Gold, xanthate complexes

Mohamed, A.A., Kani, I., Ramirez, A.O. and Fackler, J.P. Jr (2004) Synthesis, characterization, and luminescent properties of dinuclear gold(I) xanthate complexes X-ray structure of [Au2(nBu-xanthate)2j. Inorganic Chemistry, 43, 3833-3839. 

If the alternative potassium hydroxide method is employed for the separation of Groups IIA and IIB, the KOH extract may contain As, Sb, Sn, Se, Te, and part of the Mo the residue may contain, in addition to HgS, PbS, Bi2S3, CuS, CdS, and PdS, the gold and platinum partly as sulphides and possibly partly in the form of the free metals. Mo is readily identified by the potassium xanthate or a-benzoin oxime test. The Au and Pt will accompany HgS after extraction with dilute nitric acid upon dissolution in aqua regia, Pt may be identified as the dimethylglyoxime complex in the presence of m hydrochloric acid after the Pb, Bi, Cu, and Cd have been removed. 

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