A convenient method for the determination of carbon in marine “net zooplankton” |
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| Authors: | Eugene D Traganza James C Radney Kenneth J Graham |
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| Institution: | Departments of Oceanography, Physics and Chemistry, Naval Postgraduate School, Monterey, Calif. U.S.A. |
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| Abstract: | Measurements of carbon in marine “net zooplankton” were made by use of a Leco 70 Second TC-12 Automatic Carbon Determinator. The instrument employs high-temperature (ca. 1600°C), dry-combustion and thermal-conductivity detection of the purified carbon-dioxide combustion product and oxygen carrier gas mixtures. The methodology developed in this study is convenient and rapid (ca. 70 sec per freeze-dried sample), with a mean error () of ±4.4% at the 3 mg-C level and ±7.4% at the 10 mg-C level when benzoic acid is used as a standard, and ±9.2% at the 5 mg-C level and ±6.0% at the 10 mg-C level when casein is used as the standard. The technique was applied to the “splash zone” marine copepod Tigriopus californicus to obtain an average value of 38.6% C by weight. Concentrated samples of “net zooplankton” of varying size fractions were collected in the Monterey upwelling region over an eight-month period. Values up to 2000 mg-C/m2 ocean surface (0–200 m) were observed in a seasonal cycle doubly peaked for some size fractions but not for others. |
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| Keywords: | To whom inquiries should be addressed |
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