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Data was acquired from an isotope ratio mass spectrometer using Isodat 3.0 software. 15N2 was added to helium flushed exetainers containing 10 nmol tank N2O.<\/p>\n
Direct Nitrous Oxide Calculations:<\/strong> moles 15N15N16O added equation: \"delta value tracer\" is the expected 46\/44 delta value of added N2O (\u2030) assuming it has the same enrichment as that reported for the tracer gas, at 98 atom %: Refer to the following publication for more information:<\/strong> Summary of methods from Dabundo et al. 2014:<\/strong> Preparation of nitrate & ammonium solutions:<\/em> Initial experiments consisted of 40 mL or 100 mL solutions of 10, 50, 100, 200, or 300 umol\/L nitrate and 5 umol\/L ammonium chloride in 60 mL or 120 mL serum vials that were sealed with stoppers. The 20 mL of air headspace in each of the treatment vials was supplemented with 0.1 mL of 15N2 gas from respective bottles from each of the three suppliers. The solutions were equilibrated overnight on a shaker, after which the 15N\/14N and 18O\/16O isotope ratios of nitrate were analyzed. The 15N\/14N isotope ratio of ammonium was also analyzed in experimental solutions treated with the Sigma-Aldrich and Cambridge Isotopes stocks.<\/p>\n Additional experiments were carried out in which 2 mL 15N2 gas was equilibrated overnight in 20 mL serum vials containing 10 mL solutions of 10 umol\/L sodium nitrate, after which the 15N\/14N and 18O\/16O ratios of nitrate were measured. Similarly, 10 mL solutions of 5 umol\/L ammonium chloride were dispensed in 20 mL serum vials and equilibrated overnight with 2 mL 15N2 gas, after which the 15N\/14N isotope ratios of ammonium were analyzed.<\/p>\n The measured 18O\/16O ratios of nitrate\/nitrite in solutions equilibrated with 15N2 gas from some stocks suggested the presence of 46-N2O contamination. As the analyte for isotope ratio analysis is N2O, and 46-N2O can be explained by both 15N15N16O and 14N14N18O, N2O that is doubly labeled with 15N is falsely detected as d18ONO3 enrichment. The presence of 46-N2O contamination in 15N2 gas was verified directly for one of the Sigma-Aldrich stocks (Lot # SZ1670V) by adding 0.0125, 0.020, or 0.025 mL of 15N2 stock to 20 mL serum vials containing 10 nmoles of reference N2O in helium. The N and O isotopic composition of the N2O was analyzed as described below, and compared to unamended N2O injections.<\/p>\n Nitrate N and O isotope ratio analyses:<\/em> The 15N\/14N reference is N2 in air, and the 18O\/16O reference is Vienna Standard Mean Ocean water (V-SMOW). Individual analyses on the GC-IRMS were referenced to injections of N2O from a pure N2O gas cylinder, and then standardized through comparison to the international nitrate standards USGS-34, USGS-32, and IAEA-NO-3, using standard bracketing techniques. Nitrate samples from experiments with Campro Scientific 15N2 were standardized with USGS-32 and IAEA-NO-3, and an additional internal lab nitrate standard (UBN-1).<\/p>\n Nitrous oxide N and O isotope ratio analyses:<\/em> Headspace N2 isotope ratio analyses:<\/em> Direct measurments of N2O from experiments on 15N-labeled contaminants in commercial 15N2 gas; data used in Dabundo et al. 2014.<\/p>\n Refer to the following publication for more information: See related datasets: Since 46\/44 enrichment is a function of 15N15N16O contamination rather than delta 18O enrichment of nitrate, as the delta 15N correction scheme presumes, uncorr delta 46\/44 was replaced with the average control delta 46\/44 value to calculate delta 15N.<\/p>\n Samples with the same ID are replicated measurements.<\/p>\n BCO-DMO Edits:
\ndelta values calculated by the same method as nitrate ( delta 15N NO3 and apparent delta 18O were calculated from uncorr_d45_44 and uncorr_d46_44 using equations outlined in the \"Nitrate isotope corrections\" supplementary file<\/a> (PDF), followed by reference to IAEA N-3, US34, US32, and\/or UBN-1 standards.)<\/p>\n
\n\u00a0\u00a0\u00a0\u00a0\u00a0 moles added = [(46\/44 sample)*(N2O final) - (46\/44 control)*(N2O initial)]\/(d value tracer)<\/p>\n
\n15N2 injected (moles) is calculated from the injection volume using the ideal gas law at T = 25 degrees C and P = 1 atm.<\/p>\n
\nDabundo, R., Lehmann, M.F., Treibergs, L., Tobias, C.R., Altabet, M.A., Moisander, P.H., and Granger, J. 2014. The Contamination of Commercial 15N2 Gas Stocks with 15N\u2013Labeled Nitrate and Ammonium and Consequences for Nitrogen Fixation Measurements. PLoS ONE, 9(10): e110335. doi:10.1371\/journal.pone.0110335<\/a><\/p>\n
