FIELD: organic and analytical chemistry.
SUBSTANCE: invention can be recommended for concentrating diphenylamine in analytical control of treated sewages from plants of paint and varnish manufacture. Method for concentrating diphenylamine from aqueous solutions involves extraction with diethyl phthalate taken in the concentration 1.0 mole/dm3 in hexane wherein diethyl phthalate is impregnated preliminary in polyurethane foam wherein mass part of solution is 60-65% with respect to polyurethane foam. Invention provides increasing the concentrating coefficient by about 20 times under conditions of practically complete extraction of diphenylamine from aqueous solutions.
EFFECT: improved concentrating method.
2 tbl, 4 ex
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