Limnology and Oceanography · 1964 · 873 citations · 3 references
Natural SciencesChemistryOceanographyChemical OceanographyEnvironmental ChemistryOcean InstrumentationEnvironmental AnalysisParticulate Organic MatterCalibration CurvesCarbon Content AnalysisDissolved Organic Carbon CompositionMarine Dissolved Inorganic CarbonParticulate Organic Matter Carbon
A method is described for the rapid determination of dissolved organic carbon in seawater in concentrations between 0.1 and 20 mg/liter. The oxidation is carried out in sealed glass ampoules using K 2 S 2 O 8 as an oxidizing agent after the sample has been freed of inorganic carbon. The resulting CO 2 is passed through a nondispersive infrared analyzer using nitrogen as a carrier and the signal output of the analyzer recorded. Using appropriate calibration curves, the carbon content is determined from the height of the peak. Approximately 100 samples can be analyzed in a single day with a precision of ± 0.1 mg/liter using a sample volume of 5 ml. A companion method is described for the determination of particulate carbon by high‐temperature combustion after concentration of the sample on a glass‐fiber filter. The precision of this method is ± 10 µ g C in a range of 0–500 µ g C. Approximately six samples can be analyzed in an hour.
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