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Issue 12, 2005
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Micro gas analysis system for measurement of atmospheric hydrogen sulfide and sulfur dioxide

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Abstract

A honeycomb structure microchannel scrubber was developed to achieve efficient and stable gas collection. A thin porous membrane was pasted on a microchannel by the adhesive force of a fresh polydimethylsiloxane surface. The microchannel scrubber achieved much more efficient gas collection than conventional impingers and diffusion scrubbers. Two sets of the microchannel scrubbers and detectors were integrated in a 10 cm × 9 cm plastic board to create a micro gas analysis system (μGAS) for simultaneous measurements of H2S and SO2. The whole system including a battery was incorporated in a carrying case 34 cm W × 16 cm D × 17 cm H for use in the field. Liquid flows at 30 µl min−1 were obtained by bimetal micropumps. The estimated detection limits were 0.1 ppbv for H2S and 1 ppbv for SO2. The system was demonstrated for real atmospheric gas analysis, and the results agreed well with data concurrently obtained by ion chromatography coupled with a cylindrical diffusion scrubber. The system we developed allowed automated continuous analyses in the field and achieved a much higher time resolution compared to those by ion chromatographic analysis.

Graphical abstract: Micro gas analysis system for measurement of atmospheric hydrogen sulfide and sulfur dioxide

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Publication details

The article was received on 08 Aug 2005, accepted on 11 Oct 2005 and first published on 02 Nov 2005


Article type: Paper
DOI: 10.1039/B511281H
Citation: Lab Chip, 2005,5, 1374-1379
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    Micro gas analysis system for measurement of atmospheric hydrogen sulfide and sulfur dioxide

    S. Ohira and K. Toda, Lab Chip, 2005, 5, 1374
    DOI: 10.1039/B511281H

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