A H2S microsensor for profiling biofilms and sediments: Application in an acidic lake sediment

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dc.contributor.author Kühl, M
dc.contributor.author Steuckart, C
dc.contributor.author Eickert, G
dc.contributor.author Jeroschewski, P
dc.date.accessioned 2011-02-07T06:20:41Z
dc.date.issued 1998
dc.identifier.citation Aquatic Microbial Ecology, 1998, 15 (2), pp. 201 - 209
dc.identifier.issn 0948-3055
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/13317
dc.description.abstract We developed a microsensor for the amperometric detection of dissolved hydrogen sulfide, H2S, in sediments and biofilms. The microsensor exhibits a fast (t90 <0.2 to 0.5 s) and linear response to H2S over a concentration range of 1 to >1000 μmol H2S l-1, and has a low stirring dependency of the microsensor signal (<1 to 2%). We used the new microsensor to obtain the first microprofiles of H2S in an acidic lake sediment with a several cm thick flocculant surface layer. Despite the low pH of 4.6, a relative low SO42- level in the lake water, and a broad O2 respiration zone of ca 6 mm, we were able to measure H2S depth profiles in the sediment at a good resolution, that allowed for calculation of specific sulfate reduction and H2S oxidation activities. Such calculations showed highest sulfate reduction activity in the anoxic sediment down to ca 20 mm depth. A comparison of calculated areal rates of O2 consumption and sulfate reduction indicated that sulfate reduction accounted for up to 13% of total organic carbon mineralization in the acidic sediment. All produced H2S was reoxidizecl aerobically with O2 at the oxic-anoxic interface. In addition to its good performance in acidic environments, the new H2S microsensor has proven useful for sulfide measurements in neutral and moderate alkaline (pH < 9) biofilms and sediments, and thus is a true alternative to the traditionally used potentiometric Ag/Ag2S microelectrode for most applications in aquatic ecology and biogeochemistry.
dc.language eng
dc.title A H2S microsensor for profiling biofilms and sediments: Application in an acidic lake sediment
dc.type Journal Article
dc.description.version Published
dc.parent Aquatic Microbial Ecology
dc.journal.volume 2
dc.journal.volume 15
dc.journal.number en_US
dc.publocation Oldendorf, Germany en_US
dc.identifier.startpage 201 en_US
dc.identifier.endpage 209 en_US
dc.cauo.name SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 0602 Ecology
dc.personcode 107129
dc.percentage 100 en_US
dc.classification.name Ecology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords Acidic sediment
dc.description.keywords Freshwater
dc.description.keywords Hydrogen sulfide
dc.description.keywords Microsensor
dc.description.keywords Sulfate reduction
dc.description.keywords Sulfide oxidation
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - C3
utslib.copyright.status Closed Access
utslib.copyright.date 2015-04-15 12:17:09.805752+10
pubs.consider-herdc false
utslib.collection.history Closed (ID: 3)
utslib.collection.history Uncategorised (ID: 363)

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