Fluorescent Detection of 2,4-DNT and 2,4,6-TNT in Aqueous Media by Using Simple Water-Soluble Pyrene Derivatives.
Chem Asian J
; 11(5): 775-81, 2016 Mar 04.
Article
em En
| MEDLINE
| ID: mdl-26757403
ABSTRACT
Pyrene-containing water-soluble probes for the fluorescent detection of nitroaromatic compounds (NACs), such as explosive components (2,4-DNT and 2,4,6-TNT) and herbicides (2,4-dinitrocresol, 2,4-DNOC), in aqueous media are reported. In the probes, the introduction of surface-active hydrophilic "heads" at the periphery of lipophilic (i.e., hydrophobic) pyrene "tails" resulted in the formation of highly fluorescent micelle-like aggregates/pre-associates in aqueous solutions at concentrations of ≤10(-5) m. The enhanced fluorescence quenching of the herein reported architectures is achieved in the presence of ultra-trace amounts of TNT or 2,4-DNT with values of Stern-Volmer quenching constant close to 1×10(5) m(-1) and a detection limit as low as 182â
ppb. The most hydrophilic probes demonstrated higher response to 2,4-DNT over TNT. Filter paper test strips impregnated with 1×10(-5) m solutions of the probes were able to detect TNT, 2,4-DNT, and other NACs at levels as low as 50â
ppb in water.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Pirenos
/
Poluentes Químicos da Água
/
Trinitrotolueno
/
Dinitrobenzenos
/
Substâncias Explosivas
/
Corantes Fluorescentes
/
Herbicidas
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Revista:
Chem Asian J
Ano de publicação:
2016
Tipo de documento:
Article