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A. N. Chebotarev, V. P. Dubovyiy D. V. Snigur

Sorption-spectrophotometric determination of bismuth(III) in ores and concentrates

Abstract

The conditions for the Bi(III) sorption from dilute aqueous solutions and its desorption from the silica L100/250 surface are optimized using the mathematical experiment planning by the Latin squares method. It was found that the sorption maximum degree (9598%) is reached at pH 4,5 near the zero charge point of the silica and the Bi(OH)3 monomeric hydroxoforms dominate in the solution. The sorption time does not exceed 30 min with a sorbent quantity of 0.4 g, and the maximum desorption is observed when Bi(III) eluting by 0.5 M nitric acid solution for 20 min. A sorption-spectroscopic technique for determination of Bi(III) with xylenol orange was developed. The calibration curve is linear in the concentration range 0.256.0 μg/ml, and the LOD and LOQ are respectively 0.09 and 0.28 μg/ml. The proposed method is tested on standard samples of tungsten ores and molybdenum concentrate, and the sr value does not exceed 0,04.
Key words: sorption, silica, spectrophotometry, bismuth (III), xylenol orange.
Moscow University Chemistry Bulletin.
2018, Vol. 59, No. 3, P. 212
   

Copyright (C) Chemistry Dept., Moscow State University, 2002
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