FIELD: photometric analysis of aromatic hydroxiderivatives in natural water and sewage. SUBSTANCE: method includes treatment of analyzed solution at pH from 9.0 to 12.0 with tetrafluoroborate of 4-nitrophenyldiasonium up to concentration 0.01-0.03 M and with cation surface-active substances up to concentration $$$ M, sorption of formed colored nitrocompound on polyurethane and measurement of diffuse reflection. EFFECT: improved authenticity of method. 6 tbl
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