Determination of phenol in water by flow injection analysis

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Summary

The adaptation of the manual standard method for the determination of phenols is described, e.g., condensation with 4-amino-antipyrine with subsequent oxidation and spectrophotometric detection. A FIA manifold for the automation of the phenol determination in the ranges 0.05–1.0 ppm and 1–15 ppm is presented. At a maximum injection frequency of 105/h the repeatability of consecutive injections is generally better than 1.5% r.s.d. resp. 1.0% r.s.d. By application of a new extraction module also the chloroform extraction step of the formed dye is automized. Compared to the direct FIA manifold a maximum sensitivity enhancement of 3.5 is obtained. The detection limit is 0.005 ppm phenol. In addition to the FIA methods a forced steam distillation procedure is described, which allows the distillation of phenols within 2–5 min.