scholarly journals Quantitative Extraction of Dissolved Inorganic Carbon (as CO2) and Water by Vacuum Distillation from Sediments of the Unsaturated Zone for Carbon Isotope Analysis (13C and 14C)

Radiocarbon ◽  
2007 ◽  
Vol 49 (1) ◽  
pp. 83-94 ◽  
Author(s):  
I Carmi ◽  
J Kronfeld ◽  
Y Yechieli ◽  
D Yakir ◽  
M Stiller ◽  
...  
Keyword(s):  
Carbon Isotope ◽  
Unsaturated Zone ◽  
Vacuum Distillation ◽  
Isotope Fractionation ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Tap Water ◽  
Isotope Analysis ◽  
Standard Addition ◽  
Quantitative Extraction

Vacuum distillation is shown to be useful for the quantitative extraction of dissolved inorganic carbon (as CO2) and water from sediments of the unsaturated zone in the Coastal Aquifer of Israel. Several tests of vacuum extractions from tap water and sediments are presented, including standard addition, which show that the distillation procedure is quantitative, with minimal or no carbon isotope fractionation. The optimal temperature of the sediment during the extraction was also defined. Examples of vacuum extractions of sediments are shown.

Carbon isotope fractionation of dissolved inorganic carbon (DIC) due to outgassing of carbon dioxide from a headwater stream

2008 ◽  
Vol 22 (14) ◽  
pp. 2410-2423 ◽  
Author(s):  
Daniel H. Doctor ◽  
Carol Kendall ◽  
Stephen D. Sebestyen ◽  
James B. Shanley ◽  
Nobuhito Ohte ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Isotope ◽  
Isotope Fractionation ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Headwater Stream ◽  
Carbon Isotope Fractionation

A new method to reconstruct fish diet and movement patterns from δ13C values in otolith amino acids

2011 ◽  
Vol 68 (8) ◽  
pp. 1330-1340 ◽  
Author(s):  
Kelton W. McMahon ◽  
Marilyn L. Fogel ◽  
Beverly J. Johnson ◽  
Leah A. Houghton ◽  
Simon R. Thorrold
Keyword(s):  
Carbon Isotope ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Isotope Analysis ◽  
Population Connectivity ◽  
Fish Diet ◽  
Bulk Analysis ◽  
Dietary Record ◽  
Highly Correlated ◽  
Analyze Amino Acid

Fish ecologists have used geochemical values in otoliths to examine habitat use, migration, and population connectivity for decades. However, it remains difficult to determine an unambiguous dietary δ13C signature from bulk analysis of otolith. Studies to date have focused on the aragonite component of otoliths with less attention paid to the organic fraction. We describe the application of compound-specific stable isotope analysis (SIA) to analyze amino acid (AA) δ13C values from small amounts (<1 mg) of otolith powder. We examined δ13C values of otolith and muscle AAs from a reef-associated snapper (Lutjanus ehrenbergii (Peters, 1869)) collected along a carbon isotope gradient (isoscape) from seagrass beds to coral reefs. Carbon isotope values in otolith and muscle samples were highly correlated within and among coastal habitats. Moreover, δ13C values of otolith AAs provided a purely dietary record that avoided dilution from dissolved inorganic carbon. Otolith AAs served as a robust tracer of δ13C values at the base of the food web, making compound-specific SIA a powerful tool for dietary reconstructions and tracking the movement of fishes across isoscapes.

pH-Dependent Equilibrium Isotope Fractionation Associated with the Compound Specific Nitrogen and Carbon Isotope Analysis of Substituted Anilines by SPME-GC/IRMS

2011 ◽  
Vol 83 (5) ◽  
pp. 1641-1648 ◽  
Author(s):  
Marita Skarpeli-Liati ◽  
Aurora Turgeon ◽  
Ashley N. Garr ◽  
William A. Arnold ◽  
Christopher J. Cramer ◽  
...  
Keyword(s):  
Carbon Isotope ◽  
Isotope Fractionation ◽  
Isotope Analysis ◽  
Substituted Anilines ◽  
Ph Dependent ◽  
Carbon Isotope Analysis

Can algal photosynthetic inorganic carbon isotope fractionation be predicted in lakes using existing models?

