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

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 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.

scholarly journals Evidence of Substantial Carbon Isotope Fractionation among Substrate, Inorganic Carbon, and Biomass during Aerobic Mineralization of 1,2-Dichloroethane byXanthobacter autotrophicus

2000 ◽  
Vol 66 (11) ◽  
pp. 4870-4876 ◽  
Author(s):  
D. Hunkeler ◽  
R. Aravena
Keyword(s):  
Carbon Isotope ◽  
Isotope Effect ◽  
Isotope Fractionation ◽  
Kinetic Isotope Effect ◽  
Inorganic Carbon ◽  
Mechanistic Model ◽  
Fractionation Factor ◽  
Carbon Isotope Fractionation ◽  
Kinetic Isotope ◽  
Factor Α

ABSTRACT Carbon isotope fractionation during aerobic mineralization of 1,2-dichloroethane (1,2-DCA) by Xanthobacter autotrophicusGJ10 was investigated. A strong enrichment of 13C in residual 1,2-DCA was observed, with a mean fractionation factor α ± standard deviation of 0.968 ± 0.0013 to 0.973 ± 0.0015. In addition, a large carbon isotope fractionation between biomass and inorganic carbon occurred. A mechanistic model that links the fractionation factor α to the rate constants of the first catabolic enzyme was developed. Based on the model, it was concluded that the strong enrichment of 13C in 1,2-DCA arises because the first irreversible step of the initial enzymatic transformation of 1,2-DCA consists of an SN2 nucleophilic substitution. SN2 reactions are accompanied by a large kinetic isotope effect. The substantial carbon isotope fractionation between biomass and inorganic carbon could be explained by the kinetic isotope effect associated with the initial 1,2-DCA transformation and by the metabolic pathway of 1,2-DCA degradation. Carbon isotope fractionation during 1,2-DCA mineralization leads to 1,2-DCA, inorganic carbon, and biomass with characteristic carbon isotope compositions, which may be used to trace the process in contaminated environments.

scholarly journals CO2-dependent carbon isotope fractionation in dinoflagellates relates to their inorganic carbon fluxes

2016 ◽  
Vol 481 ◽  
pp. 9-14 ◽  
Author(s):  
Mirja Hoins ◽  
Tim Eberlein ◽  
Dedmer B. Van de Waal ◽  
Appy Sluijs ◽  
Gert-Jan Reichart ◽  
...  
Keyword(s):  
Carbon Isotope ◽  
Isotope Fractionation ◽  
Inorganic Carbon ◽  
Carbon Fluxes ◽  
Carbon Isotope Fractionation
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