Abstract
A probe inlet for membrane-inlet mass spectrometry (MIMS) was developed to measure dissolved nitrogen and argon gas in sediment porewaters. This technique represents a significant improvement in the measurement of dissolved gas ratios in sediment cores and in small volume samples (<5 ml). The probe is stable, inexpensive and has relatively fast equilibration times (∼ 4-5 min) for dissolved N2/Ar ratio analyses. The membrane probe is mounted at the end of a stainless steel capillary (0.75 mm OD) connected directly to the inlet system of a quadrupole mass spectrometer. The membrane is ∼ 1 mm x 0.5 mm resulting in profiles that have a depth resolution of < 2 mm. Nitrogen/argon ratios measured with the probe inlet have a precision of < 0.2%. Porewater N2/Ar ratios measured in cores collected from Raritan Bay, NJ, indicated that N2 was in equilibrium with the atmosphere in overlying waters and that nitrogen was up to 8% supersaturated by a depth of 1 cm. The increase in N2 is consistent with nitrogen production from denitrification of ∼ 2 mmol N2 m-2 day-1. High-resolution nitrate profiles also provide evidence for denitrification, with nitrate being depleted at the same depth horizon where N2 gas concentrations are increasing.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 23-30 |
| Number of pages | 8 |
| Journal | Marine Chemistry |
| Volume | 83 |
| Issue number | 1-2 |
| State | Published - Oct 2003 |
| Externally published | Yes |
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Keywords
- Denitrification
- High-resolution nitrogen gas profile
- Membrane-inlet mass spectrometry
- Sediment porewater
ASJC Scopus subject areas
- Chemistry(all)
- Oceanography
Cite this
High-resolution nitrogen gas profiles in sediment porewaters using a new membrane probe for membrane-inlet mass spectrometry. / Hartnett, Hilairy; Seitzinger, Sybil P.
In: Marine Chemistry, Vol. 83, No. 1-2, 10.2003, p. 23-30.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - High-resolution nitrogen gas profiles in sediment porewaters using a new membrane probe for membrane-inlet mass spectrometry
AU - Hartnett, Hilairy
AU - Seitzinger, Sybil P.
PY - 2003/10
Y1 - 2003/10
N2 - A probe inlet for membrane-inlet mass spectrometry (MIMS) was developed to measure dissolved nitrogen and argon gas in sediment porewaters. This technique represents a significant improvement in the measurement of dissolved gas ratios in sediment cores and in small volume samples (<5 ml). The probe is stable, inexpensive and has relatively fast equilibration times (∼ 4-5 min) for dissolved N2/Ar ratio analyses. The membrane probe is mounted at the end of a stainless steel capillary (0.75 mm OD) connected directly to the inlet system of a quadrupole mass spectrometer. The membrane is ∼ 1 mm x 0.5 mm resulting in profiles that have a depth resolution of < 2 mm. Nitrogen/argon ratios measured with the probe inlet have a precision of < 0.2%. Porewater N2/Ar ratios measured in cores collected from Raritan Bay, NJ, indicated that N2 was in equilibrium with the atmosphere in overlying waters and that nitrogen was up to 8% supersaturated by a depth of 1 cm. The increase in N2 is consistent with nitrogen production from denitrification of ∼ 2 mmol N2 m-2 day-1. High-resolution nitrate profiles also provide evidence for denitrification, with nitrate being depleted at the same depth horizon where N2 gas concentrations are increasing.
AB - A probe inlet for membrane-inlet mass spectrometry (MIMS) was developed to measure dissolved nitrogen and argon gas in sediment porewaters. This technique represents a significant improvement in the measurement of dissolved gas ratios in sediment cores and in small volume samples (<5 ml). The probe is stable, inexpensive and has relatively fast equilibration times (∼ 4-5 min) for dissolved N2/Ar ratio analyses. The membrane probe is mounted at the end of a stainless steel capillary (0.75 mm OD) connected directly to the inlet system of a quadrupole mass spectrometer. The membrane is ∼ 1 mm x 0.5 mm resulting in profiles that have a depth resolution of < 2 mm. Nitrogen/argon ratios measured with the probe inlet have a precision of < 0.2%. Porewater N2/Ar ratios measured in cores collected from Raritan Bay, NJ, indicated that N2 was in equilibrium with the atmosphere in overlying waters and that nitrogen was up to 8% supersaturated by a depth of 1 cm. The increase in N2 is consistent with nitrogen production from denitrification of ∼ 2 mmol N2 m-2 day-1. High-resolution nitrate profiles also provide evidence for denitrification, with nitrate being depleted at the same depth horizon where N2 gas concentrations are increasing.
KW - Denitrification
KW - High-resolution nitrogen gas profile
KW - Membrane-inlet mass spectrometry
KW - Sediment porewater
UR - http://www.scopus.com/inward/record.url?scp=0345447482&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0345447482&partnerID=8YFLogxK
M3 - Article
VL - 83
SP - 23
EP - 30
JO - Marine Chemistry
JF - Marine Chemistry
SN - 0304-4203
IS - 1-2
ER -