Sampling Protocols for the Detection of Smokeless Powder Residues Using Capillary Electrophoresis

Sampling Protocols for the Detection of Smokeless Powder Residues Using Capillary Electrophoresis
Author: WA. MacCrehan
Publisher:
Total Pages: 6
Release: 1998
Genre: Capillary electrophoresis
ISBN:

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Present techniques for the detection of gunshot residue rely primarily metallic primer components such as lead, barium and antimony. With the advent of reformulated primers that reduce or eliminate these elements, new methods for the detection of organic residue compounds will be needed. Micellar electrokinetic capillary electrophoresis (MECE) is one technique that has been successfully applied to the analysis of these smokeless powder residue compounds.

Detection of Smokeless Powder Residue on Pipe Bombs by Micellar Electrokinetic Capillary Electrophoresis

Detection of Smokeless Powder Residue on Pipe Bombs by Micellar Electrokinetic Capillary Electrophoresis
Author: KD. Smith
Publisher:
Total Pages: 6
Release: 1999
Genre: Capillary electrophoresis
ISBN:

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Improvised explosive devices are an increasing concern among law enforcement agencies within the United States because of their destructive capability. Capillary electrophoresis has been used previously for the forensic analysis of inorganic constituents in explosives. Micellar electrokinetic capillary electrophoresis (MECE), also known as micellar electrokinetic chromatography (MEKC), is well suited for the forensic analysis of organic constituents of these materials because of its high sensitivity and small sample requirements.

A Comparison of Smokeless Powders and Mixtures by Capillary Zone Electrophoresis

A Comparison of Smokeless Powders and Mixtures by Capillary Zone Electrophoresis
Author: KG. Hopper
Publisher:
Total Pages: 9
Release: 2005
Genre: Capillary electrophoresis
ISBN:

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The analysis of inorganic ions present in smokeless and muzzleloading powders has been performed using capillary zone electrophoresis (CZE) Previous publications have examined inorganic low explosives using CZE, but have not looked at the ion profiles from smokeless powders. In this report, seven commercially available smokeless powders were analyzed as unburned powder and burned residue. The results demonstrate that ionic profiles can be used to characterize smokeless powders. Our analysis also included a smokeless powder/ Pyrodexê combination to determine if smokeless powder ions are distinguishable in a mixture; however, the high concentration of ions present in Pyrodexê RS prevented its detection. In addition, five different smokeless powder samples as well as Pyrodexê RS were collected for analysis subsequent to deflagration in fifteen plastic pipe bombs. The relative ion concentrations between these powders can be used to illustrate the differences between open burning and pipe bomb deflagration.

Current Methods in Forensic Gunshot Residue Analysis

Current Methods in Forensic Gunshot Residue Analysis
Author: A. J. Schwoeble
Publisher: CRC Press
Total Pages: 187
Release: 2000-06-27
Genre: Law
ISBN: 1420042572

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With the improvements in collection methods and analytical tools that allow more thorough analyses, gunshot residue examination has made a dramatic impact as an area of trace evidence essential to the investigation and prosecution of violent crime. Current Methods in Forensic Gunshot Residue Analysis deals with major areas of gunshot residue analysis, including current and future methods of analysis, collection techniques, interpretation of evidence, expert testimony and report writing. This text is a necessity for forensic scientists conducting this type of analysis and anyone involved in the investigation and prosecution of violent crimes involving firearms.

Comparing the Additive Composition of Smokeless Gunpowder and Its Handgun-fired Residues

Comparing the Additive Composition of Smokeless Gunpowder and Its Handgun-fired Residues
Author: MR. Reardon
Publisher:
Total Pages: 7
Release: 2000
Genre: Capillary electrophoresis
ISBN:

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Detecting the use of handguns via the determination of the organic additives in smokeless gunpowder residues (OGSR) presents a promising alternative to primer metal residue analysis. Compositional analysis of the gunpowder additives nitroglycerin, diphenylamine, and ethyl centralite provides information that can associate residue samples with unfired gunpowder. We evaluated the composition of seven reloading smokeless gunpowders, both in bulk and as single particles, by ultrasonic solvent extraction/capillary electrophoresis. Handgun-fired residues obtained from three common weapon calibers loaded with the known reloading powders were compared with the unfired powders. In general, the composition of the residues was similar to that found in the unfired powders. For double-base powders, comparing the ratio of the propellant (P) to the total amount of stabilizer (S) for both residue and gunpowder samples proved to be a useful measurement for identification. This P/S ratio demonstrated that the additives in the residues did not greatly change relative to the unfired powder, providing a useful indicator to aid in forensic powder and residue evaluation.

