Reagents and Materials.
Di(2-ethylhexyl) phosphoric acid (D2EHPA), purchased from Shanghai Laiyashi Chemical Co.
, Ltd., was used as the extractant without further purification.
Chloroform, toluene, n-hexane, cyclohexane, nonane, kerosene,dodecane, and trialkylphosphine oxide (TRPO) were used as diluents.
Poly(ethylene glycol) with average molecular weight 2000 (PEG) stock solution of 50% (w/v)
was prepared.
A series of (NH4)2SO4 stock solutions with different initial pH values (pHini) were prepared.
Two stock solutions of mixed Cr(III) and Cr(VI) were prepared with CrCl3 3 6H2O and K2CrO4.
One (Cr stock 1) contained 100 mmol 3 L1 Cr(III) and 50 mmol 3 L1 Cr(VI).
The other (Cr stock 2) contained 50 mmol 3 L1 Cr(III) and 50 mmol 3 L1 Cr(VI).
Solutions of 1 mol 3 L1H2SO4 or 1.5 mol 3 L1 NaOH were used for pH adjustment as appropriate.
All aqueous solutions were prepared using analytical reagent grade chemicals
(Sinopharm Chemical Reagent Co., Ltd.) and deionized water.
Reagents and Materials.
Di(2-ethylhexyl) phosphoric acid (D2EHPA), purchased from Shanghai Laiyashi Chemical Co.
, Ltd., was used as the extractant without further purification.
Chloroform, toluene, n-hexane, cyclohexane, nonane, kerosene,dodecane, and trialkylphosphine oxide (TRPO) were used as diluents.
Poly(ethylene glycol) with average molecular weight 2000 (PEG) stock solution of 50% (w/v)
was prepared.
A series of (NH4)2SO4 stock solutions with different initial pH values (pHini) were prepared.
Two stock solutions of mixed Cr(III) and Cr(VI) were prepared with CrCl3 3 6H2O and K2CrO4.
One (Cr stock 1) contained 100 mmol 3 L1 Cr(III) and 50 mmol 3 L1 Cr(VI).
The other (Cr stock 2) contained 50 mmol 3 L1 Cr(III) and 50 mmol 3 L1 Cr(VI).
Solutions of 1 mol 3 L1H2SO4 or 1.5 mol 3 L1 NaOH were used for pH adjustment as appropriate.
All aqueous solutions were prepared using analytical reagent grade chemicals
(Sinopharm Chemical Reagent Co., Ltd.) and deionized water.
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