Thermo Scientific EA IsoLink IRMS System, Operating Manual

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6
Using EA IsoLink IRMS System for CNSOH
Setting Up a HO Method
96 EA IsoLink IRMS System for CNSOH Operating Manual Thermo Scientific
Setting Up a HO Method
This section describes the dual measurement to determine hydrogen and oxygen from a single sample.
It contains the following topics:
• “Procedure Overview” on page 96
• “Dual Measurement” on page 97
• “Creating a New Method for Dual Measurement” on page 97
• “Creating a Sequence for Dual Measurement” on page 104
• “Start Data Acquisition” on page 105
• “Dual Measurement Results” on page 106
Procedure Overview
It is possible to perform dual measurements of hydrogen and oxygen from a single sample with the
system (Thermo Chemical Elemental Analyzer, ConFloIV and IRMS) in less than 7min offering fast
sample throughput and high productivity. The technique is suitable for both solid and liquid samples.
Different autosamplers are used to measure different sample types, see
Table 21 .
For the analysis of two isotopic species (hydrogen and oxygen) from a single sample, a method that
comprises both must be defined. As soon as the hydrogen peak (
3 in Figure 104 ) has been identified,
Isodat Software Suite stops the HD acquisition. The magnet jumps to the CO configuration (defined
in the Switch Gas column in the time events list, see
Figure 106 on page 98 ).
HO
Figure 104. Schematic Chromatogram of a HO Dual Measurement
Table 21. Dual Measurement and Sample Type
Sample Type Autosampler
Solids and viscous liquids (for example, honey,
serum, olive oil) MAS 200, MAS Plus or others
Liquids, for example, water, alcohol, urine AS3000, AS 1310, GC Pal, TriPlus 100 LS.