Abstract
Extraction of humic acids isolated from various soils was studied in polyethylene glycol(NH4)2SO4, polyethylene glycol-dextran, and polyethylene glycol-dextran sodium salt two-phase aqueous polymeric systems. It was shown that, in all systems, humic acids are extracted into the polyethylene glycolrich phase. It was studied how the composition of the extraction system, molecular weight of the polymer, and the sample nature affect the distribution ratios of humic acids.
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