Injection of gases. It has proven its versatility and performance in more than 200 installations. Supported by a robotic autosampler and using septum-sealed sample vials, a wide variety of applications is accessible for high precision on-line measurements. The GasBench II connected to a DELTA V offers precision compareable to dual inlet methods for H2 and CO2 water equilibration, phosphorolysis of carbonates, CO2 from air, and dissolved inorganic carbon but with the enhanced productivity and ease-of-operation of Continuous Flow Isotope Ratio MS.
Trace Gas Analysis
The PreCon trace gas pre-concentrator can be connected to the GC-C/TC III or the GasBench II for atmospheric trace-gas research in the ppm and ppb range.
Dual Inlet Analysis
The Dual Inlet system delivers ultimate precision and accuracy by close comparison of clean sample and reference gases under viscous flow conditions.
The Dual Inlet system uses monolithic, all-metal valve blocks with gold-sealed and gold-seated valves. The changeover valve is mounted directly to the ion source housing, a design with minimal dead volume and minimum gas path length.
The variable bellows can be adjusted between 3 and 40 mL volume. Each bellows has a built-in pressure transducer to enable exact sample-standard pressure balancing to ensure the highest level of performance. The “Fast Bellows” drive allows more rapid adjustment, leading to optimal sample utilization. The waste line is pumped by a built-in turbomolecular pump.
The Dual Inlet system, including the capillaries, has integrated heating in order to minimize memory.
The system can be expanded with a μ-Volume inlet and up to two 10 sample Multiports with optional tube crackers. The Multiport has built in pressure transducers; intelligent software allows extreme flexibility in sample inlet.
Sample preparation systems which can be connected to the Dual Inlet system include the unique Kiel Carbonate IV automated carbonate preparation device, the gold standard for isotope analysis of foraminifera, the H/Device for ultra-high precision chromium reduction of sub-μL water samples, and the automated HDO water equilibration device.
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