Sorption preconcentration and determination of cobalt in industrial solutions by diffuse reflection spectroscopy method


Тип публикации: статья из журнала

Год издания: 2000

Идентификатор DOI: 10.1002/1521-401X(200005)28:5<272::AID-AHEH272>3.0.CO;2-J

Ключевые слова: Cation Exchanger, Cobalt Ion, Concentration, Diffuse Reflection Spectroscopy, Sorption

Аннотация: Cobalt and its compounds have a broad field of application in Russian industries, being essential raw materials for metallurgy, medicine, and agriculture. That is why the production of cobalt is one of the key industries in Russia. Cobalt is produced from mineral raw materials as well as from secondary raw materials (for example, aПоказать полностьюfter processing of spent catalysts of oil refinery). It can also be obtained as a by-product of nickel, manganese, and some other metals processing. That is the reason why the solutions of Ni and Mn industries contain up to 50 g/L of cobalt. Cobalt compounds are harmful for men's heart, bloodvessel system, and thyroid gland. This fact explains the importance of the monitoring of cobalt concentrations in natural water and sewages. This task can be effectively achieved using the analytical sorption technique. The present work is focused on the preconcentration of cobalt and its determination by means of diffuse reflection spectroscopy. The preconcentration of cobalt was carried out using the macronetwork cation exchangers KB-2M and KB-2-3T synthesized on the basis of methyl acrylate and long-chain cross-linking agents copolymers. Based on these collectors, a cobalt determination method in industrial solutions was worked out using solid-phase spectroscopy. The colored surface compound to be determined was obtained by a preceding cobalt sorption on the resin and by subsequent treatment of the concentrate obtained with definite amount of nitroso-R-salt. The Co calibration curve is linear in the concentration range of 0.05...0.50 mg/L. Co (sample volume is 50.0 mL) and the detection limit is 0.02 mg/L (1 mug absolute).

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Выпуск журнала: Vol. 28, Is. 5

Номера страниц: 272-276

ISSN журнала: 03234320

Место издания: BERLIN