Computer Science
Scientific paper
Jan 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967gecoa..31....7s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 31, Issue 1, pp.7-15
Computer Science
1
Scientific paper
Salts and complexes of sixteen different mono-, di- and trivalent metal ions with a Podzol fulvic acid, a water-soluble soil humic compound, were prepared. Each salt and complex was characterized by chemical and i.r. methods and, in more detail, by thermogravimetry. The DTG curve of untreated fulvic acid exhibited a major peak with a maximum at 420°C which shifted to considerably higher temperatures when the fulvic acid had reacted with monovalent cations, but to lower temperatures when fulvic acid had complexed with di- and trivalent metal ions. The Na-, K- and Li-salts of fulvic acid appeared to be converted to inorganic carbonates at temperatures >700°C, whereas the NH 4 -salt of fulvic acid formed the carbonate at >550°C. The stabilities of the metal--fulvic acid complexes, as measured by an ion-exchange equilibrium method, appeared in general to be inversely related to their thermal stabilities as indicated by major DTG peaks.
Hoffman I.
Schnitzer Morris
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