Hydrogen sulfide determination by solid surface luminescence

Abstract

In the analytical system suggested, atmospheric hydrogen sulfide reacts with the surface of a filter paper treated with aqueous cadmium chloride and yields a luminescent species whose intensity can be correlated with the analyte concentration in ambient air. It was shown that the luminescent species are CdS solid particles which were formed in a well defined size. The paper luminescence was also tried on polymeric surfaces; polyethyleneoxide, polyvinyl alcohol, ethylcellulose and carboxymethylcellulose were found to give a similar luminescence signal. The system can be used on the tip of an optical fiber for an irreversible, cumulative type of analytical device for hydrogen sulfide determination. The 3s detection limit for the paper luminescence detection system was 7.8 ppb H S.

A novel sorbent tube for ambient hydrogen sulfide determination

“…It was previously demonstrated that atmospheric hydrogen sulfide reacts with the surface of a filter paper treated with aqueous CdCl 2 and yields a luminescent species whose intensity can be correlated with the analyte concentration in ambient air [7]. It has also been shown that the luminescent species is CdS solid particles which were formed in a well-defined size [7].…”

“…It has also been shown that the luminescent species is CdS solid particles which were formed in a well-defined size [7]. In this study, the similar principles were employed for signal formation using a tubular device which is familiar to most users for monitoring toxic gases in a rapid, simple and inexpensive way.…”

“…By using an IR pellet preparation kit, the solid materials which remained on the filter paper were pelletized and placed in the reaction chamber which has been described previously [7]. The luminescence signals on these solid substrates were then measured by the luminescence spectrometer utilizing a solid surface accessory.…”

“…In the previous study [7], filter paper was chosen because of its low cost and high performance as a substrate. In this study, in order to make the measurements in a tubular device, a material consisting of particles of well-defined mesh size was sought for, so that it can be easily and conveniently filled into a glass tube.…”

“…Since they have been studied extensively in the previous paper [7], the optimum values obtained as 0.5 M CdCl 2 and 70% relative humidity were used throughout this study. It should be stressed that, although the presence of humidity is useful for sampling the gas, the normal laboratory temperature and ambient humidity could be employed during the visual examination and the length of the luminescent part is practically not affected by these parameters once it has been formed.…”