Сборник V международной

SORPTION-PHOTOMETRIC DETERMINATION OF COBALT IONS BY 
IMMOBILIZED NITROSONAPHTHOL DERIVATIVES
Khalilova L.M., Dolieva K., Smanova Z.A.
Mirzo Ulugbek National University o f Uzbekistan 
e-mail: [e-mail]; тел.[phone]
Relevance. In order to improve the quality control system of medicines on a global scale, much at­
tention is paid to research, which is primarily carried out to control the quality o f medicines at each stage 
of their production. In this regard, it is important to conduct scientific research aimed at creating a clear, 
renewable and fast, easy-to-perform analysis of medicines and inexpensive methods o f analysis, with the 
help of which a comprehensive analysis of medicines is carried out.
Purpose: Immobilization o f nitrosonaphthol group reagents on polymer fibrous materials, develop­
ment o f express and sensitive methods for determination o f cobalt (II) ions with new immobilized organic 
reagents.
Materials and methods: sorption-photometric, reflective spectroscopy. The pH o f the solutions was 
monitored on the I-130 potentiometer. Absorption spectra were measured on a spectrophotometer SF-46, 
KFK-2 (l=1 cm), and reflection spectra on a two-beam recording spectrophotometer UV-ViS SPECORD 
M-40. IR spectra of reagents and immobilized carriers were recorded on the Avatar sustem 360 FT-IR 
spectrometer of the Nikolet Justrument Corporation (USA). Fibrous sorbents modified by various anion 
exchange groups were used as carriers for immobilization.
^ e results obtained: For the first time, the chemical and analytical properties of reagents o f the 
naphtholine phenol group reagents immobilized on carriers based on local, affordable and cheap raw mate­
rials were investigated. It is established that organic reagents after immobilization on polyacrylonitrile fiber 
retain their chemical and analytical properties. The conditions for the formation of metal complexes on a 
polyacrylonitrile matrix coincide with those of complexes obtained in solution, allowing the use of known 
analytical reagents and the revealed patterns of reactions in solution to create new optical chemical sensors 
based on a polyacrylonitrile matrix. Using fibrous ion-exchange carriers, it is possible to combine the selec­
tive concentration of the element being determined with the selectivity of its determination. The structure
90

---

o f the obtained reagents and their complexes were proved using IR and PMR spectra.
Conclusions: based on the proposed immobilized reagents, sorption spectroscopic methods for de­
termining copper in drinking and wastewater, industrial waste have been developed.