TEST METHOD FOR THE TOTAL CONTENT OF NONVOLATILE PHENOLS IN WASTE-WATER

An instruction for testing of the total content of non-volatile by ste am phenols (resorcinol and naphthol alkyl derivatives) in water is giv en. The colorimetric method is based an the formation of red cobalt co mplexes specially with nitrosated resorcinol and naphthol series pheno ls when sodium nitrite and cobalt sulphate are added to the slightly a cidic sample. Test Method I regards co-existence of phenolic compounds which can De subjected to mono- and dinitroso substitutions and subse quently give two types of cobalt complexes. Test Method II reports the test results as 2,5-dimethylresorcinol.