Abstract To reduce the detection limits of aniline and its various chloroderivatives (all isomers of mono-and dichloroanilines, 2, 4, 5-, 2, 4, 6-, and 3, 4, 5-trichloroanilines, pentachloroaniline) in aqueous media we suggested bromination reaction, followed by gas chromatographic definition bromo derivatives of chloroanilines on a selective electron capture detector. To identify the products of bromination of chloroaniline in combination ...