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Re‐evaluation of high temperature combustion and chemical oxidation measurements of dissolved organic carbon in seawater
Author(s) -
Sharp Jonathan H.,
Benner Ronald,
Bennett Lenore,
Carlson Craig A.,
Dow Rachael,
Fitzwater Steve E.
Publication year - 1993
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.1993.38.8.1774
Subject(s) - seawater , blank , dissolved organic carbon , environmental chemistry , carbon fibers , environmental science , total organic carbon , sargasso sea , chemistry , oceanography , geology , materials science , composite number , composite material
Various commercial HTC analyzers are now being used in marine laboratories with inconsistent and less than uniform results. A small intercalibration exercise was held in Bermuda to compare results from several commercial HTC analyzers and the traditional wet chemical oxidation method. The exercise utilized a single low carbon water to determine the instrument blank, and a single set of standards was used for all analyses. Five Sargasso Sea water samples from the surface to 4,000 m and a dried extract of dissolved organic matter from a black‐water river were used as the samples for comparison. Analyses by the four methods agreed within 15%, and the seawater values were similar to previously published values. The results demonstrate the importance of careful instrument blank determination and of accurate determination of the CO 2 peak.
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