Open AccessDevelopment of a spectrophotometric method for determination of ions Cu (II) C N- (2-hydroxybenzoyl) -N '- (p-tosil)hydrazine in ammonia media
Author(s) -
Yulia B. Elchishcheva,
Ksenia S. Gorbunova,
П. Т. Павлов
Publication year - 2021
Publication title -
vestnik permskogo universiteta. seriâ himiâ
Language(s) - English
Resource type - Journals
ISSN - 2223-1838
DOI - 10.17072/2223-1838-2021-2-103-113
Subject(s) - chemistry , reagent , titration , ion , ammonia , molar absorptivity , analytical chemistry (journal) , spectrophotometry , stability constants of complexes , absorption (acoustics) , inorganic chemistry , chromatography , materials science , physics , organic chemistry , optics , composite material
A spectrophotometric method for the determination of Cu (II) ions with N- (2-hydroxybenzoyl) -N '- (p-tosyl) hydrazine (GBSH) in ammonia media has been developed. The optimal conditions for the formation of a complex compound are found: the wavelength of maximum light absorption; pH complexation; optimal time for color development; the amount of photometric reagent. Under optimal conditions of complexation of GBSG with Cu (Ⅱ) ions (λ = 401 nm, pH = 9.2, τ = 30 minutes, VGBSG = 3.75 ml), a calibration graph is constructed. The Bouguer-Lambert-Beer law is fulfilled in the range from 0.13 to 1.59 mg Cu (II) / 25 ml. The true molar light absorption coefficient of the complex compound of HBSG with Cu (Ⅱ) ions in the ammonia medium was 1480. The molar ratios in the solution of the complex compound were determined by the methods of saturation, shift of equilibria and conductometric titration - [Cu (Ⅱ)]: [HBSG] = 1: 1. According to Babko's method, the conditional constant of stability of the GBSG complex with Cu (Ⅱ) ions was calculated and it was 4.4 × 1010. The reproducibility and relative error of the developed photometric technique were determined by the method of mathematical statistics.