Stable isotopes of carbonates, DIC, air and water

Our work horse is a ThermoFisher Delta V Plus with a Gasbench II which we use primarily for isotope analysis of calcite; we also run aragonite, dolomite, magnesite and siderite samples. The principles of continuous-flow isotope ratio mass spectrometry of carbonates is described in Spötl & Vennemann (RCM 2003, see Group Publications).

We have since optimized the method for high-throughput of carbonate samples and now routinely run ca. 30,000 samples on an annual basis. See this recent article for further details: Spötl (RCM 2011, see Group Publications)

A method for carbon isotope analysis of dissolved inorganic carbon (DIC) in water samples was reported in Spötl (Isotopes in Environmental and Health Studies 2005, see Group Publications)

Samples for carbon isotope analysis of carbon dioxide in cave air are directly taken using Helium-flushed 10 ml exetainer vials. We also sample soil gas using a simple soil probe as described in Spötl (RCM 2004, see Group Publications).

We also use a Picarro L2140-i CRDS instrument for water isotope analysis.
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