FIELD: chemistry.
SUBSTANCE: invention relates to a method of concentrating pyrogallol from aqueous solutions, which can be recommended for analytical inspection of sewage coming in for biological treatment. The dislcosed method involves concentration of pyrogallol from aqueous solutions acidified to pH=1-5 at temperature of 20±2°C using an organic solvent of tributyl phosphate, said tributyl phosphate modifying crushed rigid polyurethane foam in weight ratio of polyurethane foam to tributyl phosphate equal to 1:(2.0-2.6).
EFFECT: method increases the concentration factor of pyrogallol and reduces consumption of organic solvent.
2 ex, 1 tbl
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