Development and application of organic reagents for analysis-VII Extraction and fluorimetric determination of perchlorate ions with 2,6-di-p-tolyl-4-phenylpyrylium chloride

An extraction-fluorimetric method for the determination of micro quantities of perehlorate ions, based on their extraction into chlorobenzene with 2,6-di-p)-tolyl-4-phenylpyrylium chloride (DTPP(+)-Cl(-)) has been developed. DTPF(+)-Cl(-), a newly synthesized reagent, reacts with perchlorate ions to form 1:1 ion-pairs, which can be extracted into chlorobenzene. The ion-pair (DTPP(+)-ClO(4)(-)) has very strong yellowish-green fluorescence in chlorobenzene, with an emission maximum at 376 nm. The relationship between perchlorate ion concentration and relative fluorescence intensity is linear over the range 0.01-1.0 ppm. Several inorganic perchlorates have been determined satisfactorily by the method.