DC FieldValueLanguage
dc.contributor.authorAßmann, Steffen-
dc.contributor.authorFrank, Carsten-
dc.contributor.authorKörtzinger, Arne-
dc.date.accessioned2022-04-06T13:51:40Z-
dc.date.available2022-04-06T13:51:40Z-
dc.date.issued2011-10-04-
dc.identifier.issn1812-0792en_US
dc.identifier.urihttp://hdl.handle.net/20.500.12738/12885-
dc.description.abstractAutonomous sensors are required for a comprehensive documentation of the changes in the marine carbon system and thus to differentiate between its natural variability and anthropogenic impacts. Spectrophotometric determination of pH - a key variable of the seawater carbon system - is particularly suited to achieve precise and drift-free measurements. However, available spectrophotometric instruments are not suitable for integration into automated measurement systems (e.g. FerryBox) since they do not meet the major requirements of reliability, stability, robustness and moderate cost. Here we report on the development and testing of a∼new indicator-based pH sensor that meets all of these requirements. This sensor can withstand the rough conditions during long-term deployments on ships of opportunity and is applicable to the open ocean as well as to coastal waters with a complex matrix and highly variable conditions. The sensor uses a high resolution CCD spectrometer as detector connected via optical fibers to a custom-made cuvette designed to reduce the impact of air bubbles. The sample temperature can be precisely adjusted (25 °C± 0.006 °C) using computer-controlled power supplies and Peltier elements thus avoiding the widely used water bath. The overall setup achieves a measurement frequency of 1 min -1 with a precision of ±0.0007 pH units, an average offset of +0.0005 pH units to a reference system, and an offset of +0.0081 pH units to a certified standard buffer. Application of this sensor allows monitoring of seawater pH in autonomous underway systems, providing a key variable for characterization and understanding of the marine carbon system. © 2011 Author(s).en
dc.language.isoenen_US
dc.publisherCopernicus Publ.en_US
dc.relation.ispartofOcean scienceen_US
dc.subjectpHen_US
dc.subjectSeawateren_US
dc.subjectUSB Spectrometeren_US
dc.subject.ddc570: Biowissenschaften, Biologieen_US
dc.titleSpectrophotometric high-precision seawater pH determination for use in underway measuring systemsen
dc.typeArticleen_US
tuhh.container.endpage607en_US
tuhh.container.issue5en_US
tuhh.container.startpage597en_US
tuhh.container.volume7en_US
tuhh.oai.showtrueen_US
tuhh.publication.instituteHelmholtz-Zentrum Hereonen_US
tuhh.publisher.doi10.5194/os-7-597-2011-
tuhh.type.opus(wissenschaftlicher) Artikel-
dc.rights.cchttps://creativecommons.org/licenses/by/3.0/en_US
dc.type.casraiJournal Article-
dc.type.diniarticle-
dc.type.driverarticle-
dc.type.statusinfo:eu-repo/semantics/publishedVersionen_US
dcterms.DCMITypeText-
item.creatorGNDAßmann, Steffen-
item.creatorGNDFrank, Carsten-
item.creatorGNDKörtzinger, Arne-
item.fulltextNo Fulltext-
item.creatorOrcidAßmann, Steffen-
item.creatorOrcidFrank, Carsten-
item.creatorOrcidKörtzinger, Arne-
item.grantfulltextnone-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.openairecristypehttp://purl.org/coar/resource_type/c_6501-
item.openairetypeArticle-
crisitem.author.deptDepartment Umwelttechnik-
crisitem.author.orcid0000-0002-2146-0319-
crisitem.author.parentorgFakultät Life Sciences-
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