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MEASUREMENT OF MASS CONCENTRATION OF CADMIUM IN TECHNOLOGICAL SOLUTIONS OF CCP PROCESSING

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Background. In the production of acetaldehyde, Navoiazot JSC uses the “Cadmium Calcium Phosphate Catalyst (CCP-N)” TU113-03-00209510-108-2006, whose service life is 6 months. A technology has been developed for the processing of spent CCP-N catalyst with the return of cadmium to a new cycle of its synthesis. To ensure its analytical control, an express and accurate method for the analysis of cadmium in technological solutions at different stages of this process is required. Purpose: development of methods for analytical control of the process of regeneration (recycling) of cadmium from spent CCP catalyst. Methodology. The mass concentration of cadmium was determined by voltammetry on a rotating glass fiber cathode with a mercury amalgam (polarograph ABC-1.1) and atomic absorption (PEAAnalyst 200). Originality. A technique has been developed for determining the cadmium content in technological solutions for processing spent CCP-N catalyst using amalgam polarography with accumulation as an alternative method for determining cadmium, a fiery version of atomic absorption spectroscopy is proposed. Findings. When processing the catalyst CCP-N, the resulting cadmium-containing technological solutions are mother liquors (after separation of calcium and cadmium); the solutions before and after sorption of cadmium are precisely controlled by polarography, which is confirmed by the data of their adsorptionspectrophotometric determination.Highlights: - voltammetry for the determination of cadmium; - Cd analysis on an ABC-1.1 polarograph and an AAnalyst 200 spectrometer

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# катализатор# catalyst# кадмий# cadmium# эритма# маточный раствор# атомно-абсорбционный спектрометр# атом-абсорбцион спектрофотометр# mother liquor# atomic absorption spectrometer

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https://eroi.uz/11.0030/A1021-0007

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