Journal
MARINE CHEMISTRY
Volume 186, Issue -, Pages 83-89Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.marchem.2016.08.003
Keywords
Nitrate; Titanium trichloride; Seawater; Chemiluminescence
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Funding
- Gordon and Betty Moore Foundation's Marine Microbiology Initiative [3794]
- Simons Foundation (SCOPE Award) [329108]
- National Science Foundation (C-MORE) [DBI-0424599, OCE-1260164]
- Directorate For Geosciences
- Division Of Ocean Sciences [1260164] Funding Source: National Science Foundation
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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 results for standards and seawater samples over a validated concentration range of 1 to 1000 nM, and are both in agreement with traditional colorimetric results. Benefits of the Ti(III) reduction chemistry are: simpler preparation, decreased ammonium contamination in a laboratory that measures low-level nutrients, 30% reduction of the sulfuric acid catalyst, and a higher sample through-put Most importantly, though, this work can be considered the first step on a path toward a much needed, direct measurement of dissolved organic nitrogen concentrations, as has already been achieved for dissolved organic carbon. (C) 2016 Elsevier B.V. All rights reserved.
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