A Novel Lab-on-Chip Spectrophotometric pH Sensor for Autonomous In Situ Seawater Measurements to 6000 m Depth on Stationary and Moving Observing Platforms

We report a new, autonomous Lab-on-Chip (LOC) microfluidic pH sensor with a 6000 m depth capability, ten times the depth capability of the state of the art autonomous spectrophotometric sensor. The pH is determined spectrophotometrically using purified meta-Cresol Purple indicator dye offering high...

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Published in:Environmental science & technology 2021-11, Vol.55 (21), p.14968-14978
Main Authors: Yin, Tianya, Papadimitriou, Stathys, Rérolle, Victoire M.C, Arundell, Martin, Cardwell, Christopher L, Walk, John, Palmer, Martin R, Fowell, Sara E, Schaap, Allison, Mowlem, Matthew C, Loucaides, Socratis
Format: Article
Language:English
Subjects:
Biogeochemical Cycling
Chemical analysis
Coastal waters
Cresols
Lab-on-a-chip
Marine ecosystems
Microfluidics
pH effects
pH sensors
Platforms
Reagents
Seawater
Sensors
Spectrophotometry
Water analysis
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cited_by cdi_FETCH-LOGICAL-a309t-fc80b667b4f22f8d95f1e4c115fff12bf35840e8c077e3ddd3a37a9e5f579f753
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container_end_page 14978
container_issue 21
container_start_page 14968
container_title Environmental science & technology
container_volume 55
creator Yin, Tianya
Papadimitriou, Stathys
Rérolle, Victoire M.C
Arundell, Martin
Cardwell, Christopher L
Walk, John
Palmer, Martin R
Fowell, Sara E
Schaap, Allison
Mowlem, Matthew C
Loucaides, Socratis
description We report a new, autonomous Lab-on-Chip (LOC) microfluidic pH sensor with a 6000 m depth capability, ten times the depth capability of the state of the art autonomous spectrophotometric sensor. The pH is determined spectrophotometrically using purified meta-Cresol Purple indicator dye offering high precision (
doi_str_mv 10.1021/acs.est.1c03517
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The pH is determined spectrophotometrically using purified meta-Cresol Purple indicator dye offering high precision (&lt;0.001 pH unit measurement reproducibility), high frequency (every 8 min) measurements on the total proton scale from the surface to the deep ocean (to 600 bar). The sensor requires low power (3 W during continuous operation or ∼1300 J per measurement) and low reagent volume (∼3 μL per measurement) and generates small waste volume (∼2 mL per measurement) which can be retained during deployments. The performance of the LOC pH sensor was demonstrated on fixed and moving platforms over varying environmental salinity, temperature, and pressure conditions. Measurement accuracy was +0.003 ± 0.022 pH units (n = 47) by comparison with validation seawater sample measurements in coastal waters. The combined standard uncertainty of the sensor in situ pHT measurements was estimated to be ≤0.009 pH units at pH 8.5, ≤ 0.010 pH units at pH 8.0, and ≤0.014 pH units at pH 7.5. 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source American Chemical Society:Jisc Collections:American Chemical Society Read & Publish Agreement 2022-2024 (Reading list)
subjects Biogeochemical Cycling
Chemical analysis
Coastal waters
Cresols
Lab-on-a-chip
Marine ecosystems
Microfluidics
pH effects
pH sensors
Platforms
Reagents
Seawater
Sensors
Spectrophotometry
Water analysis
title A Novel Lab-on-Chip Spectrophotometric pH Sensor for Autonomous In Situ Seawater Measurements to 6000 m Depth on Stationary and Moving Observing Platforms
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