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Semi-quantitative microfluidic paper-based analytical device for ionic silica detection.

Mami Ogawa1, Aya Katoh1, Ryuichi Matsubara2

  • 1Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa, 223-8522, Japan.

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
|May 15, 2023
PubMed
Summary

A new foldable paper device offers a simple, low-cost method for detecting ionic silica in industrial water. This portable tool aids in on-site monitoring to prevent silica scaling.

Keywords:
Industrial water analysisMicrofluidicsMolybdenum blue reactionPaper-based devicesSilicate ion

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Area of Science:

  • Analytical Chemistry
  • Materials Science

Background:

  • Silicate ions (SiO3^2-) cause silica scaling in industrial water, necessitating continuous monitoring and control.
  • Conventional spectrophotometry for ionic silica detection is complex and unsuitable for on-site applications.

Purpose of the Study:

  • To develop a portable, low-cost microfluidic paper-based analytical device (µPAD) for on-site silicate ion detection.
  • To address the limitations of conventional methods for industrial water monitoring.

Main Methods:

  • A foldable origami-based µPAD was designed for silicate detection.
  • The device utilizes the molybdenum blue reaction for colorimetric analysis.
  • The method was optimized for sensitivity and selectivity.

Main Results:

  • The paper-based device enabled semi-quantitative detection of silicate ions in the range of 50-1000 mg/L.
  • A lowest detectable concentration of 50 mg/L was achieved.
  • The device demonstrated selectivity for silicate ions and stability for over 21 days at 4°C.

Conclusions:

  • The developed foldable µPAD provides a practical and cost-effective solution for on-site industrial water monitoring.
  • This paper-based analytical device facilitates timely detection and control of silicate levels, preventing scaling.
  • The technology shows promise for improving industrial water management and process efficiency.