Study of the Optimal Parameters for the Formation of Selenium Complex With the (NEDA) N- (1-Naphthyl-Ethylenediamine Dihydrochloride) C_12 H_14 N_(2. 2) 〖HCl〗_ Reagent and Its Use for the Control of Selenium Microcapsules. TUJ-BA 2020, 42 (5).