H2S and Methyl Mercaptan recovery has continued to be an analytical challenge when sampled into canisters at PPB to sub-PPB levels. The presence of more than 10–15% relative humidity within a sampling canister has been shown to dramatically reduce reliable storage time of H2S and to a lesser extent Methyl Mercaptan, relative to dry samples.
Fortunately, Entech offers an economical solution. Now, laboratories can choose to collect H2S and Methyl Mercaptan samples into new H2S Bottle-VacTM canisters. These canisters are designed to accommodate a specific amount of Silica gel within the sampler in order to dehydrate the sample upon collection. This small amount of Silica gel effectively removes more than 90% of the water vapor without effecting quantitative recoveries of H2S and Methyl Mercaptan. Easily collect H2S, COS, and MeSH into 500mL and 1L H2S Bottle-VacTM canisters and reliably retain >80% recovery even after a 1–2 week storage time prior to analysis. For the collection of heavier sulfur compounds which are less affected by humidity levels, simply utilize standard Bottle-VacTM or SiloniteTM canisters.