SORPTION-FLUORIMETRIC DETERMINATION
OF ALUMINIUM AND ZINC IN METAL-MATRIX AlSiC-BASED COMPOSITE MATERIALS 

Uskova Elena Nikolaevna, Candidate of chemical sciences, associate professor, sub-department of analytical
chemistry, Mordovia State University named after N. P. Ogarev (68 Bolshevistskaya street, Saransk, Russia), uskova-en@yandex.ru
Okina Ekaterina Viktorovna, Candidate of chemical sciences, associate professor, sub-department of analytical chemistry, Mordovia State University named after N. P. Ogarev (68 Bolshevistskaya street, Saransk, Russia), aka22@yandex.ru
Tanaseychuk Boris Sergeevich, Doctor of chemical sciences, professor, sub-department of analytical chemistry, Mordovia State University named after N. P. Ogarev (68 Bolshevistskaya street, Saransk, Russia), inst-phys-chem@adm.mrsu.ru
Epifanova Natal'ya Anatol'evna, Candidate of technical sciences, associate professor, sub-department of analytical chemistry, Mordovia State University named after N. P. Ogarev (68 Bolshevistskaya street, Saransk, Russia), epifanovana@mail.ru
Nishchev Konstantin Nikolaevich, Candidate of physical and mathematical sciences, associate professor, head of the Institute of physics and chemistry, Mordovia State University named after N. P. Ogarev (68 Bolshevistskaya street, Saransk, Russia), inst-phys-chem@adm.mrsu.ru 

543.426:543.544-414.7

Background. Aluminum is one of the main components of AlSiC-based metal-matrix composite materials. Zink, along with many other microcomponents, is injected in the form of impurities with silumin component of the composite. That is why developing express and precise methods of determining macro- and microcomponents
without prior separation is a relevant analytical task.
Materials and methods. We used Silohrom С-60 with immobilized groups of 4,5-diphenyl-2-(2-hydroxyphenyl) imidazole as a modified sorbent obtained by the method of impregnation. Then we applied a set of physical and chemical methods of analysis to study the properties of the obtained material. The CHNSCl - Analyzer «Vario Micro Cube» (Elementar) was used to confirm the structure of еlements and the bruttoformula of synthesized reagent. We diagnosed the absorption spectrum using the UV-1800 Spectrophotometer (SHIMADZU) in the wavelength range from 200 to 350 nm. The pH of solutions was measured using the pH-Ionometer «ANION 4154» with pH-sensitive glass electrode ECL-003. IR-spectra of the modified sorbent were scanned using the Fourier Spectrometer INFRALUM FT-02. The signal of atomic absorption was measured using the atomic absorption spectrophotometer AA-7000 (SHIMADZU) in a flameless mode. The fluorescence spectra were obtained using RF-5301 Spectrofluorimeter SHIMADZU. The study of the modified sorbent surface structure was carried out on a scanning electron microscope Quanta 200i 3D with an increase from 100 to 6000 times.
Results. The conditions of the complexation of 4,5-diphenyl-2-(2-hydroxyphenyl)imidazole with ions of aluminum(III) and zinc(II) in solutions were determined. We obtained the spectra of absorption of reagent and its complexes with metals. It was found out that 4,5-diphenyl-2-(2-hydroxyphenyl) imidazole in the sorbent phase interacts with ions of Al(III) and Zn(II) and forms stable complexes. The optimum conditions of sorption for all the metals were found. It was shown that the fluorescent complexes of Al-Im (λ = 440 nm), Zn-Im (λ = 455 nm) are formed in the process of sorption on the surface of the modified sorbents with the groups of 4,5-diphenyl-2-(2-hydroxyphenyl)imidazole. The method of Sorption-Fluorimetric Determination of zinc(II) in AlSiC-based Metalmatrix Composite Materials was established. The correctness of this method was confirmed by the «Put-Found» method and by comparing the results with the results of the Atomic Absorption Spectroscopy method.
Conclusions. The method of Sorption - Fluorimetric Determination of aluminium and zinc can be successfully used for determination of macro- and microquantity of metals in multicomponent objects. 

non-covalent immobilization, sorption, sorption-fluorimetric method, aluminum(III), zinc(II), metal-matrix composite materials. 

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