INDICATOR TUBES FOR THE DETERMINATION OF ANILINE IN SOLUTIONS

The reaction of indamine formation by the oxidative condensation of N, N-diethyl-p-phenylenediamine with aniline is used as the basis for the test determination of aniline in solutions. The reaction is studied d epending on the nature and the concentration of the oxidant, the acidi ty of solution, and the concentration of the reagent. The retention of N,N-diethyl-p-phenylenediamine and the reaction product N,N-diethyl-p -phenyleneindamine on reversed-phase silica gel, silica gel (Silica ge l F), and silica gel-based ion exchangers (SO3H silica gel and TA sili ca gel) is studied. Indicator tubes are proposed for the determination of 0.002-2.5 mg/L (0.2-25 of MPC) of aniline in solutions. The accura cy and precision of aniline determination with the use of indicator tu bes are comparable with the corresponding characteristics of solid-pha se spectrophotometry procedures.