Estandarización de la difenilcarbazida como indicador y acomplejante en la identificación de cromo hexavalente – Cr (VI)
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Date
2013
Journal Title
Journal ISSN
Volume Title
Publisher
Corporación Universitaria Lasallista
Área Metropolitana del Valle de Aburrá
Área Metropolitana del Valle de Aburrá
Abstract
Introduction. The treatment of water polluted with metals has gained a great importance in history, as the
presence of such water not only generates a nasty visual impact, but also affects the ecosystems. One of the
most toxic and stable metals in solution is Cr (VI). Its identification and quantification are very important, and so
is its removal. Among the analysis techniques, colorimetry is one of the most economic and efficient to identify
this metallic ion in solution, thanks to the action of the 1,5-diphenylcarbazid, which allows an exact determination of its presence in solution. Objective. To establish the best conditions to implement 1,5- diphenylcarbazid
as a complexity agent to determine Cr (VI) in solution. materials and methods. The best work conditions
were assessed by elaborating the calibration curves, identification of extinction coefficients, effect of the dissolvent, detection-quantification limit and degradation kinetics, after the action of the complexity agent. The
determinations were performed with the UV- visible spectrophotometry technique. Results. The calibration
curves obtained satisfactory results (99.11 %, 97.35 % and 99.17 %) with 95 % of confidence. The detection limit
determined is 0.096 ppm and the quantification limit is 0.35 ppm. These results are very satisfactory, given the
sensibility of the technique. The effect of the dissolvent with acetone, methanol and ethanol showed small batochromic displacements and a good correlation. Conclusion. 1,5-diphenylcarbazid is an adequate complexity
agent to determine Cr (VI) in solution.
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Keywords
Corporación Universitaria Lasallista, Área Metropolitana del Valle de Aburrá, Difenilcarbazida, Cromo - Investigaciones, Tratamiento de aguas residuales, Contaminación por metales pesados