Antimony complexes cupferron

Antimony was also extracted as the complex with cupferron [12] or BPHA [13]. Sb(III) and As(in) can be extracted with bis(2-ethylhexyl)dithiophosphoric acid (0.1 M) in heptane from 2-4 M HCl in the presence of iodide. Only Sb(III) is re-extracted with 12 M HCl [14]. The reagent has been applied for isolation of Sb in partition chromatography [15]. Also diethyldithiophosphoric acid has been recommended for the separation of Sb(III) and As(III) [16]. In the presence of Bi and Sn, antimony was determined after extraction (CHCI3) with cyclic thiourea derivatives [17]. Sb(III) was also extracted with the use of the crown ether 18-crown-6 [18]. 

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