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Updated: May 5, 2026

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Capillary Flow-Driven, Disposable Device for Dissolved Oxygen Sensing in Water Samples.

Izabela Lewińska1, Prakash Aryal2, Eric Brack3

  • 1Faculty of Chemistry, University of Warsaw, Pasteura 1, Warsaw 02-093, Poland.

Analytical Chemistry
|November 5, 2025
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Summary
This summary is machine-generated.

A new, low-cost microfluidic device offers simple, disposable colorimetric determination of dissolved oxygen (DO). This user-friendly sensor is ideal for citizen science and widespread water quality monitoring.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Microfluidics

Background:

  • Declining dissolved oxygen (DO) levels in waterbodies are a growing concern.
  • Existing DO monitoring technologies are often expensive and require specialized training.

Purpose of the Study:

  • To develop a simple, user-friendly, and disposable microfluidic device for colorimetric dissolved oxygen (DO) determination.
  • To provide an accessible tool for water quality monitoring.

Main Methods:

  • A capillary flow-driven microfluidic device was constructed using PET film, adhesive, and glass microfiber with immobilized reagents.
  • A modified Winkler colorimetric assay was used for DO quantification.
  • The device allows direct sample collection by dipping into the water.

Main Results:

  • The developed device achieved a limit of detection of 1.7 ppm for DO.
  • Field applicability assessments confirmed robustness against environmental interference.
  • Validation with various freshwater and aquarium samples demonstrated high accuracy.

Conclusions:

  • The proposed microfluidic device offers a cost-effective and user-friendly solution for DO monitoring.
  • This technology has the potential to empower citizen-based water quality monitoring initiatives.
  • The sensor's ease of use and accuracy make it suitable for deployment in diverse environmental conditions.