| abstract |
Provided is a method for simultaneously determining nitrogen and oxygen isotopic composition of natural nitrate and nitrogen and oxygen isotopic composition of natural nitrite, comprising: quantitatively converting nitrate and nitrite into corresponding organic esters and nitro compounds, and then using gas chromatography/pyrolysis/gas chromatography/isotope ratio mass spectrometry combined technique to simultaneously determine δ18O and δ15N of nitrate and those of nitrite. The method for simultaneously determining nitrogen and oxygen isotopic composition of natural nitrate and nitrogen and oxygen isotopic composition of natural nitrite requires a small amount of sample, and does not cause loss, obtaining, exchange, and fractionation of nitrogen and oxygen. |