2006 ◽  
Vol 68 (2) ◽  
pp. 142-153 ◽  
Author(s):  
Darren L. Bade ◽  
Michael L. Pace ◽  
Jonathan J. Cole ◽  
Stephen R. Carpenter
Keyword(s):  
Carbon Isotope ◽  
Isotope Fractionation ◽  
Inorganic Carbon ◽  
Carbon Isotope Fractionation

scholarly journals Radiocarbon isotopic evidence for assimilation of atmospheric CO<sub>2</sub> by the seagrass <i>Zostera marina</i>

2015 ◽  
Vol 12 (20) ◽  
pp. 6251-6258 ◽  
Author(s):  
K. Watanabe ◽  
T. Kuwae
Keyword(s):  
Carbon Source ◽  
Zostera Marina ◽  
Inorganic Carbon ◽  
Aquatic Vegetation ◽  
Dissolved Inorganic Carbon ◽  
Isotope Analysis ◽  
Co2 Exchange ◽  
Atmospheric Co2 ◽  
Isotopic Signatures ◽  
Seagrass Meadows

Abstract. Submerged aquatic vegetation takes up water-column dissolved inorganic carbon (DIC) as a carbon source across its thin cuticle layer. It is expected that marine macrophytes also use atmospheric CO2 when exposed to air during low tide, although assimilation of atmospheric CO2 has never been quantitatively evaluated. Using the radiocarbon isotopic signatures (Δ14C) of the seagrass Zostera marina, DIC and particulate organic carbon (POC), we show quantitatively that Z. marina takes up and assimilates atmospheric modern CO2 in a shallow coastal ecosystem. The Δ14C values of the seagrass (−40 to −10 ‰) were significantly higher than those of aquatic DIC (−46 to −18 ‰), indicating that the seagrass uses a 14C-rich carbon source (atmospheric CO2, +17 ‰). A carbon-source mixing model indicated that the seagrass assimilated 0–40 % (mean, 17 %) of its inorganic carbon as atmospheric CO2. CO2 exchange between the air and the seagrass might be enhanced by the presence of a very thin film of water over the air-exposed leaves during low tide. Our radiocarbon isotope analysis, showing assimilation of atmospheric modern CO2 as an inorganic carbon source, improves our understanding of the role of seagrass meadows in coastal carbon dynamics.

scholarly journals Seawater-buffered diagenesis, destruction of carbon isotope excursions, and the composition of DIC in Neoproterozoic oceans

2019 ◽  
Vol 116 (38) ◽  
pp. 18874-18879 ◽  
Author(s):  
Paul F. Hoffman ◽  
Kelsey G. Lamothe
Keyword(s):  
Shallow Water ◽  
Carbon Isotope ◽  
Deep Sea ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Open Ocean ◽  
Carbonate Sediments ◽  
Carbonate Platforms ◽  
Mg Isotopes ◽  
Marine Platform

Carbonate sediments of nonglacial Cryogenian (659 to 649 Ma) and early Ediacaran (635 to 590 Ma) age exhibit large positive and negative δ13Ccarb excursions in a shallow-water marine platform in northern Namibia. The same excursions are recorded in fringing deep-sea fans and in carbonate platforms on other paleocontinents. However, coeval carbonates in the upper foreslope of the Namibian platform, and to a lesser extent in the outermost platform, have relatively uniform δ13Ccarb compositions compatible with dissolved inorganic carbon (DIC) in the modern ocean. We attribute the uniform values to fluid-buffered diagenesis that occurred where seawater invaded the sediment in response to geothermal porewater convection. This attribution, which is testable with paired Ca and Mg isotopes, implies that large δ13Ccarb excursions observed in Neoproterozoic platforms, while sedimentary in origin, do not reflect the composition of ancient open-ocean DIC.

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