| prov:value
| - The following, for example, are suitable for this purpose: aromatic, hydrocarbons such as benzene, toluene, ligroins, halogenated hydrocarbons,chlorobenzene, polychlorobenzenes, bromobenzene, chlorinated alkanes having 1 to 3 carbon atoms; ethers such as dioxane, tetrahydrofuran; esters such as ethyl acetate; ketones such as acetone, methyl ethyl ketone, diethyl ketone, nitriles, e.g.acetonitrile,
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