Results and observations from the measurement of DOC and DON in seawater using a high-temperature catalytic oxidation technique

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Abstract

Operating temperatures for the high-temperature catalytic oxidation of dissolved organic matter (DOM) in seawater were evaluated for optimization of total dissolved nitrogen analysis. In addition, the possibility of NO2 being produced upon combustion, a gas not seen by the detector used here, was explored. Finally, some concentrations of dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) in coastal waters are reported. NO was most efficiently passed through the combustion furnace at temperatures 40°C or more above the 680°C temperature recommended earlier for DOM analysis. NO2 was apparently not an important product of combustion, as an NO2 calibration gas was efficiently converted to NO in the furnace and because the addition of a ferrous sulfate NO2 converter did not result in significant increases in the detector response. DOC and DON concentrations were determined in seawater collected from three coastal sites-Santa Monica Basin and Monterey Bay in California and the Bering Sea inner shelf. The highest near-surface concentration of DOC reported here (123μM at 20 m) was found in Monterey Bay, and the lowest value (72 μM at 20m) was found in the Bering Sea. The highest DON concentration found in the surface 50 m was 6.0 μM in Santa Monica Basin.

Original languageEnglish (US)
Pages (from-to)195-202
Number of pages8
JournalMarine Chemistry
Volume41
Issue number1-3
DOIs
StatePublished - 1993
Externally publishedYes

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dissolved organic nitrogen
Thermooxidation
Catalytic oxidation
Organic carbon
Seawater
dissolved organic carbon
Nitrogen
combustion
seawater
oxidation
dissolved organic matter
ferrous sulfate
Biological materials
Furnaces
Gases
temperature
Detectors
gas
basin
coastal water

ASJC Scopus subject areas

  • Chemistry(all)
  • Oceanography

Cite this

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title = "Results and observations from the measurement of DOC and DON in seawater using a high-temperature catalytic oxidation technique",
abstract = "Operating temperatures for the high-temperature catalytic oxidation of dissolved organic matter (DOM) in seawater were evaluated for optimization of total dissolved nitrogen analysis. In addition, the possibility of NO2 being produced upon combustion, a gas not seen by the detector used here, was explored. Finally, some concentrations of dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) in coastal waters are reported. NO was most efficiently passed through the combustion furnace at temperatures 40°C or more above the 680°C temperature recommended earlier for DOM analysis. NO2 was apparently not an important product of combustion, as an NO2 calibration gas was efficiently converted to NO in the furnace and because the addition of a ferrous sulfate NO2 converter did not result in significant increases in the detector response. DOC and DON concentrations were determined in seawater collected from three coastal sites-Santa Monica Basin and Monterey Bay in California and the Bering Sea inner shelf. The highest near-surface concentration of DOC reported here (123μM at 20 m) was found in Monterey Bay, and the lowest value (72 μM at 20m) was found in the Bering Sea. The highest DON concentration found in the surface 50 m was 6.0 μM in Santa Monica Basin.",
author = "Hansell, {Dennis A}",
year = "1993",
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volume = "41",
pages = "195--202",
journal = "Marine Chemistry",
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TY - JOUR

T1 - Results and observations from the measurement of DOC and DON in seawater using a high-temperature catalytic oxidation technique

AU - Hansell, Dennis A

PY - 1993

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N2 - Operating temperatures for the high-temperature catalytic oxidation of dissolved organic matter (DOM) in seawater were evaluated for optimization of total dissolved nitrogen analysis. In addition, the possibility of NO2 being produced upon combustion, a gas not seen by the detector used here, was explored. Finally, some concentrations of dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) in coastal waters are reported. NO was most efficiently passed through the combustion furnace at temperatures 40°C or more above the 680°C temperature recommended earlier for DOM analysis. NO2 was apparently not an important product of combustion, as an NO2 calibration gas was efficiently converted to NO in the furnace and because the addition of a ferrous sulfate NO2 converter did not result in significant increases in the detector response. DOC and DON concentrations were determined in seawater collected from three coastal sites-Santa Monica Basin and Monterey Bay in California and the Bering Sea inner shelf. The highest near-surface concentration of DOC reported here (123μM at 20 m) was found in Monterey Bay, and the lowest value (72 μM at 20m) was found in the Bering Sea. The highest DON concentration found in the surface 50 m was 6.0 μM in Santa Monica Basin.

AB - Operating temperatures for the high-temperature catalytic oxidation of dissolved organic matter (DOM) in seawater were evaluated for optimization of total dissolved nitrogen analysis. In addition, the possibility of NO2 being produced upon combustion, a gas not seen by the detector used here, was explored. Finally, some concentrations of dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) in coastal waters are reported. NO was most efficiently passed through the combustion furnace at temperatures 40°C or more above the 680°C temperature recommended earlier for DOM analysis. NO2 was apparently not an important product of combustion, as an NO2 calibration gas was efficiently converted to NO in the furnace and because the addition of a ferrous sulfate NO2 converter did not result in significant increases in the detector response. DOC and DON concentrations were determined in seawater collected from three coastal sites-Santa Monica Basin and Monterey Bay in California and the Bering Sea inner shelf. The highest near-surface concentration of DOC reported here (123μM at 20 m) was found in Monterey Bay, and the lowest value (72 μM at 20m) was found in the Bering Sea. The highest DON concentration found in the surface 50 m was 6.0 μM in Santa Monica Basin.

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U2 - 10.1016/0304-4203(93)90119-9

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JF - Marine Chemistry

SN - 0304-4203

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