USGS-GD-Scientific Capabilities - STABLE ISOTOPES HYDROGEN Technique

STABLE ISOTOPES

HYDROGEN

Technique
 
  • Element:
Hydrogen-deltaD (SMOW)
  • Material:
    • water hydrogen
    • hydrous minerals
    • fluid inclusion waters
    • gas (H2S, H2, CH4, natural gas)
    • organic hydrogen
    • climate records (ice, precipitation, snow, chlathrates, hydrates)
  • Form:
extract and process to nitrogen, analyze as H2 on mass spectrometer
  • Precision:
Typically ± 0.5 to 1.0 permil.
  • Applications:
sources, tracers, and reaction pathways, biogeochemistry, precipitation and atmosphere/hydrosphere processes, groundwater movement.
 
  • Instruments:
Finnigan 252, Finnigan 251, VG Optima
  • Speciality Peripherals:
extraction lines, auto trapping/gas separation, multiprep
  • Automation:
Yes - MM multiprep (60/day)
  • Sample Size:
    • minimum: 10 micromole as H2 extracted from sample
    • typical: 20-60 micromole as H2
 

 | Capabilities |
| Geochronology, Geochemistry, and Tracer Studies  |
| Geochemistry, and Tracer Studies  |

 

URL http://geology.cr.usgs.gov/capabilities/gronemtrac/geochem/stablei/hydrogen/tech.html