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A novel cloud point extraction (CPE) procedure was developed to preenrich Th 4+  and UO 2  2+  by oil-in-water (O/W) microemulsion. Coupling CPE to ICP-MS, the separation and analysis were achieved at a trace level, in which the low detection limits were 0.019 and 0.042 ng mL −1  for Th(IV) and U(VI), respectively.  N , N ′-diethyl- N , N ′-ditolyl-2,9-diamide-1,10-phenanthroline (Et-Tol-DAPhen), as an extremely hydrophobic extractant, was failed to dissolve in single or mixed micelles, but was successfully solubilized to CPE system owing to O/W microemulsion. The extraction efficiency and selectivity for Th 4+  and UO 2  2+  were excellent under acidic condition of 1.0 mol L −1  HNO 3 , and the recovery of ultra-trace Th 4+  and UO 2  2+  was almost 100% even at the presence of large amounts of lanthanides, exhibiting high tolerance limits for lanthanides. The solubilization, extraction and coordination behaviours were studied systematically via DLS, UV–vis,  1 H NMR and FT-IR. Moreover, the solubilization of  N , N ′-dioctyl- N , N ′-dioctyl-2,9-diamide-1,10-phenanthroline (Oct-Oct-DAPhen) and efficient extraction for UO 2  2+  were also realized by O/W microemulsion, which further proved the feasibility of the method.

A novel CPE procedure by oil-in-water microemulsion for preconcentrating and analyzing thorium and uranium