Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/2992
Título: Determination of free formaldehyde in foundry resins as its 2,4-dinitrophenylhydrazone by liquid chromatography
Autor: Oliva-Teles, Maria Teresa
Paíga, Paula
Delerue-Matos, Cristina
Alvim-Ferraz, Maria da Conceição M.
Palavras-chave: Foundry resins
Formaldehyde
2,4-Dinitrophenylhydrazine
Liquid chromatography
Data: 2002
Editora: Elsevier
Relatório da Série N.º: Analytica Chimica Acta; Vol.467, Issue 1-2
Resumo: 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.
Peer review: yes
URI: http://hdl.handle.net/10400.22/2992
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S0003267002001307#
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