Physics
Scientific paper
May 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971gecoa..35..471s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 35, Issue 5, pp.471-483
Physics
6
Scientific paper
Humic and fulvic acids from several sources were separated into three spectral types depending upon their infrared absorption characteristics. Those belonging to Type I showed equally strong bands at 1720 and 1600 cm -1 , with no discernible absorption being evident at 1640 cm -1 . A distinguishing characteristic of the preparations giving spectra of Type II was a very strong 1720 cm -1 band, a shoulder at 1650 cm -1 , and the absence of a 1600 cm -1 band. The preparations of Type III showed pronounced bands indicative of proteins and carbohydrates. Observed spectral changes in the 1700-1600 cm -1 region indicated that the humification process consisted, in part, of a loss of COOH groups and a change in the environment of C=O from the free or weakly H-bonded state to strongly chelated forms.
Goh K. M.
Stevenson F. J.
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