Sensitivity and accuracy of the H2S sampler

A test program was conducted to check the sensitivity and the accuracy of the hydrogen sulfide (H2S) paper tape sampler as it has been used since its introduction several years ago. Test data from this sampler were compared with those from a sampler modified by researchers from the San Francisco Bay Area Air Pollution Control District. A Mylar bag was used as a container into which laboratory air and a measured quantity of reagent-quality H2S were placed to produce a sample of known concentration. A Research Appliance Company standard G2SE sampler with a recorder was used to draw the sample from the bag and read the tape. The data show that the modifications made by the Bay Area Pollution Control District increased the sensitivity over the 0- to 60-ppb range; however, the shape of the modified curve remained the same as that of the original curve. The data also showed that the percentage accuracy remained approximately the same on both the modified and the original curves, the magnitude of the plus or min...