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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/7392

Title: Chromium(III) determination with 1,5-diphenylcarbazide based on the oxidative effect of chlorine radicals generated from ccl4 sonolysis in aqueous solution
Other Titles: Analytical Sciences
Authors: Borges, Sivanildo da Silva
Korn, Mauro
Lima, José Luis Fontes da Costa
Issue Date: Dec-2002
Abstract: Oxidation of Cr(III) during sonication in carbonated aqueous solutions saturated with CCl4 leads to the quantitative formation of Cr(VI) and provides a simple and rapid method for spectrophotometric chromium determination with 1,5-diphenylcarbazide. The key to this method is the production of chlorine radicals when aqueous solution saturated with CCl4 is exposed to ultrasonic waves of 40 kHz. The effects of sonication period, CCl4 solution volume, acidity, and interferences were discussed. The time required for a single determination is lower than 2 min. The relative standard deviation obtained for aqueous solutions with 1 µg of Cr was <2% (N = 10) and the calculated detection limit (3σ) was 5 ng of Cr.
Description: p. 1361-1366
URI: http://www.repositorio.ufba.br/ri/handle/ri/7392
ISSN: 0910-6340
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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