The values of toxic components like $\ce{H2S}$, $\ce{NO}$, $\ce{SO2}$, etc. [in ppm level] get decreased after a while due to adsorption phenomenon. Manufacturers design some internal treatments in order to prevent adsorption to obtain a stable mixture.

  1. Do you have detailed information about different kinds of these treatments or do you know where I could find them?
  2. What are other solutions leading to resolve this problem?

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