Instrument: Gas Chromatograph
Instrument separating gases, volatile substances, or substances dissolved in a volatile solvent by transporting an inert gas through a column packed with a sorbent to a detector for assay. (from SeaDataNet, BODC)
NO3- δ15N and δ18O were determined with the denitrifier method (Sigman et al. 2001; Casciotti et al. 2002), wherein denitrifying bacteria lacking terminal nitrous oxide reductase (P. chlororaphis f. sp. aureofaciens ATCC 1398) quantitatively convert sample NO3- to N2O gas, which is then extracted, purified and analyzed through a modified Thermo-Scientific Gas Bench II and Delta V Advantage gas chromatograph isotope ratio mass spectrometer.