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https://repositorio.ufba.br/handle/ri/7392
metadata.dc.type: | Artigo de Periódico |
Título : | Chromium(III) determination with 1,5-diphenylcarbazide based on the oxidative effect of chlorine radicals generated from ccl4 sonolysis in aqueous solution |
Otros títulos : | Analytical Sciences |
Autor : | Borges, Sivanildo da Silva Korn, Mauro Lima, José Luis Fontes da Costa |
metadata.dc.creator: | Borges, Sivanildo da Silva Korn, Mauro Lima, José Luis Fontes da Costa |
Resumen : | 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. |
URI : | http://www.repositorio.ufba.br/ri/handle/ri/7392 |
Fecha de publicación : | dic-2002 |
Aparece en las colecciones: | Artigo Publicado em Periódico (Química) |
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