Abstract
Humic acids and related pigments, collectively referred to as humic substances, are widely distributed in soils, natural waters, marine and lake sediments, peat bogs, carbonaceous shales, lignites, brown coals and other miscellaneous deposits [1–5]. In addition, trace amounts may be present in plants [6] and certain carbonaceous meteorites [7]. Szalay [8] concluded that the amount of organic carbon in the earth as humic acids (60 x 1011 tons) exceeds that which occurs in living organisms (7 x 1011 tons).
Appreciation is expressed to the National Science Foundation (Grants GP 1938 and GA 348) for support of research in organic geochemistry.
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Stevenson, F.J., Butler, J.H.A. (1969). Chemistry of Humic Acids and Related Pigments. In: Eglinton, G., Murphy, M.T.J. (eds) Organic Geochemistry. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-87734-6_28
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DOI: https://doi.org/10.1007/978-3-642-87734-6_28
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