| http://www.w3.org/ns/prov#value | - Thus these spectroscopies canprovide information on certain molecules or molecular types, but they do not directly measure such properties as molecular weight or boiling point, nor are they sensitive to trace level elements such as metals (e.g. Ni, V or Fe) or trace level species(e.g. mercaptans).Therefore, predictions of the level of these properties, elements or compounds can be less accurate an
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