An autonomous lab-on-chip sensor for in situ measurements of seawater total alkalinity

Schaap, Allison; Papadimitriou, Stathys; Loucaides, Socratis; Mowlem, Matthew C.

doi:10.29363/nanoge.eimc.2021.029

Proceedings of the Emerging Investigators in Microfluidics Conference 2021

DOI: 10.29363/nanoge.eimc.2021.029

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An autonomous lab-on-chip sensor for in situ measurements of seawater total alkalinity

Allison Schaap

Stathys Papadimitriou

Socratis Loucaides

et al.

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“…Shipboard and lab-based instruments also exist, with strong performance in terms of accuracy and precision, ,, for example, the CONTROS FIA system . The National Oceanographic Center (NOC) in Southampton, UK, has also developed a microfluidic in situ alkalinity analyzer with an estimated precision of 5 μmol kg –1 . This device, or one similar to it, was used in a controlled CO 2 release experiment .…”

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“… 13 The National Oceanographic Center (NOC) in Southampton, UK, has also developed a microfluidic in situ alkalinity analyzer with an estimated precision of 5 μmol kg –1 . 23 This device, or one similar to it, was used in a controlled CO 2 release experiment. 24 Despite the rapid progress in alkalinity analyzer development, encouraged and sustained by the demand for carbon cycle and OAE studies, there remains a need for a rugged, miniaturized, cost-effective autonomous instrument.…”

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An Automated Microfluidic Analyzer for In Situ Monitoring of Total Alkalinity

et al. 2023

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We have designed, built, tested, and deployed an autonomous in situ analyzer for seawater total alkalinity. Such analyzers are required to understand the ocean carbon cycle, including anthropogenic carbon dioxide (CO2) uptake and for mitigation efforts via monitoring, reporting, and verification of carbon dioxide removal through ocean alkalinity enhancement. The microfluidic nature of our instrument makes it relatively lightweight, reagent efficient, and amenable for use on platforms that would carry it on long-term deployments. Our analyzer performs a series of onboard closed-cell titrations with three independent stepper-motor driven syringe pumps, providing highly accurate mixing ratios that can be systematically swept through a range of pH values. Temperature effects are characterized over the range 5–25 °C allowing for field use in most ocean environments. Each titration point requires approximately 170 μL of titrant, 830 μL of sample, 460 J of energy, and a total of 105 s for pumping and optical measurement. The analyzer performance is demonstrated through field data acquired at two sites, representing a cumulative 25 days of operation, and is evaluated against laboratory measurements of discrete water samples. Once calibrated against onboard certified reference material, the analyzer showed an accuracy of −0.17 ± 24 μmol kg–1. We further report a precision of 16 μmol kg–1, evaluated on repeated in situ measurements of the aforementioned certified reference material. The total alkalinity analyzer presented here will allow measurements to take place in remote areas over extended periods of time, facilitating affordable observations of a key parameter of the ocean carbon system with high spatial and temporal resolution.

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An Automated Microfluidic Analyzer for In Situ Monitoring of Total Alkalinity

et al. 2023

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An autonomous lab-on-chip sensor for in situ measurements of seawater total alkalinity

Cited by 1 publication

References 0 publications

An Automated Microfluidic Analyzer for In Situ Monitoring of Total Alkalinity

An Automated Microfluidic Analyzer for In Situ Monitoring of Total Alkalinity

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