The GEO 20-20 series of isotope ratio mass spectrometers have been designed to deliver performances related to the level measurement precision required by different applications.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Mode
D
13C
15N
18O
34S

GEO 20-20

Dual-inlet (1)
0.15(200 Bar µl)
0.01(100 Bar µl)
0.01(100 Bar µl)
0.015(100 Bar µl)
0.015(100 Bar µl)

GEO 20-20

DI + Cold Trap (1)
-

0.01(20 Bar µl)

0.02(3 Bar µl)

0.01(20 Bar µl)

0.015(20 Bar µl)

0.03(3 Bar µl)

0.015(20 Bar µl)

GEO 20-20

DI + Manifold(2)
0.5 (200 Bar µl)
0.02 (100 Bar µl)
-
0.03 (100 Bar µl)
-

GEO 20-20 + CAPS

Acid Carbonate (2)
-
0.03(50µg CaCO3)
-
0.06(50µg CaCO3)
-

GEO 20-20 + WES

Water Equilibration(2)
1.0 (1ml H2O)
-
-
0.05 (1ml H20)
-

The measurement precision obtainable is dependent on the natural abundance of a stable isotope and the way the gas is produced and presented to the analyser. For you to decide on which configuration best suits your needs, the tables above summarise the precision available (‰ vs natural reference) from our analytical systems.

Notes :

1] Internal precisions: 2s10 for 10 changeovers on gases at natural abundance.

2] External precisions: sn-1 for 10 samples.

3] External precisions: sn for 5 samples.

4] Refers to nanograms of element on-column.

General: Unless otherwise stated the gases analysed for each isotope are; Hydrogen (2H), Carbon Dioxide (13C and 18O), Nitrogen (15N) and Sulphur Dioxide (34S). All precisions are quoted for SerCon Standards. Precisions are a guide to expected performance and are often exceeded with good practice.

DI-IRMS - System Performance