The liquid—liquid extraction of platinum in the presence of tin(II) chloride from dilute hydrochloric acid into 4-methyl-2-pentanone |
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Authors: | Nazir Ahmed Klaus R Koch |
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Institution: | Department of Analytical Science, University of Cape Town, Rondebosch, Cape Town 7700 South Africa |
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Abstract: | The distribution of complexes of type Pt(SnCl3)nCl4?n]2? (n = 1–4) and Pt(SnCl3)5]3? between 1.5–3.5 M hydrochloric acid and 4-methyl-2-pentanone is discussed in detail. Platinum can be quantitatively extracted into the organic phase from hydrochloric acid solutions containing tin(II) chloride when the mole ratio Sn2+: Pt2+ > 5. In the presence of sufficient tin(II) chloride, the Pt(SnCl3)5]3? anion is the predominant species extracted into the organic phase. Similar results pertain to starting solutions of either Ptcl2?4 or PtCl2?6, although Pt4+ is rapidly reduced to Pt2+. Small amounts of Co2+, Ni2+, Fe3+ and Cu2+ do not interfere. |
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