Friestad's method for the determination of phenol with 3-methyl-2-benzo-thiazolinone hydrazone (MBTH) has been evaluated. The Friestad manual and automated MBTH methods were modified to lower the detection limit from 1 mg l–1 to 1 µg l–1. The values for phenol obtained by this method on river water and industrial waste samples were equal to or greater than those obtained by the 4-aminophenazone method.
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Morris E. Gales (1975) studied this question.
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