Abstract
The extraction of lanthanum to a W/O microemulsion by the sodium oleate(NaOL)/pentanol/heptane/NaCl microemulsion system was studied.The influence of extraction time,aqueous-microemulsion ratio,concentration of NaOL,concentration of cosurfactant,pH and salting-out agent on the extraction rate was investigated.The microemulsion system showed strong extractability and stability without extractant.The extraction rate(E%) can be more than 99.5% when the mass fraction of NaOL and pentanol are 6% and 32%,respectively,R= 7 and pH 3.5~7.
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