IAEA-NO3 and USGS-34 reference solutions were supplemented with 18O-labeled water and analyzed for N and O isotope ratios.
Sampling and analytical procedures:
Effects of sample volume and salinity on O atom exchange with water
NO3- reference materials (IAEA-NO3 and USGS-34) were diluted with mixtures of DIW and NO3--deplete Sargasso ranging in salinity from 0 to 35 ppt to achieve NO3- concentrations of 1, 3, 5 and 20 µmol L-1 – corresponding to respective injection volumes of 10, 3.3, 2 and 0.5 mL – in order to attain 10 nmoles of N analyte. Reference materials at corresponding salinity and NO3- concentrations were supplemented with 18O-labled water, resulting in δ18OH2O values ranging from -6.8 to 335‰ vs. VSMOW.
Zhou, M., Granger, J., Chang, B. X. (2022) Analyses of nitrate reference solutions in 18O-labeled water with the denitrifier method (Biological Nitrogen Isotope Fractionation project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2021-11-29 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.865519.1 [access date]
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