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Objective color scale for the SWYPE surface sampling technique using computerized image analysis tools.

Diana M Ceballos1, Michael G Yost, Stephen G Whittaker

  • 1Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington 98195-7234, USA.

Journal of Occupational and Environmental Hygiene
|July 17, 2009
PubMed
Summary
This summary is machine-generated.

Colorimetric SWYPE pads offer a fast, inexpensive method for detecting aliphatic isocyanates, crucial in automotive coatings. Objective RGB analysis enhances accuracy and lowers detection limits for surface contamination assessment.

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Area of Science:

  • Industrial Hygiene
  • Analytical Chemistry
  • Materials Science

Background:

  • Aliphatic isocyanates are key components in automotive coatings.
  • Surface contamination by unpolymerized isocyanates poses health and quality risks.
  • Colorimetric SWYPE pads provide a visual, albeit subjective, method for detection.

Purpose of the Study:

  • To develop an objective quantification method for isocyanate contamination using SWYPE pads.
  • To enhance the sensitivity and accuracy of SWYPE pad analysis.
  • To validate the developed method against established analytical techniques.

Main Methods:

  • Development of an objective color scale for isocyanate loading.
  • Digitization of SWYPE pads using a calibrated flatbed scanner.
  • Red-green-blue (RGB) histogram analysis of SWYPE images.
  • Creation of a calibration curve using reference images.
  • Cross-validation with high-performance liquid chromatography (HPLC).

Main Results:

  • Quantification of isocyanate contamination from 0.01 to 24.0 microg/cm(2).
  • Achieved reproducibility and accuracy exceeding 90%.
  • Surface extraction efficiency surpassed 90%.
  • RGB analysis demonstrated a lower detection limit (approx. 3 microg) compared to visual scoring (approx. 10 microg).

Conclusions:

  • SWYPE pads combined with RGB analysis provide a rapid, inexpensive, and objective method for assessing aliphatic isocyanate surface contamination.
  • This method offers improved sensitivity and accuracy over traditional visual inspection.
  • The technique is suitable for applications in industrial settings like autobody shops.