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  1. Article ; Online: Exploring Ocean Biogeochemistry Using a Lab-on-Chip Phosphate Analyser on an Underwater Glider

    Antony J. Birchill / A. D. Beaton / Tom Hull / Jan Kaiser / Matt Mowlem / R. Pascal / A. Schaap / Yoana G. Voynova / C. Williams / M. Palmer

    Frontiers in Marine Science, Vol

    2021  Volume 8

    Abstract: The ability to make measurements of phosphate (PO43–) concentrations at temporal and spatial scales beyond those offered by shipboard observations offers new opportunities for investigations of the marine phosphorus cycle. We here report the first in ... ...

    Abstract The ability to make measurements of phosphate (PO43–) concentrations at temporal and spatial scales beyond those offered by shipboard observations offers new opportunities for investigations of the marine phosphorus cycle. We here report the first in situ PO43– dataset from an underwater glider (Kongsberg Seaglider) equipped with a PO43– Lab-on-Chip (LoC) analyser. Over 44 days, a 120 km transect was conducted in the northern North Sea during late summer (August and September). Surface depletion of PO43– (<0.2 μM) was observed above a seasonal thermocline, with elevated, but variable concentrations within the bottom layer (0.30–0.65 μM). Part of the variability in the bottom layer is attributed to the regional circulation and across shelf exchange, with the highest PO43– concentrations being associated with elevated salinities in northernmost regions, consistent with nutrient rich North Atlantic water intruding onto the shelf. Our study represents a significant step forward in autonomous underwater vehicle sensor capabilities and presents new capability to extend research into the marine phosphorous cycle and, when combined with other recent LoC developments, nutrient stoichiometry.
    Keywords Seaglider observations ; phosphate ; lab on a chip (LoC) ; North Sea ; shelf sea biogeochemistry ; autonomous and remotely operated underwater vehicle ; Science ; Q ; General. Including nature conservation ; geographical distribution ; QH1-199.5
    Subject code 551
    Language English
    Publishing date 2021-07-01T00:00:00Z
    Publisher Frontiers Media S.A.
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Industry Partnership

    Matt Mowlem / Alexander Beaton / Robin Pascal / Allison Schaap / Socratis Loucaides / Sam Monk / Andrew Morris / Christopher L. Cardwell / Sara E. Fowell / Matthew D. Patey / Patricia López-García

    Frontiers in Marine Science, Vol

    Lab on Chip Chemical Sensor Technology for Ocean Observing

    2021  Volume 8

    Abstract: We introduce for the first time a new product line able to make high accuracy measurements of a number of water chemistry parameters in situ: i.e., submerged in the environment including in the deep sea (to 6,000 m). This product is based on the ... ...

    Abstract We introduce for the first time a new product line able to make high accuracy measurements of a number of water chemistry parameters in situ: i.e., submerged in the environment including in the deep sea (to 6,000 m). This product is based on the developments of in situ lab on chip technology at the National Oceanography Centre (NOC), and the University of Southampton and is produced under license by Clearwater Sensors Ltd., a start-up and industrial partner in bringing this technology to global availability and further developing its potential. The technology has already been deployed by the NOC, and with their partners worldwide over 200 times including to depths of ∼4,800 m, in turbid estuaries and rivers, and for up to a year in seasonally ice-covered regions of the arctic. The technology is capable of making accurate determinations of chemical and biological parameters that require reagents and which produce an electrical, absorbance, fluorescence, or luminescence signal. As such it is suitable for a wide range of environmental measurements. Whilst further parameters are in development across this partnership, Nitrate, Nitrite, Phosphate, Silicate, Iron, and pH sensors are currently available commercially. Theses sensors use microfluidics and optics combined in an optofluidic chip with electromechanical valves and pumps mounted upon it to mix water samples with reagents and measure the optical response. An overview of the sensors and the underlying components and technologies is given together with examples of deployments and integrations with observing platforms such as gliders, autonomous underwater vehicles and moorings.
    Keywords submersible ; autonomous ; in situ ; lab on chip ; microfluidics ; analytical chemistry ; Science ; Q ; General. Including nature conservation ; geographical distribution ; QH1-199.5
    Subject code 620
    Language English
    Publishing date 2021-10-01T00:00:00Z
    Publisher Frontiers Media S.A.
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  3. Article ; Online: Chemical sensors for in situ data collection in the cryosphere

    Elizabeth A. Bagshaw / Alexander Beaton / Jemma L. Wadham / Matt Mowlem / Jonathan Hawkings / Martyn Tranter

    TrAC Trends in Analytical Chemistry

    2016  

    Publishing country de
    Document type Article ; Online
    DOI 10.1016/j.trac.2016.06.016
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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    Inter-library loan at ZB MED

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  4. Article: Chemical sensors for in situ data collection in the cryosphere

    Bagshaw, Elizabeth A / Alexander Beaton / Jemma L. Wadham / Jon R. Hawkings / Martyn Tranter / Matt Mowlem

    Trends in analytical chemistry. 2016 Sept., v. 82

    2016  

    Abstract: Glaciers and ice sheets are recognised as important components of global biogeochemical cycles. Chemical sensors have great potential for in situ monitoring in the cryosphere and are available for many analytes of interest, but they are frequently ... ...

    Abstract Glaciers and ice sheets are recognised as important components of global biogeochemical cycles. Chemical sensors have great potential for in situ monitoring in the cryosphere and are available for many analytes of interest, but they are frequently unsuitable for deployment since meltwaters are cold, turbid, experience freeze-thaw cycles and display low ionic strength and concentrations of target analytes. Here, we review in situ chemical sensors currently available for measurement of biogeochemically important analytes and assess their suitability for deployment. These include standard parameters such as dissolved oxygen and pH, along with macronutrients (nitrate/nitrite and phosphate), micronutrients (iron and manganese) and biogenic gases (methane). Where no commercial alternatives are available, we discuss sensors currently in development, and their applicability to these extreme environments. The information presented has great relevance for future science in polar environments, and for the ultimate goal of obtaining in situ data from extreme, inaccessible subglacial environments.
    Keywords biogeochemical cycles ; data collection ; dissolved oxygen ; freeze-thaw cycles ; gas production (biological) ; glaciers ; ice ; ionic strength ; iron ; manganese ; methane ; monitoring ; nitrates ; nitrites ; pH ; phosphates
    Language English
    Dates of publication 2016-09
    Size p. 348-357.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 2014041-1
    ISSN 0165-9936
    ISSN 0165-9936
    DOI 10.1016/j.trac.2016.06.016
    Database NAL-Catalogue (AGRICOLA)

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