Metered reagent injection into microfluidic continuous flow sampling for conductimetric ocean dissolved inorganic carbon sensing
Abstract Continuous autonomous measurement of total dissolved inorganic carbon (TCO 2 ) in the oceans is critical for climate change modelling and ocean acidification measurement. A microfluidic conductivity-based approach will permit integration of miniaturised chemical analysis systems into Argo o...
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Online Access: | http://dx.doi.org/10.1088/1361-6501/ab7405 https://iopscience.iop.org/article/10.1088/1361-6501/ab7405 https://iopscience.iop.org/article/10.1088/1361-6501/ab7405/pdf |
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crioppubl:10.1088/1361-6501/ab7405 2024-06-02T08:12:36+00:00 Metered reagent injection into microfluidic continuous flow sampling for conductimetric ocean dissolved inorganic carbon sensing Tweedie, Mark Macquart, Antonin Almeida, Joao Ward, Brian Maguire, Paul The Department of Employment and Learning, N. Ireland Invest N. Ireland National Science Foundation Science Foundation Ireland 2020 http://dx.doi.org/10.1088/1361-6501/ab7405 https://iopscience.iop.org/article/10.1088/1361-6501/ab7405 https://iopscience.iop.org/article/10.1088/1361-6501/ab7405/pdf unknown IOP Publishing http://creativecommons.org/licenses/by/4.0 https://iopscience.iop.org/info/page/text-and-data-mining Measurement Science and Technology volume 31, issue 6, page 065104 ISSN 0957-0233 1361-6501 journal-article 2020 crioppubl https://doi.org/10.1088/1361-6501/ab7405 2024-05-07T13:58:54Z Abstract Continuous autonomous measurement of total dissolved inorganic carbon (TCO 2 ) in the oceans is critical for climate change modelling and ocean acidification measurement. A microfluidic conductivity-based approach will permit integration of miniaturised chemical analysis systems into Argo ocean floats, for long-term, high-accuracy depth profiling of dissolved CO 2 with minimal reagent payload. Precise metering, suitable for sample acidification and CO 2 liberation, is addressed. Laser etched microfluidic snake channel restrictors and asymmetric Y-meters were fabricated, with channel dimensions down to ∼75 μm, to adjust metering ratios between seawater and acid simulants. Hydrodynamic resistances, from flow versus pressure measurements, were compared with finite element simulations for various cross-section profiles and areas. Microfluidic metering circuits were constructed from various resistance snake channels and Y-junction components. Sample to acid volume ratios (meter ratio) up to 100:1 have been achieved with 300 μm wide snake channels for lengths >m. At highest resolution, the footprint would be >600 mm 2 . Circuits based solely on asymmetric Y-junctions gave maximum meter ratios of 16:1 with a footprint of <40 mm 2 and ∼0.2% precision. Further refinement is required to ensure the integrity of such small channels in integration of metering units into full TCO 2 analysis microfluidic circuits. Article in Journal/Newspaper Ocean acidification IOP Publishing Measurement Science and Technology 31 6 065104 |
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Abstract Continuous autonomous measurement of total dissolved inorganic carbon (TCO 2 ) in the oceans is critical for climate change modelling and ocean acidification measurement. A microfluidic conductivity-based approach will permit integration of miniaturised chemical analysis systems into Argo ocean floats, for long-term, high-accuracy depth profiling of dissolved CO 2 with minimal reagent payload. Precise metering, suitable for sample acidification and CO 2 liberation, is addressed. Laser etched microfluidic snake channel restrictors and asymmetric Y-meters were fabricated, with channel dimensions down to ∼75 μm, to adjust metering ratios between seawater and acid simulants. Hydrodynamic resistances, from flow versus pressure measurements, were compared with finite element simulations for various cross-section profiles and areas. Microfluidic metering circuits were constructed from various resistance snake channels and Y-junction components. Sample to acid volume ratios (meter ratio) up to 100:1 have been achieved with 300 μm wide snake channels for lengths >m. At highest resolution, the footprint would be >600 mm 2 . Circuits based solely on asymmetric Y-junctions gave maximum meter ratios of 16:1 with a footprint of <40 mm 2 and ∼0.2% precision. Further refinement is required to ensure the integrity of such small channels in integration of metering units into full TCO 2 analysis microfluidic circuits. |
author2 |
The Department of Employment and Learning, N. Ireland Invest N. Ireland National Science Foundation Science Foundation Ireland |
format |
Article in Journal/Newspaper |
author |
Tweedie, Mark Macquart, Antonin Almeida, Joao Ward, Brian Maguire, Paul |
spellingShingle |
Tweedie, Mark Macquart, Antonin Almeida, Joao Ward, Brian Maguire, Paul Metered reagent injection into microfluidic continuous flow sampling for conductimetric ocean dissolved inorganic carbon sensing |
author_facet |
Tweedie, Mark Macquart, Antonin Almeida, Joao Ward, Brian Maguire, Paul |
author_sort |
Tweedie, Mark |
title |
Metered reagent injection into microfluidic continuous flow sampling for conductimetric ocean dissolved inorganic carbon sensing |
title_short |
Metered reagent injection into microfluidic continuous flow sampling for conductimetric ocean dissolved inorganic carbon sensing |
title_full |
Metered reagent injection into microfluidic continuous flow sampling for conductimetric ocean dissolved inorganic carbon sensing |
title_fullStr |
Metered reagent injection into microfluidic continuous flow sampling for conductimetric ocean dissolved inorganic carbon sensing |
title_full_unstemmed |
Metered reagent injection into microfluidic continuous flow sampling for conductimetric ocean dissolved inorganic carbon sensing |
title_sort |
metered reagent injection into microfluidic continuous flow sampling for conductimetric ocean dissolved inorganic carbon sensing |
publisher |
IOP Publishing |
publishDate |
2020 |
url |
http://dx.doi.org/10.1088/1361-6501/ab7405 https://iopscience.iop.org/article/10.1088/1361-6501/ab7405 https://iopscience.iop.org/article/10.1088/1361-6501/ab7405/pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Measurement Science and Technology volume 31, issue 6, page 065104 ISSN 0957-0233 1361-6501 |
op_rights |
http://creativecommons.org/licenses/by/4.0 https://iopscience.iop.org/info/page/text-and-data-mining |
op_doi |
https://doi.org/10.1088/1361-6501/ab7405 |
container_title |
Measurement Science and Technology |
container_volume |
31 |
container_issue |
6 |
container_start_page |
065104 |
_version_ |
1800759072860930048 |