Аннотация:Analytical fractionation conditions on the resin XAD7H of organic substances from gravitational soil water influence the proportion and the yield of the extracted fractions. Increasing the column capacity factor k' is accompanied by a decreased yield of hydrophobic fraction and the change in its composition. The sorption column capacity factor of k' = 30 is sufficient for the extraction of all hydrophobic components from a soil solution with a concentration of CDOM of ~25 mg/L.