| http://www.w3.org/ns/prov#value | - Also, for example, the heated HPM (HCl/H.sub.2 O.sub.2), SPM (H.sub.2 SO.sub.4 +H.sub.2 O.sub.2) and aqua regia (HCl+HNO.sub.3) are used to remove difficult to ionize heavy metals such as Fe, Cu, Au and Al, however, the formation of oxidation
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