The most prominent place in the list of isotopes of molybdenum is the 99Ìî isotope, it is the mother nucleus for 99mÒñ. The latter is widely used in modern medicine for radioisotope methods of diagnosis and treatment of cancer, which undoubtedly indicates the relevance of this research topic.
The method of supercritical fluid extraction by carbon dioxide of molybdenum complexes from nitric acid solutions was studied. The amount of molybdenum complex formed is about 5-7 % of the total molybdenum content in the nitric acid solution.
The method of supercritical fluid extraction by carbon dioxide of molybdenum complexes from nitric acid solutions was studied.
The conditions for extracting the molybdenum complex from the nitric acid solution by the method of supercritical fluid extraction are determined, the recovery percentage is about 90%.
It is determined that the dependence of the molybdenum content in the nitric acid solution on the dissolution time has a quasi-periodic nature (see Fig. 1).
Fig. 1 – Dependence of molybdenum content in 3.3 mol/l nitrate solution
It is found that when saturation of all Mo in the solution contained in the form of its various compounds failing white crystalline precipitate and a light yellow color, which suggests that the formation of a molybdenum monohydrate (Í2ÌîÎ4), molybdenum dihydrate (Í2ÌîÎ4⋅Í2Î) in a nitric acid solution, as well as nimolybdic acid (Í5ÌîÎ6). The presence of these chemical compounds made it possible to propose the following tritropical distribution of roles between them: the victim (monohydrate); predator (dihydrate), in which monohydrate is converted as a result of the addition of a water molecule; super-predator (supramolybdic acid), formed from a predator by the addition of hydroxyl group OH. Schematically, this tritrophic system is shown in Fig.2.
Fig. 2 – Tritrophic system for the formation of molybdic acids in a nitric acid solution
Analysis tritrophic numerical model indicates that its use to quantify the experimental data.