Instrument: Isotope-ratio Mass Spectrometer
The Isotope-ratio Mass Spectrometer is a particular type of mass spectrometer used to measure the relative abundance of isotopes in a given sample (e.g. VG Prism II Isotope Ratio Mass-Spectrometer).
A Europa 20/20 isotope ratio mass spectrometer equipped with an automated nitrogen and carbon analyzer (ANCA) was used in determination of N2 fixation rates. The Europa was originally manufactured by Europa Scientific Inc., Cincinnati OH, USA and was refurbished by PDZ Europa Limited, Elworth, Sandbach, Cheshire, UK.