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Carrier-free  176,177 W and  99 Mo have been extracted from 0.1-5.0M nitric, phosphoric and sulphuric acids into 0.22M Aliquat 336, CH 3 NR 3 Cl, in toluene. Their extraction properties have been compared to hafnium, to the lanthanides lanthanum, cerium, thulium, ytterbium and lutetium, and to the actinides americium, curium, thorium and uranium. From nitric acid solutions the extracted species of tungsten and molybdenum at low concentrations are probably CH 3 NR 3 · HMO 4 , where M=Mo or W. At higher nitric acid concentrations the extracted species are most likely similar to those of uranium,  i.e . (CH 3 NR 3 ) 2 ·MO 2 (NO 3 ) 4  and possibly CH 3 NR 3 ·MO 2 (NO 3 ) 3 . For the extraction from phosphoric acid solutions the major extracted complex is most likely CH 3 NR 3 ·MO 2 (H 2 PO 4 ) 3 , while the minor extracted complex may be (CH 3 NR 3 ) 2 ·MO 2 (H 2 PO 4 ) 4  or even the more hydrolysed species CH 3 NR 3 ·HMO 4 . From sulphuric acid solutions the extraction of molybdenum and tungsten has similarity with the extraction of uranium and thorium, although the decrease with acid concentration is slower.

radiochimica acta

A comparision of the extraction of carrier-free  176,177 W and  99 Mo with that of U, Th, Am, Cm, La, Ce, Tm, Yb, Lu and Hf into Aliquat 336 in toluene from nitric, phosphoric, and sulphuric acid media