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Deuterium (also referred to as hydrogen-2, symbol D or 2H) is a natural, stable isotope of hydrogen with a nucleus containing one proton and one neutron. δD analysis, also referred to as an isotopic signature, is used in conjunction with δ18O analysis to determine the V-SMOW (Vienna Standard Mean Ocean Water) value of water (H2O) molecules. δD measurements can help inform ecology, hydrology, and paleontology studies.

Variations of δD and δ18O compositions in water are caused by isotope effects in the hydrological cycle due to isotope fractionation at all kind of phase transformation: evaporation, condensation, and others. Basically, the isotope fractionation is dependent of temperature. Therefore, δD and δ18O analysis from groundwater or ice core samples can be used to gain conclusions about the climatic conditions during groundwater recharge. 

Picarro has designed and produced several isotope analyzers that precisely measure δD in water for laboratory and field studies.


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L2130-i Isotope and Gas Concentration Analyzer

High-precision triple oxygen isotope research in water is finally simple and affordable.

L2140-i Isotope and Gas Concentration Analyzer

The Picarro L2140-i isotopic water analyzer enables simultaneous measurements of δ18O, δ17O, δD and determines 17O-excess for paleoclimate, (eco) hydrology, and atmospheric science applications.