Abstract
Abstract By employing the synergistic extraction technique, vanadium (V,IV) has been found to form the primary dithizonate in the presence of a synergist. The extraction of the element proceeds according to the following equations. VO2++H2dz,org+TBPOorg\ightleftharpoonsVO2(Hdz)(TBPO)Org+H+, and VOOH++H2dz,org\ightleftharpoonsTOPOorg\ightleftharpoonsVOOH(Hdz)(TOPO)org+H+, where H2dz, TBPO, and TOPO denote dithizone, tributylphosphine oxide and trioctylphosphine oxide, respectively, and the subscript org indicates the benzene phase. The resulting adduct VO2(Hdz)(TBPO) has an absorption maximum at 503 nm and is stable for at least 1 h. However, the red color of VOOH(Hdz)(TOPO) in benzene fades away during the standing time, probably due to the dimerization of the initially extracted monomeric species.
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