Carbon isotopic fractionation by plankton in the Southern Indian Ocean: relationship between δ of particulate organic carbon and dissolved carbon dioxide

1998 ◽  
Vol 17 (1-4) ◽  
pp. 39-58 ◽  
Author(s):  
I. Bentaleb ◽  
M. Fontugne ◽  
C. Descolas-Gros ◽  
C. Girardin ◽  
A. Mariotti ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Indian Ocean ◽  
Organic Carbon ◽  
Particulate Organic Carbon ◽  
Isotopic Fractionation ◽  
Southern Indian Ocean ◽  
Dissolved Carbon ◽  
Carbon Isotopic ◽  
Dissolved Carbon Dioxide ◽  
Carbon Isotopic Fractionation

The dependence on wavelength of 13C isotope effects in photolysis of aqueous solutions of ferrie oxalate

1976 ◽  
Vol 54 (16) ◽  
pp. 2577-2580 ◽  
Author(s):  
Robert H. Betts ◽  
Wayne D. Buchannon
Keyword(s):  
Carbon Dioxide ◽  
Aqueous Solutions ◽  
Isotope Effect ◽  
Isotope Effects ◽  
Isotopic Fractionation ◽  
Isotopic Discrimination ◽  
Carbon Isotopic ◽  
13C Isotope ◽  
Photochemical Activation ◽  
Carbon Isotopic Fractionation

The formation of carbon dioxide by photolysis of aqueous solutions of ferric oxalate is accompanied by carbon isotopic fractionation. 12C appears preferentially in the evolved CO2, but the isotope effect depends markedly on the wavelength of the light used. Fractionation is essentially zero (k12/k13 = 1.001) at 366 nm, and increases with wavelength, reaching 1.050 at 520 nm. It is proposed that this variation of isotopic discrimination arises from the differing properties of the excited levels formed by photochemical activation.

Impact of Dursban and Abate on Microbial Numbers and Some Chemical Properties of Standing Ponds

1975 ◽  
Vol 10 (1) ◽  
pp. 33-41 ◽  
Author(s):  
J. Butcher ◽  
M. Boyer ◽  
CD. Fowle
Keyword(s):  
Carbon Dioxide ◽  
Active Ingredient ◽  
Algal Blooms ◽  
Chemical Properties ◽  
Total Carbon ◽  
Dissolved Carbon ◽  
Photosynthetic Productivity ◽  
Dissolved Carbon Dioxide ◽  
Microbial Numbers

Abstract Eleven small ponds, lined with polyethylene, were used to assess the consequences of applications of *DursbanR at 0.004, 0.030, 0.100 and 1.000 ppm and AbateR at 0.025 and 0.100 ppm active ingredient. The treated ponds showed a more pronounced long-term increase in pH and dissolved oxygen and decreasing total and dissolved carbon dioxide in comparison with untreated ponds. Algal blooms were of longer duration in treated ponds than in controls. Total photosynthetic productivity was higher in treated ponds but bacterial numbers did not change significantly. Photosynthetic productivity was estimated by following the changes in total carbon dioxide.

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