Deutsch
 
Datenschutzhinweis Impressum
  DetailsucheBrowse

Datensatz

 
 
DownloadE-Mail
  MeasuringpHin low ionic strength glacial meltwaters using ion selective field effect transistor (ISFET) technology

Bagshaw, E. A., Wadham, J. L., Tranter, M., Beaton, A. D., Hawkings, J., Lamarche‐Gagnon, G., Mowlem, M. C. (2021): MeasuringpHin low ionic strength glacial meltwaters using ion selective field effect transistor (ISFET) technology. - Limnology and Oceanography - Methods, 19, 3, 222-233.
https://doi.org/10.1002/lom3.10416

Item is

Dateien

einblenden: Dateien
ausblenden: Dateien
:
5006542.pdf (Verlagsversion), 3MB
Name:
5006542.pdf
Beschreibung:
-
Sichtbarkeit:
Öffentlich
MIME-Typ / Prüfsumme:
application/pdf / [MD5]
Technische Metadaten:
Copyright Datum:
-
Copyright Info:
-

Externe Referenzen

einblenden:

Urheber

einblenden:
ausblenden:
 Urheber:
Bagshaw, Elizabeth A.1, Autor
Wadham, Jemma L.1, Autor
Tranter, Martyn1, Autor
Beaton, Alexander D.1, Autor
Hawkings, Jonathan2, Autor              
Lamarche‐Gagnon, Guillaume1, Autor
Mowlem, Matthew C.1, Autor
Affiliations:
1External Organizations, ou_persistent22              
23.5 Interface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_754888              

Inhalt

einblenden:
ausblenden:
Schlagwörter: -
 Zusammenfassung: Measuring pH in glacial meltwaters is challenging, because they are cold, remote, subject to freeze‐thaw cycles and have low ionic strength. Traditional methods often perform poorly there; glass electrodes have high drift and long response times, and spectrophotometric techniques are unpractical in cold, remote environments. Ion selective field effect transistor (ISFET) sensors are a promising alternative, proven in marine and industrial applications. We assess the suitability of two models of ISFET, the Honeywell Durafet and Campbell Scientific Sentron, for use in glacial melt through a series of lab and field experiments. The sensors have excellent tolerance of freeze‐thaw and minimal long‐term drift, with the Durafet experiencing less drift than the Sentron model. They have predictable response to temperature, although the Durafet housing causes some lag during rapid cycling, and the impact of stirring is an order of magnitude less than that of glass electrodes. At low ionic strength (< 1 mmol L−1), there is measurable error, but this is quantifiable, and less than glass electrodes. Field tests demonstrated low battery consumption, excellent longevity and resistance to extreme conditions, and revealed biogeochemical processes that were unlikely to be recorded by standard methods. Meltwater pH in two glacial catchments in Greenland remained > 7 with consistent diurnal cycles from the very first meltwater flows. We recommend that ISFET sensors are used to assess the pH of glacial meltwater, since their tolerance is significantly better than alternative methods: the Durafet is accurate to ± 0.2 pH when waters are > 1 mmol L−1 ionic strength, and ± 0.3 pH at < 1 mmol L−1.

Details

einblenden:
ausblenden:
Sprache(n):
 Datum: 2021-01-272021
 Publikationsstatus: Final veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1002/lom3.10416
GFZPOF: p4 T5 Future Landscapes
OATYPE: Hybrid Open Access
 Art des Abschluß: -

Veranstaltung

einblenden:

Entscheidung

einblenden:

Projektinformation

einblenden:

Quelle 1

einblenden:
ausblenden:
Titel: Limnology and Oceanography - Methods
Genre der Quelle: Zeitschrift, SCI, Scopus
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 19 (3) Artikelnummer: - Start- / Endseite: 222 - 233 Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals326
Publisher: Wiley