A carregar...
Publicação
Determination of free formaldehyde in foundry resins as its 2,4-dinitrophenylhydrazone by liquid chromatography
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 78.6 KB | Adobe PDF |
Orientador(es)
Resumo(s)
Formaldehyde is a toxic component that is present in foundry resins. Its quantification is important to the characterisation of
the resin (kind and degradation) as well as for the evaluation of free contaminants present in wastes generated by the foundry
industry. The complexity of the matrices considered suggests the need for separative techniques. The method developed
for the identification and quantification of formaldehyde in foundry resins is based on the determination of free carbonyl
compounds by derivatization with 2,4-dinitrophenylhydrazine (DNPH), being adapted to the considered matrices using liquid
chromatography (LC) with UV detection. Formaldehyde determinations in several foundry resins gave precise results. Mean
recovery and R.S.D. were, respectively, >95 and 5%. Analyses by the hydroxylamine reference method gave comparable
results. Results showed that hydroxylamine reference method is applicable just for a specific kind of resin, while the developed
method has good performance for all studied resins.
Descrição
Palavras-chave
Foundry resins Formaldehyde 2,4-Dinitrophenylhydrazine Liquid chromatography
Contexto Educativo
Citação
Editora
Elsevier