| Type |
Article |
| Date |
2008-12 |
| Language |
English |
| Author(s) |
Donval Jean-Pierre1, Charlou Jean-Luc1, Lucas L.2 |
| Affiliation(s) |
1 : IFREMER, Ctr Brest, Dept Marine Geosci, Plouzane, France.
2 : Inst Univ Technol, Dept Mesures Phys, Lannion, France. |
| Source |
Chemometrics and Intelligent Laboratory Systems (0169-7439) (Elsevier), 2008-12 , Vol. 94 , N. 2 , P. 89-94 |
| DOI |
10.1016/j.chemolab.2008.06.010 |
| WOS© Times Cited |
8 |
| Keyword(s) |
Design of experiments, Headspace technique, Gas, Sediments |
| Abstract |
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. |
| Full Text |
| File |
Pages |
Size |
Access |
| publication-6235.pdf |
10 |
276 KB |
Open access |
|
