| http://www.w3.org/ns/prov#value | - ex mixture of chemical constituents including various alkanes (butane, pentane, and hexane), aromatic hydrocarbons (benzene, ethyl benzene, toluene, and xylenes), cycloalkanes, other nitrogen, oxygen, and sulfur compounds (hydrogen sulfide) and trace metals such as iron, nickel, copper and vanadium.
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