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Titanium (III) trichloride is validated here for the quantitative conversion of all nitrate plus nitrite in seawater to nitric oxide gas, thereby providing an alternative to the typically used reducing agent, ferrous ammonium sulfate plus ammonium molybdate, in the chemiluminescent detection of nitrate plus nitrite at the nanomolar level. We find that both Fe(II)+Mo(VI) and Ti(III) methods yield identical...
We compare the output of an 18-box geochemical model of the ocean with measurements to investigate the controls on both the mean values and variation of nitrate δ 15 N and δ 18 O in the ocean interior. The δ 18 O of nitrate is our focus because it has been explored less in previous work. Denitrification raises the δ 15 N and δ 18 O of mean ocean nitrate by equal...
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