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Chromatographic techniques for the determination of free phenol in foundry resins
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Orientador(es)
Resumo(s)
Phenol is a toxic compound present in a wide variety of foundry resins. Its quantification
is important for the characterization of the resins as well as for the evaluation
of free contaminants present in foundry wastes. Two chromatographic methods, liquid
chromatography with ultraviolet detection (LC-UV) and gas chromatography with flame
ionization detection (GC-FID), for the analysis of free phenol in several foundry resins,
after a simple extraction procedure (30 min), were developed. Both chromatographic
methods were suitable for the determination of phenol in the studied furanic and phenolic
resins, showing good selectivity, accuracy (recovery 99–100%; relative deviations
<5%), and precision (coefficients of variation <6%). The used ASTM reference
method was only found to be useful in the analysis of phenolic resins, while the LC
and GC methods were applicable for all the studied resins. The developed methods
reduce the time of analysis from 3.5 hours to about 30 min and can readily be used
in routine quality control laboratories.
Descrição
Palavras-chave
Foundry resin Gas chromatography Liquid chromatography Phenol
Contexto Educativo
Citação
Editora
Taylor & Francis