Response surface optimisation applied to a headspace-solid phase microextraction-gas chromatography-mass spectrometry method for the analysis of volatile organic compounds in water matrices

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

Vera Homem (Autor) FEUP; Raquel Sousa (Autor) FEUP; José Luís Moreira (Autor) FEUP; Lúcia Santos (Autor) FEUP; Arminda Alves (Autor) FEUP

Revista

Título: International Journal of Environmental Analytical Chemistry

Vol. 92 Nº 2

Páginas: 166-189

ISSN: 0306-7319

Editora: Taylor & Francis

Indexação

ISI Web of Knowledge - 2 Citações

ISI Web of Science

Scopus - 6 Citações

COMPENDEX

Classificação Científica

FOS: Ciências exactas e naturais > Química

Projetos Associados

PEst-C/EQB/UI0511/2011 - PROJECTO ESTRATÉGICO - UI 511 - 2011-2012

Outras Informações

ID Authenticus: P-002-HDJ

DOI: 10.1080/03067319.2010.536228

Abstract (EN): A new method for the simultaneous determination of 12 volatile organic compounds (trans-1,2-dichloroethene, 1,1,1-trichloroethane, benzene, 1,2-dichloroethane, trichloroethene, toluene, 1,1,2-trichloroethane, tetrachloroethene, ethylbenzene, m-, p-, o-xylene) in water samples by headspace solid phase microextraction (HS-SPME)-gas chromatography mass spectrometry (GC-MS) was described, using a 100 mm PDMS (polydimethylsiloxane) coated fibre. The response surface methodology was used to optimise the effect of the extraction time and temperature, as well as the influence of the salt addition in the extraction process. Optimal conditions were extraction time and temperature of 30 min and -20 degrees C, respectively, and NaCl concentration of 4 mol L(-1). The detection limits were in the range of 1.1 x 10(-3)-2.3 mu g L(-1) for the 12 volatile organic compounds (VOCs). Global uncertainties were in the range of 4-68%, when concentrations decrease from 250 mu g L(-1) down to the limits of quantification. The method proved adequate to detect VOCs in six river samples.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 24