Emerging Technologies for the Analysis of Forensic Traces

Emerging Technologies for the Analysis of Forensic Traces
Author: Simona Francese
Publisher: Springer Nature
Total Pages: 275
Release: 2019-09-30
Genre: Science
ISBN: 3030205428

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This book provides a line of communication between academia and end users/practitioners to advance forensic science and boost its contribution to criminal investigations and court cases. By covering the state of the art of promising technologies for the analysis of trace evidence using a controlled vocabulary, this book targets the forensics community as well as, crucially, informing the end users on novel and potential forensic opportunities for the fight against crime. By reporting end users commentaries at the end of each chapter, the relevant academic community is provided with clear indications on where to direct further technological developments in order to meet the law requirements for operational deployment, as well as the specific needs of the end users. Promising chemistry based technologies and analytical techniques as well as techniques that have already shown to various degrees an operational character are covered. The majority of the techniques covered have imaging capabilities, that is the ability to visualize the distribution of the target molecules within the trace evidence recovered. This feature enhances intelligibility of the information making it also accessible to a lay audience such as that typically found with a court jury. Trace evidence discussed in this book include fingermarks, bodily fluids, hair, gunshot residues, soil, ink and questioned documents thus covering a wide range of possible evidence recovered at crime scenes.

Analysis and Characterization of Smokeless Powders and Smokeless Powder Residues

Analysis and Characterization of Smokeless Powders and Smokeless Powder Residues
Author: Emily Christine Lennert
Publisher:
Total Pages: 0
Release: 2022
Genre:
ISBN:

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The ability to associate a smokeless powder, smokeless powder residue, or organic gunshot residue (OGSR) to one another may be helpful in determining the origin of a suspected sample and aid in linking a suspect to a crime scene. In this study, smokeless powders were extracted and analyzed via gas chromatography -- mass spectrometry (GC-MS) and direct analysis in real time -- high resolution mass spectrometry (DART-HRMS). Subsequently, group definition was performed using hierarchical cluster analysis and principal component analysis followed by internally validated classification models. Then, smokeless powder residues were generated in-lab and extracted. Resulting residue data from each instrument was classified within the respective smokeless powder model using linear discriminant analysis (LDA) with external test sets. Residue groupings and classification models were also generated. Ammunition was loaded with known smokeless powder, then fired to collect OGSR from cloth targets. The OGSR was extracted and analyzed via DART-HRMS and GC-MS, then tested against the smokeless powder and residue models to determine the association of OGSR to its intact smokeless powder as well as to lab generated residues. Reference classes for the OGSR samples in the LDA prediction were determined via flow charts for informed analyst determination of class in smokeless powder and residue models. Standards of common smokeless powder components were pyrolyzed and an expected pyrolysis products profile was created for each sample based on the intact composition. Similarity and correlation metrics including Pearson’s correlation, Sørensen-Dice similarity coefficient, and Concordance correlation were evaluated in the comparison of smokeless powder to residue and residue to expected pyrolysis products. Pearson’s correlation was used in the comparison of smokeless powder to OGSR and smokeless powder residue to OGSR.

Firearm and Toolmark Examination and Identification

Firearm and Toolmark Examination and Identification
Author: Max M. Houck
Publisher: Elsevier
Total Pages: 228
Release: 2015-10-17
Genre: Law
ISBN: 0128006226

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The Advanced Forensic Science Series grew out of the recommendations from the 2009 NAS Report: "Strengthening Forensic Science: A Path Forward." This volume, Firearm and Toolmark Examination and Identification, will serve as a graduate-level text for those studying and teaching firearm and toolmark examination and identification. It will also prove an excellent reference for forensic practitioner’s libraries or use in their casework. Coverage includes a wide variety of tools and toolmarks, analysis of gunshots, ammunition, gunshot wounds and professional issues they may encounter. Provides basic principles of forensic science and an overview of firearms and toolmarks Contains information on a wide variety of tools and toolmarks Covers the analysis and interpretation of gunshots, ammunition and gunshot wounds Includes a section on professional issues, such as: from crime scene to court, lab reports, and health and safety Incorporates effective pedagogy, key terms, review questions, discussion question and additional reading suggestions