Challenges in measuring nitrogen isotope signatures in inorganic nitrogen forms: An interlaboratory comparison of three common measurement approaches.

Rationale: Stable isotope approaches are increasingly applied to better understand the cycling of inorganic nitrogen (N ) forms, key limiting nutrients in terrestrial and aquatic ecosystems. A systematic comparison of the accuracy and precision of the most commonly used methods to analyze δ N in NO and NH and interlaboratory comparison tests to evaluate the comparability of isotope results between laboratories are, however, still lacking.

Methods: Here, we conducted an interlaboratory comparison involving 10 European laboratories to compare different methods and laboratory performance to measure δ N in NO and NH .

Microbiological and Geochemical Survey of CO-Dominated Mofette and Mineral Waters of the Cheb Basin, Czech Republic.

The Cheb Basin (NW Bohemia, Czech Republic) is a shallow, neogene intracontinental basin. It is a non-volcanic region which features frequent earthquake swarms and large-scale diffuse degassing of mantle-derived CO at the surface that occurs in the form of CO-rich mineral springs and wet and dry mofettes. So far, the influence of CO degassing onto the microbial communities has been studied for soil environments, but not for aquatic systems.

Aerobic biodegradation of trichloroethene without auxiliary substrates.

Trichloroethene (TCE) represents a priority pollutant and is among the most frequently detected contaminants in groundwater. The current bioremediation measures have certain drawbacks like e.g.