Abstract
A diffusive sampling device (DSD) has been developed for collection of μgm^<-3> levels of hydrogen sulf ide in ambient air. It consists of porous particles coated with zinc acetate as a absorbent, a porous sintered polyethylene tube which act as a diffusive membrane, and a small polypropylene syringe which is used for the elution of the analytes from the absorbent. The reaction of hydrogen sulfide with zinc acetate forms zinc sulfide, which can be converted to methylene blue through the reaction with N, N' -dimethyl-p-phenylenediamine. The concentration of methylene blue is measured by the use of an absorption spectrophotometer. Because of high sensitivity, the DSD has great potential in the evaluation of atmospheric environment.
