| http://www.w3.org/ns/prov#value | - for GC: chemically inert organic molecules having the same or different molecular weights including alkanes, alkenes, arenes, halocarbons, ethers, alcohols, silanes, thioethers, etc., particularly halogenated compounds, with or without other functionalities, for electron capture detection or mass spectroscopy detection (MS) with capillary GC separation, and for compound with elements not normally
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