Reagents:<\/em>
\nFour lecture bottles of 98+ at% 15N-labeled N2 gas were purchased from Sigma-Aldrich, three from lot # SZ1670V, and one from lot # MBBB0968V. Two 1L lecture bottles of 98+ at% 15N2 were purchased from Cambridge Isotopes from lot #\u2019s I1-11785A and I-16727. One 1L lecture bottle of 98+ at% 15N2 was purchased from Campro Scientific from lot # EB1169V. Ammonium and nitrate solutions were prepared with salts or with solutions obtained from different distributors: sodium nitrate (NaNO3), potassium nitrate (KNO3), and ammonium chloride (NH4Cl) from Fisher Scientific; analytical-grade potassium nitrate from Fluka Analytical and a gravimetric solution of ammonium chloride from SPEX CertiPrep.<\/p>\n
\nAqueous solutions of natural abundance (unlabeled) ammonium and nitrate salts were equilibrated overnight with an air headspace supplemented with an injection of 15N2 gas (to determine whether the 15N2 gas stocks contained 15N-labeled ammonia (NH3) or nitrate and\/or nitrite (NOx) contaminants). After equilibration, the 15N\/14N ratio of ammonium and the 15N\/14N and 18O\/16O ratios of nitrate\/nitrite in solution were measured, as well as the 15N\/14N ratio of N2 gas in the headspace. The isotope ratios of nitrate and ammonium were compared to those in control solutions, which were not supplemented with 15N2 gas. Experiments with the Campro Scientific 15N2 stock were verified for 15N-nitrate\/nitrite contaminants only (and not for 15N-ammonium).<\/p>\n
\nNitrate\/nitrite nitrogen (15N\/14N) and oxygen (18O\/16O) isotope ratios were measured using the denitrifier method. Nitrate (and nitrite) in experimental samples was converted stoichiometrically to nitrous oxide (N2O) by a denitrifying bacterial strain (Pseudomonas chlororaphis f. sp. aureofaciens, ATCC 13985) that lacks nitrous oxide reductase. The N and O isotopic composition of N2O was then measured on a Delta V Advantage Isotope Ratio Mass Spectrometer (IRMS) interfaced with a modified Gas Bench II gas chromatograph (Thermo Fisher) purge and trap system. The isotope ratio measurements are reported in per mille (o\/oo) units.<\/p>\n
\nN2O isotope ratios were measured directly on the GC-IRMS, and referenced against the N2O tank, which was standardized indirectly by comparison to the d15N and d18O of nitrate standards.<\/p>\n
\nTo measure the d15N of N2 gas in the headspace of experimental samples, 75 uL of headspace was injected into 12 mL Exetainer vials previously flushed with helium, then analyzed on a Gas Bench II GC-IRMS (Delta V Advantage Plus) operated in continuous flow mode. N2 and (O2+ Ar) were separated on a gas chromatography column. The analyses were standardized with parallel analyses of ambient N2 gas in air. These direct N2 gas measurements were carried out for experiments conducted using two of three lecture bottles from Sigma-Aldrich lot, and for experiments conducted using the lecture bottle from Cambridge Isotopes. The 15N2 concentration in the headspace of other experiments was estimated from the tracer injection volume rather than from direct measurements.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/ocean-data.org\/schema\/hasBriefDescription":[{"@value":"46-N2O contamination measured directly in commercial 15N2 gas.","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/description":[{"@value":"
\nDabundo, R., Lehmann, M.F., Treibergs, L., Tobias, C.R., Altabet, M.A., Moisander, P.H., and Granger, J. 2014. The Contamination of Commercial 15N2 Gas Stocks with 15N\u2013Labeled Nitrate and Ammonium and Consequences for Nitrogen Fixation Measurements. PLoS ONE, 9(10): e110335. doi:10.1371\/journal.pone.0110335<\/a><\/p>\n
delta 15N NO3<\/a>
delta 15N NH4<\/a>
N2<\/a>
particulate N<\/a><\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/www.w3.org\/2000\/01\/rdf-schema#label":[{"@value":"direct N2O","@type":"xsd:string"}],"http:\/\/ocean-data.org\/schema\/hasProcessingDescription":[{"@value":"
\n- Modified parameter names to conform with BCO-DMO naming conventions;
\n- Denoted 'Control' and 'Standard' in the lot_number column;
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(2014) Results from experiment examining 15N-labeled contaminants in commercial 15N2 gas: 46-N2O contamination measured directly in commercial 15N2 gas (15N2 Contamination project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). 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