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View Actual EPA Method 9067 (PDF File)
EPA Method 9067:PHENOLICS (SPECTROPHOTOMETRIC, MBTH WITH DISTILLATION)
Summary:This method is based on the coupling of phenol with MBTH in an acid medium using ceric ammonium sulfate as an oxidant. The coupling takes place in the p-position; if this position is occupied, the MBTH reagent will react at a free o-position. The colors obtained have maximum absorbance from 460 to 595 nm. For phenol and most phenolic mixtures, the absorbance is 520 and 490 nm.
Scope:This method is applicable to the analysis of ground water, drinking, surface, and saline waters, and domestic and industrial wastes.
Report Number:SW-846 Ch 5