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Microfluidic paper-based analytical device for particulate metals.

Mallory M Mentele1, Josephine Cunningham, Kirsten Koehler

  • 1Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States.

Analytical Chemistry
|April 12, 2012
PubMed
Summary
This summary is machine-generated.

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A novel microfluidic paper-based analytical device (μPAD) offers rapid, low-cost occupational exposure assessment for airborne metals. This method accurately quantifies metal aerosols using colorimetric detection on a disposable chip.

Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Materials Science

Background:

  • Occupational exposure to metal-containing aerosols poses significant health risks.
  • Current methods for assessing metal aerosol exposure can be time-consuming and expensive.
  • There is a need for rapid, cost-effective, and sensitive detection methods.

Purpose of the Study:

  • To develop and validate a microfluidic paper-based analytical device (μPAD) for assessing occupational exposure to metal-containing aerosols.
  • To enable rapid, on-site quantification of particulate metals like iron (Fe), copper (Cu), and nickel (Ni).

Main Methods:

  • Fabrication of μPADs using wax printing for integrated sample handling and detection.
  • Rapid acid digestion of metal particulates collected on air sampling filters directly on the μPAD.

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  • Colorimetric detection of digested metals using pre-deposited reagents and image analysis.
  • Utilizing dried buffer components for pH control and precomplexation agents to minimize interferences.

    • Main Results:

    • Achieved reproducible, log-linear calibration curves for Fe, Cu, and Ni.
    • Method detection limits ranged from 1.0 to 1.5 μg per metal.
    • Demonstrated good correlation with known metal amounts in an analyzed incineration ash aerosol sample.
    • Validated the μPAD's ability to detect metal concentrations at or below regulatory limits.

    Conclusions:

    • The developed μPAD provides a rapid, sensitive, and cost-effective tool for occupational metal aerosol exposure assessment.
    • This technology has the potential to significantly improve workplace safety monitoring.
    • The μPAD offers a promising alternative to conventional analytical techniques for metal analysis.