Аннотация:Analytical fractionation conditions on the resin XAD-7H 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.