Laboratories

The laboratory for light stable isotopes of the hydrogeology group is specialized in measurements of the liquid phase. It is equipped for measurements of stable isotope ratios of dissolved inorganic carbon (DIC), dissolved organic carbon (DOC) and particulate organic carbon (POC), and oxygen and hydrogen of water. A modified Gasbench system allows for the measurement of the oxygen isotope ratio of the dissolved oxygen (O₂, DO) in water. Additionally, carbon and oxygen isotope analysis of organic material can be carried out. Routine analyses in major ions and trace elements as well as field sampling are also performed.

δ²H and δ¹⁸O water (Picarro, Gasbench, and TC/EA liquid injection)
δ¹³C-DIC and δ¹³C-DOC (Gasbench and Aurora 1030W)
δ¹⁵N and δ¹³C-organic (bulk; Costech Elemental Analyzer)
δ¹⁸O-solids (TC/EA with zero blank autosampler)
gaseous CO₂ samples (Dual Inlet, Gasbench and Delta Ray)
δ¹⁸O on dissolved oxygen (O₂, DO) (via modified Gasbench)
δ¹³C and δ¹⁸O of CO2 (DeltaRay Laser Spectrometer)
major ion analyses
trace element analyses
field parameters (pH, eH, O2, alkalinity, temp., conductivity

Picarro L2140-i – water isotope analyzer for δ¹⁸O, δ¹⁷O and dD

The Picarro L2140-i is a laser spectroscope designed to determine water isotopes. It can measure δ¹⁸O and δD simultaneously. Additionally, the Picarro L2140-i can determine δ¹⁷O excess. It is a laser spectroscope designed for determining water isotopes. It allows the simultaneous measurement of δ¹⁸O and dD. It can also determine δ¹⁷O excess.

Picarro G2201-i Isotopen- and Gaskonzentrationsanalyzer for stable isotope and isotope measurements of CO₂ and CH₄

The Picarro G2201-i laser spectroscope is used to determine the concentration of carbon dioxide (CO₂) and methane in gas samples, as well as the δ¹³C value of carbon isotopes. CO₂ and methane are both measured simultaneously.

Portable Li-Cor Li-7825 Trace Gas Analyzer for CO₂, concentration and isotopes and NH₃ concentration measurements

The Li-Cor Li-7825 is a portable, battery-powered, suitcase-sized laser spectroscope used to determine the concentration of carbon dioxide (CO₂) in the air and its carbon isotope ratio (δ¹³C). It can also perform quantitative analysis of NH₃. Offering a high degree of flexibility, the Li-Cor Li-7825 can be used both in the field and in anthropogenic areas.