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Standardized Method for Measuring Collection Efficiency from Wipe-sampling of Trace Explosives
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Standardized Method for Measuring Collection Efficiency from Wipe-sampling of Trace Explosives.

Jennifer R Verkouteren1, Jeffrey A Lawrence2, Matthew E Staymates2

  • 1Materials Measurement Science Division, National Institute of Standards and Technology; jennifer.verkouteren@nist.gov.

Journal of Visualized Experiments : Jove
|April 28, 2017
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Summary
This summary is machine-generated.

Effective sample collection is crucial for detecting explosives. This study introduces an automated device to standardize wipe-sampling, optimizing protocols for screening venues by controlling key factors like force, distance, and speed.

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Area of Science:

  • Forensic Science
  • Analytical Chemistry
  • Materials Science

Background:

  • Effective trace explosive detection relies heavily on efficient sample collection methods.
  • Wipe-sampling is the standard technique, but lacks standardized efficiency measurements.
  • Optimizing sampling protocols is essential for security screening venues.

Purpose of the Study:

  • To develop a standardized measurement infrastructure for evaluating wipe-sampling collection efficiency.
  • To control critical factors influencing sample collection.
  • To guide the development of optimized sampling protocols for explosives detection.

Main Methods:

  • An automated device was developed to control applied force, travel distance, and travel speed during wipe-sampling.
  • Test surfaces mimicking screening environments were used.
  • Simulated explosive residues (1,3,5-trinitroperhydro-1,3,5-triazine - RDX) were applied via inkjet printing onto PTFE substrates.
  • Collection efficiency was quantified by measuring extracted explosive from the wipe.

Main Results:

  • The study established a method to measure the collection efficiency of wipe-sampling for explosive traces.
  • The influence of controlled factors (force, distance, speed) on collection efficiency was investigated.
  • The relationship between sampling parameters, wipe material, and test surface was analyzed.

Conclusions:

  • The developed measurement infrastructure provides a means to evaluate and optimize wipe-sampling protocols.
  • Standardized measurements are crucial for improving the reliability of explosives detection at screening venues.
  • This research aids in developing faster and more efficient sampling strategies for security applications.