Spectrophotometric Determination of 1-Naphthylamine - Application to Sea and River Waters

The present work includes a detailed investigation of a new spectrophotometric method for the determination of 1-naphthylamine. The method is based on oxidative coupling reaction of the compound with catechol in the presence of potassium chromate as oxidant in acidic medium to form a stable purplered coloured product which shows maximum absorption at 530 nm. The molar absorptivity is 3685 l.mol-1.cm-1. Beer's law is obeyed over the range of (1- 60) ppm. The method is applied to the recovery of 1-naphthylamine from sea and river water.