Abstract
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.
Highlights
DEVELOPMENT OF A SPECTROPHOTOMETRIC METHOD FOR DETERMINATION OF IONS Cu (II) WITH N- (2-HYDROXYBENZOYL) -N '- (p-TOSIL) HYDRAZINE IN AMMONIA MEDIA
The Bouguer-Lambert-Beer law is fulfilled in the range from 0.13 to 1.59 mg Cu (II) / 25 ml
The convergence and correctness of the developed spectrophotometric technique were determined by the method of mathematical statistics
Summary
РАЗРАБОТКА СПЕКТРОФОТОМЕТРИЧЕСКОЙ МЕТОДИКИ ОПРЕДЕЛЕНИЯ ИОНОВ Cu(II) C N-(2-ГИДРОКСИБЕНЗОИЛ)-N'-(п-ТОЗИЛ)ГИДРАЗИНОМ В АММИАЧНЫХ СРЕДАХ. Сдвига равновесий и кондуктометрического титрования определены молярные соотношения в растворе комплексного соединения [Cu(II)]:[ГБСГ] = 1:1. С сотрудниками изучены процессы комплексообразования N-ацил-N'-(птолуолсульфонил)гидразинов с общей формулой RC(O)NHNHSO2C6H4(CH3), где R = С4H9, C6H13, С4H9CH(C2H5), С8H15, С10H21, C12H25, с ионами Cu (II), Co (II), Ni (II), Zn (II), Cd (II), Ag (I) в аммиачных средах [2]. Образуемых АСГ с ионами металлов в аммиачных средах, изучали методами насыщения, изомолярных серий и кондуктометрии. Сдвига равновесий, пересечения кривых, а также кондуктометрического титрования в растворе найдены соотношения в комплексах [Cu (II)] : [НППТ]=. В аммиачной среде с целью определения возможности применения реагента в процессах концентрирования цветных металлов, а в частности разработки методики для определения ионов Cu (II) в продуктах после флотационного обогащения
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