Abstract
Humic substances extracted with chelating resin from a Dark Brown Chernozem (Typic Haploboroll) Ah, a Black Chernozem (Udic Haploboroll) Ah, and a Dark Gray Luvisol (Typic Cryoboralf) Ahe were fractionated by Bio-Gel P. The eluted material was combined to form three or four fractions for further characterization.
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