Colorimetric Determination of Pb2+ in Perfect Aqueous Solution Using Carminic Acid as a Selective Chemosensor.
J Fluoresc
; 27(5): 1929-1935, 2017 Sep.
Article
em En
| MEDLINE
| ID: mdl-28634885
ABSTRACT
The commercially available natural organic dye, carminic acid (CA), an anthraquinone derivative bearing hydroxyl and carboxyl groups as recognition sites was found to be a colorimetric probe for Pb2+ in perfect aqueous solution under neutral conditions with specific selectivity and high sensitivity. Upon addition of Pb2+, the absorption maximum of CA showed a large red shift, and the resulted color change from red to purple could be easily identified even by the naked eye. The chemical stoichiometric ratio between CA and Pb2+ was determined to be 12 through Job plot, Pb2+ titration, and kinetic experiments. Moreover, other environmental relevant metal ions induced no or minimal spectral and color changes. The reversibility of Pb2+ to CA with EDTA even through several cycles was established for practical applications. The results indicated that CA can be a good candidate for simple, convenient and reversible colorimetric detection of Pb2+ in aqueous solution even though it was hard to be applied to determine Pb2+ on the water testing by US EPA.
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Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Água
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Técnicas Biossensoriais
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Carmim
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Colorimetria
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Corantes Fluorescentes
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Chumbo
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article