Aqueous to organic volume ratio Percentage extraction (% E) Distribution ratio (D) 10:10 100 ∞ 20:10 100 ∞ 25:10* 100 ∞ 30:10 100 ∞ 35:10 100 ∞ 40:10 100 ∞ 50:10 94.6 43.79 75:10 74.1 7.15 100:10 59.4 3.65 *Recommended for general extraction procedure Pt(IV)=150 μg, Aq: Org = 2.5: 1 pH=0.50, Ascorbic acid=0.01 M Equilibrium time=3 min, n-octylaniline=0.1 M in toluene

Table 3: Extraction of platinum (IV) as a function of aqueous to organic volume ratio.