Abstract
Canines are widely used for real-time detection of explosives and have proven to be on par with instrumental methods. Canines are thought to rely largely upon detection of volatile chemical constituents of the explosives, though not necessarily the explosive itself. Hence, it is crucial to understand the odor available to them as generated by training aids. Previous studies have established that the Training Aid Delivery Device (TADD) developed by SciK9 is a reliable training aid that reduces cross-contamination and doubles as a storage device. A TADD comprises a standardized container, a synthetic membrane, a membrane holder, and a lid. In the work presented, activated charcoal strips were placed above and below the TADD membrane to determine the relative amounts of volatiles emitted by dynamite (i.e., ethylene glycol dinitrate (EGDN) and trinitroglycerin (NG)). The strips were eluted and the extracts tested using gas chromatography–mass spectrometry in negative ion chemical ionization mode. A series of t-tests at 95% confidence level were performed to determine any differences in vapor composition above and below the membranes. Nine synthetic membranes and six glass fiber membranes were tested in this study. It was expected that the relative concentration of volatiles would remain the same on both sides of the membrane; however, selective removal of nitroglycerin by some membranes was observed. Synthetic membranes with larger pore sizes showed no alteration in the vapor composition. Both synthetic and glass fiber membranes did not show a significant change in relative concentration of the other volatile compound in dynamite, i.e., EGDN. Out of all the membranes tested, three synthetic membranes and four glass fiber membranes showed selective alteration in odor availability of nitroglycerin in dynamite. For training purposes, membranes that do not alter the vapor composition should be used in the training aid.
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References
Furton KG, Myers LJ. The scientific foundation and efficacy of the use of canines as chemical detectors for explosives. Talanta. 2001;54(3):487–500.
Phillips RC. Training dogs for explosives detection, Interim Report. US Army Technical Report, LWL-CR-01B70. 1977.
Davis K, Reavis M, Goodpaster JV. Characterization of an odor permeable membrane device for the storage of explosives and use as canine training aids. J Forensic Sci. 2023;68(3):815–27.
Harper RJ, Almirall JR, Furton KG. Identification of dominant odor chemicals emanating from explosives for use in develo** optimal training aid combinations and mimics for canine detection. Talanta. 2005;67(2):313–27.
Singh S. Sensors—an effective approach for the detection of explosives. J Hazard Mater. 2007;144(1–2):15–28.
Cobb M, Branson N, McGreevy P, Lill A, Bennett P. The advent of canine performance science: offering a sustainable future for working dogs. Behav Proc. 2015;1(110):96–104.
Helton WS. Canine ergonomics: the science of working dogs. CRC Press; 2009.
Sanchez CL, Huertas A, Prada PA, Furton KG. A non-contact passive approach for the effective collection of target explosive volatiles for canine training aid development. J Forensic Sci Criminol. 2016;4(2):205.
ANSI/ASB Standard 092. Standard for training and certification of canine detection of explosives. Colorado Springs, CO: AAFS Standards Board; 2021.
Cormier S, Fobes J, Hallowell SF, Barrientos J, Fischer DS, Federal aviation administration technical center Atlantic City NJ. FAA K-9 program quality control aid test and evaluation plan. Atlantic City, NJ: Federal Aviation Administration Technical Center. 1995.
Williams M, Johnston JM. Training and maintaining the performance of dogs (Canis familiaris) on an increasing number of odor discriminations in a controlled setting. Appl Anim Behav Sci. 2002;78(1):55–65.
Grate JW, Ewing RG, Atkinson DA. Vapor-generation methods for explosives-detection research. TrAC, Trends Anal Chem. 2012;1(41):1–4.
Ong TH, Ljunggren J, Mendum T, Geurtsen G, Kunz RR. Vapor signatures of double-base smokeless powders and gunshot residues for supporting canine odor imprinting. ACS Omega. 2022;7(26):22567–76.
Lotspeich E, Kitts K, Goodpaster J. Headspace concentrations of explosive vapors in containers designed for canine testing and training: theory, experiment, and canine trials. Forensic Sci Int. 2012;220(1–3):130–4.
Mansourizadeh A, Ismail AF. Effect of additives on the structure and performance of polysulfone hollow fiber membranes for CO2 absorption. J Membr Sci. 2010;348(1–2):260–7.
Maughan MN, inventor; Excet Inc, assignee. Methods of using training aid delivery devices (TADD). United States patent US 10,813,342. 2020.
Mach P, Sharpes C, Carmany D. Evaluation of the SciK9 training aid delivery device for containment of powders. US Army Combat Capabilities Development Command Chemical Biological Center, Aberdeen Proving Ground, MD. 2021.
Maughan MN, Best EM, Gadberry JD, Sharpes CE, Evans KL, Chue CC, Nolan PL, Buckley PE. The use and potential of biomedical detection dogs during a disease outbreak. Front Med. 2022;4(9): 848090.
Pui WK, Yusoff R, Aroua MK. A review on activated carbon adsorption for volatile organic compounds (VOCs). Rev Chem Eng. 2019;35(5):649–68.
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The authors would like to acknowledge technical assistance from Jenna Gadberry and Michele Maughn.
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This research was supported by the Department of Defense (Excet Award ID 101132.0.202.0). The opinions, findings, and conclusions expressed here are those of the author and do not necessarily reflect those of the Department of Defense.
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Himanshi Upadhyaya: analysis, investigation, conceptualization, writing—original draft, visualization.
John V. Goodpaster—conceptualization, supervision, writing—review and editing.
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Upadhyaya, H., Goodpaster, J.V. Effect of membrane properties on the odor emanating from training aids for explosive-detecting canines. Anal Bioanal Chem 416, 4219–4225 (2024). https://doi.org/10.1007/s00216-024-05359-w
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DOI: https://doi.org/10.1007/s00216-024-05359-w