The Influence of IronHumus Compounds
on ⁹⁰Sr Fixation in Soil

Yu. I. Bondar’, L. S. Ivashkevich, and G. S. Shmanai

Institute of Radiobiology, Belarussian Academy of Sciences, Minsk, Belarus

Received November 13, 2000

Abstract—The relationship between the content of iron–organic compounds in soil and the soil capacity for
⁹⁰Sr fixation has been studied. The distribution of Fe, Al, and ⁹⁰Sr by organic matter fractions of different soil
types has been analyzed. It is shown that the larger part of iron–humus compounds and adsorbed ⁹⁰Sr in soddy-
podzolic soil are concentrated in the fraction of fulvic acids. In peat soil, more than 70% of ⁹⁰Sr is fixed in the
fraction of nonhydrolyzable residue (humin fraction); the content of iron–humus compounds in this fraction
does not exceed 20% of their total amount in the soil.

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