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THE MEASUREMENT OF DISSOLVED ORGANIC AND PARTICULATE CARBON IN SEAWATER 1
Author(s) -
Menzel David W.,
Vaccaro Ralph F.
Publication year - 1964
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1964.9.1.0138
Subject(s) - ampoule , particulates , oxidizing agent , carbon fibers , seawater , analytical chemistry (journal) , spectrum analyzer , calibration , combustion , calibration curve , nitrogen , volume (thermodynamics) , chemistry , total organic carbon , mineralogy , environmental chemistry , chromatography , materials science , detection limit , geology , physics , oceanography , statistics , mathematics , organic chemistry , engineering , quantum mechanics , composite number , electrical engineering , composite material
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.