SCOPE AND APPLICATION
This method is applicable to the analysis of ground water, drinking, surface, and saline waters, and domestic and industrial wastes.
The method is capable of measuring phenolic materials at the 5 ug/L level when the colored end product is extracted and concentrated in a solvent phase using phenol as a standard.
The method is capable of measuring phenolic materials that contain more than 50 ug/L in the aqueous phase (without solvent extraction) using phenol as a standard.
It is not possible to use this method to differentiate between different kinds of phenols.
SUMMARY OF METHOD
Phenolic materials react with 4-aminoantipyrine in the presence of potassium ferricyanide at a pH of 10 to form a stable reddish-brown antipyrine dye. The amount of color produced is a function of the concentration of phenolic material.