SPECTROFLUOROMETRIC DETERMINATION OF 4-CHLOROBIPHENYL AND AROCHLOR-1221, USING THE FLUORESCENCE QUENCHING PRODUCED BY CETYLPYRIDINIUM BROMIDE MICELLAR MEDIUM

4-Chlorobiphenyl (4-PCB) and Arochlor 1221 have been studied in the pr esence of cetylpyridinium bromide micellar medium. The quenching produ ced by this surfactant on the fluorescence of these organochlorine com pounds has been used to develop two spectrofluorimetric methods for th e sensitive determination of 4-PCB and Arochlor 1221. Variables such a s the percentage of organic solvent, temperature, and concentration of surfactant, as well as the possible interferences of other polychlori nated biphenyls and Arochlors of environmental and toxicological inter est have been studied. The methods have been applied to the determinat ion of 4-PCB and Arochlor 1221 added to sea water with satisfactory re covery data.