HYDROGEN-SULFIDE DETERMINATION BY SOLID-SURFACE LUMINESCENCE

In the analytical system suggested, atmospheric hydrogen sulfide react s with the surface of a filter paper treated with aqueous cadmium chlo ride and yields a luminescent species whose intensity can be correlate d with the analyte concentration in ambient air. It was shown that the luminescent species are CdS solid particles which were formed in a we ll defined size. The paper luminescence was also tried on polymeric su rfaces; polyethyleneoxide, polyvinyl alcohol, ethylcellulose and carbo xymethylcellulose were found to give a similar luminescence signal. Th e system can be used on the tip of an optical fiber for an irreversibl e, cumulative type of analytical device for hydrogen sulfide determina tion. The 3s detection limit for the paper luminescence detection syst em was 7.8 ppb H2S.