TEST METHOD FOR THE TOTAL CONTENT OF NON-VOLATILE PHENOLS IN WASTEWATER
I. JOHANNES
L. MÖLDER
L. TIIKMA
Institute of Chemistry
Tallinn Technical University
15 Akadeemia St., Tallinn
12618 Estonia
| An instruction for testing of the total content of non-volatile by steam phenols
(resorcinol and naphthol alkyl derivatives) in water is given. The colorimetric method is based on the formation of red
cobalt complexes specially with nitrosated resorcinol and naphthol series phenols when sodium nitrite and cobalt sulphate
are added to the slightly acidic sample. Test Method I regards co-existence of phenolic compounds which can be subjected to mono- and dinitroso substitutions and subsequently give two types of cobalt complexes. Test Method II reports the test results as 2,5-dimethylresorcinol. |