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Protonation equilibria of marine dissolved organic matter 1
Author(s) -
Huizenga Douglas L.,
Kester Dana R.
Publication year - 1979
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.1979.24.1.0145
Subject(s) - dissolved organic carbon , seawater , environmental chemistry , titration , organic matter , chemistry , total organic carbon , estuary , adsorption , protonation , base (topology) , inorganic chemistry , oceanography , geology , organic chemistry , ion , mathematical analysis , mathematics
Dissolved organic matter isolated by activated charcoal adsorption from river, estuarine, coastal, and open ocean waters was examined by acid‐base titration in 0.7 molal NaClO 4 medium. Two types of sites were present in the pH range 2–8. One set of sites with an inflection point at pH 3.5 amounted to 11 µ mol of sites per milligram of organic carbon. These sites were present in all samples and showed uniform properties among the samples from different marine environments. A second set of sites with an inflection point at pH 6.5 was present in some samples and amounted to <1 µ mol of sites per milligram of organic carbon. These results provide a characterization of the acid‐base equilibria of marine organic matter which is required in an assessment of possible trace metal‐organic interactions in seawater.