A study was carried out to identify suitable tracers for the determination of dispersion pattern ofkraft pulp mill effluent in tropical seawater. As components of the effluent themselves are preferred as tracers over added tracers, analyses were carried out to identify constituents of the effluent occurring in high quantities as well as less volatile in nature. For analytical method involving use of capillary ECD-gas chromatography, possible tracers identified were di-and tri-chloroacetic acids, 1,1-dichlorodimethylsulfone, and 3,4,5-trichlorocatechol