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Self-referencing optical fiber pH sensor for marine microenvironments.

Wan-Har Chen1, Wayne D N Dillon1, Evelyn A Armstrong2

  • 1Department of Chemistry, University of Otago, Dunedin, New Zealand.

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|February 17, 2021
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Summary
This summary is machine-generated.

A new optical fiber pH sensor measures marine microenvironment acidity with high precision. This self-referencing sensor, using meta-cresol purple, is ideal for observing ocean acidification effects on seaweed.

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Area of Science:

  • Marine Science
  • Sensor Technology
  • Analytical Chemistry

Background:

  • Ocean acidification poses a significant threat to marine ecosystems.
  • Accurate, continuous pH monitoring in microenvironments is crucial for understanding these impacts.
  • Existing pH sensors often lack the precision or applicability for localized marine studies.

Purpose of the Study:

  • To develop and validate a novel optical fiber pH sensor for continuous monitoring in marine microenvironments.
  • To assess the sensor's performance against established ocean acidification observing guidelines.
  • To demonstrate the sensor's utility in real-time ecological studies.

Main Methods:

  • Fabrication of an optical fiber sensor utilizing a sol-gel matrix (tetraethoxysilane and dimethyldiethoxysilane) for enhanced pH indicator (meta-cresol purple) entrapment.
  • Characterization of sensor performance, including precision (0.02 pH units), dynamic range (7.4-9.7 pHT in seawater), response time (2.5-6.5 min), and operational lifetime (7 days).
  • Deployment of the self-referencing sensor for real-time pH monitoring within the canopy and diffusion boundary layer of Ulva sp. seaweed.

Main Results:

  • The developed optical fiber pH sensor meets the Global Ocean Acidification Observing Network "weather" measurement quality guideline.
  • The sensor exhibits high precision, a wide dynamic range, and a rapid response time suitable for marine applications.
  • Successful 7-day monitoring of pH variations within a seaweed canopy and 4-day monitoring within its diffusion boundary layer was achieved.

Conclusions:

  • The optical fiber pH sensor offers a robust, self-referencing solution for continuous pH measurements in marine microenvironments.
  • Its performance and demonstrated suitability for monitoring seaweed metabolic activity highlight its potential for ocean acidification research.
  • The sensor's simple fabrication and instrumentation facilitate broader application in marine ecological studies.