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Standardized Sample Preparation Using a Drop-on-Demand Printing Platform
ARMY RESEARCH LAB ADELPHI MD
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Hazard detection systems must be evaluated with appropriate test material concentrations under controlled conditions in order to accurately identify and quantify unknown residues commonly utilized in theater. The existing assortment of hazard reference sample preparation methodstechniques presents a range of variability and reproducibility concerns, making it increasingly difficult to accurately assess optically- based detection technologies. To overcome these challenges, we examined the optimization, characterization and calibration of microdroplets from a drop-on-demand microdispenser that has a proven capability for the preparation of energetic reference materials. Research presented herein focuses on the development of a simplistic instrument calibration technique and sample preparation protocol for explosive materials testing based on drop-on-demand technology. Droplet mass and reproducibility were measured using ultraviolet-visible UV-Vis absorption spectroscopy. The results presented here demonstrate the operational factors that influence droplet dispensing for specific materials e.g., energetic and interferents. Understanding these parameters permits the determination of droplet and sample uniformity and reproducibility typical R sq values of 0.991, relative standard deviation or RSD or 5, and thus the demonstrated maturation of a successful and robust methodology for energetic sample preparation.
APPROVED FOR PUBLIC RELEASE