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Development and application of a gas chromatography method for simultaneously measuring H 2 and CH 4 in hydrothermal plume samples
Author(s) -
Wang Hu,
Zhou Huaiyang,
Yang Qunhui,
Lilley Marvin D.,
Wu Jialin,
Ji Fuwu
Publication year - 2015
Publication title -
limnology and oceanography: methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.898
H-Index - 72
ISSN - 1541-5856
DOI - 10.1002/lom3.10061
Subject(s) - hydrothermal circulation , gas chromatography , seawater , flame ionization detector , helium , analytical chemistry (journal) , chromatography , chemistry , methane , detector , helium ionization detector , ionization , geology , physics , optics , ion , oceanography , organic chemistry , seismology
A robust, simple and efficient gas chromatography (GC) method is presented for determining H 2 and CH 4 concentrations simultaneously in water samples. The GC system consists of one detector (pulsed discharge helium ionization detector—PDHID), two columns in two ovens, respectively, and two 2‐position‐6‐port purge valves. In this method, H 2 and CH 4 in water samples were first extracted into the headspace of syringes, then injected into the GC system. Both H 2 and CH 4 were detected by a PDHID. The separation of CH 4 from O 2 and N 2 in seawater is achieved by switching the O 2 and N 2 out of the carrier gas flow at the appropriate time window. H 2 and CH 4 concentrations in water samples collected from hydrothermal plumes at the Southwest Indian Ridge were determined successfully using this method.