Solvent extraction of Noble metals with derivatives of thioureaстатья
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Дата последнего поиска статьи во внешних источниках: 14 сентября 2013 г.
Аннотация:Studies on the use of diphenylthiourea, hexamethylene-N'-phenylurea, N,N-hexamethylene-N'-isohexylthiourea and di-tert-butylthiourea for extraction and group concentration of noble metals are reported. A preliminary treatment of solutions of the platinum metals with tin(II) chloride is useful in acceleration the reactions. The chemistry of the extraction and the properties of the extracted compounds are discussed. Hexamethylene-N'-phenylurea provides the best selectivity in the presence of copper, whereas the isohexylthiourea derivative provides the greatest solubility.