| http://www.w3.org/ns/prov#value | - More particularly, this invention provides methods for reducing concentrations of trace contaminants in inert and non-reactive gases to parts-per-billion (ppb) and sub-parts-per-billion (sub-ppb)levels using an ultra-low emission carbon based scavenger, wherein the impurities include carbon monoxide, carbon dioxide, and organic compounds such as hydrocarbons.
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