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Analysis of hydrogen and methane in seawater by “Headspace” method: Determination at trace level with an automatic headspace sampler
Provedor de dados: 5
Autores: Donval, Jean-pierre; Guyader, Vivien.
“Headspace” technique is one of the methods for the onboard measurement of hydrogen (H2) and methane (CH4) in deep seawater. Based on the principle of an automatic headspace commercial sampler, a specific device has been developed to automatically inject gas samples from 300 ml syringes (gas phase in equilibrium with seawater). As valves, micro pump, oven and detector are independent, a gas chromatograph is not necessary allowing a reduction of the weight and dimensions of the analytical system. The different steps from seawater sampling to gas injection are described. Accuracy of the method is checked by a comparison with the “purge and trap” technique. The detection limit is estimated to 0.3 nM for hydrogen and 0.1 nM for methane which is close to the...
Tipo: Text
Palavras-chave: Gas; Seawater; Headspace method.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00354/46523/46287.pdf