Data/hora: 09/06/2024 11:34:14

Provedor de dados: 	5	
País: 	France	
Título: 	Analysis of light hydrocarbons in marine sediments by headspace technique: Optimization using design of experiments	
Autores: 	Donval, Jean-pierre; Charlou, Jean-luc; Lucas, L.	
Data: 	2008-12	
Ano: 	2008	
Palavras-chave: 	Design of experiments; Headspace technique; Gas; Sediments.	
Resumo: 	Headspace technique is a common method to analyze light hydrocarbons in deep marine sediments. The use of an automatic headspace sampler instead of a manual injection is the guarantee for a better repeatability and furthermore it is less time consuming. But to increase the sensitivity and therefore, to achieve a better detection limit, it is necessary to optimize the automatic headspace sampler parameters. The theory of design of experiments was applied here by studying them. As a response, methane, which is an important gas in marine sediments, was chosen for its short analysis time. Regarding the parameters for automatic headspace sampler, eight variables were selected and then, a screening of them was carried out with a fractional factorial design to determine the influential factors. Finally, optimization was conducted with four factors: Sample Loop Fill time (t(slf)), Oven temperature (T degrees(o)), Vial Pressurization time (t(vp)) and Vial pressure (P-v). They were modeled with a Doehlert experimental design. Then, the model was validated by a conventional statistical test (analysis of variance) and the optimum has been found and checked by three experiments. Results on light hydrocarbons measured in sediments from the Congo-Angola Basin are given, as an example. (C) 2008 Elsevier B.V. All rights reserved.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/2008/publication-6235.pdf

DOI:10.1016/j.chemolab.2008.06.010	
Editor: 	Elsevier	
Relação: 	http://archimer.ifremer.fr/doc/00000/6235/	
Formato: 	application/pdf	
Fonte: 	Chemometrics and Intelligent Laboratory Systems (0169-7439) (Elsevier), 2008-12 , Vol. 94 , N. 2 , P. 89-94	
Fonte: 	2008 Elsevier B.V. All rights reserved.