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Figure 2. Isothermal equilibrium curves of Se(IV) with different<br />

HNO 3 (M) and TBP-dodecane concentrations. Or/Aq phase ratio 1<br />

0.11<br />

0.10<br />

[H + ] aq 3M TBP 30%<br />

[Se(IV)]or (mg/L)<br />

0.09<br />

0.08<br />

0.07<br />

0.06<br />

0.05<br />

0.04<br />

0.03<br />

0.02<br />

0.01<br />

[H + ] aq 3M TBP 25%<br />

[H + ] aq 4M TBP 30%<br />

[H + ] aq 5M TBP 30%<br />

[H + ] aq 3M TBP 20%<br />

[H + ] aq 4M TBP 25%<br />

[H + ] aq 5M TBP 25%<br />

[H + ] aq 4M TBP 20%<br />

[H + ] aq 5M TBP 20%<br />

0.00<br />

0 5 10 15 20 25<br />

[Se(IV)] aq (mg/L)<br />

H + (M)<br />

Aq. phase<br />

Ratio<br />

Or/Aq<br />

Table 1. Distribution coefficients of Se(IV) by TBP 30%<br />

in dodecane. Initial Se(IV) concentration 20.4 mg/L.<br />

H + (M)<br />

Aq. phase<br />

U (g/L)<br />

Aq. phase<br />

U (g/L)<br />

Or.phase<br />

Steady state<br />

Se(IV)<br />

(mg/L)<br />

Aq. phase<br />

Se(IV)<br />

(mg/L)<br />

Or. phase<br />

Distribution<br />

coefficient<br />

(D)<br />

2.99 3 1.83 0 0 21.9 0.0977 4.46 E-3<br />

2.99 2 2.12 0 0 22.0 0.0882 4.04 E-3<br />

2.99 1 2.49 0 0 21.3 0.0733 3.44 E-3<br />

3.90 3 2.53 0 0 21.9 0.0683 3.12 E-3<br />

3.90 2 2.87 0 0 21.5 0.0563 2.62 E-3<br />

5.27 3 3.43 0 0 22.8 0.0488 2.14 E-3<br />

3.90 1 3.46 0 0 20.8 0.0450 2.16 E-3<br />

5.27 2 3.90 0 0 22.0 0.0376 1.71 E-3<br />

5.27 1 4.21 0 0 22.4 0.0296 1.32 E-3<br />

3.02 3 1.93 < 0.5 9 21.9 0.204 9.32 E-3<br />

3.00 3 1.92 1 17 21.6 0.348 1.61 E-2<br />

2.94 3 2.00 1 36 21.5 0.453 2.11 E-2<br />

3.14 3 2.24 1 52 22.4 0.178 7.96 E-3<br />

3.03 3 2.30 2 68 22.8 0.105 4.60 E-3<br />

3.07 3 2.47 6 83 23.4 0.0941 4.02 E-3<br />

3.10 3 2.55 35 125 21.7 0.0621 2.86 E-3<br />

3.09 3 2.60 170 138 22.2 0.0511 2.30 E-3<br />

619

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