A new method to reduce false positives due to antimony in detection of gunshot residues

Aksoy, Çağdaş; Bora, Feyza; Şenocak, Nilgün; Aydın, Fırat

doi:10.1016/j.forsciint.2015.03.006

Cited by 17 publications

(11 citation statements)

References 11 publications

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“…However, this instrumentation is also expensive and this technique not yet widespread. In this context, other techniques have been employed, such as graphite furnace atomic absorption spectroscopy (GF AAS), 13 inductively coupled plasma mass spectrometry (ICP-MS), 14,15 laser induced breakdown spectroscopy (LIBS) 16 and inductively coupled plasma atomic emission spectrometry (ICP OES). 17 These are mainly used in methods where prior to subjecting a sample to an analytical technique for the determination of total element concentrations, sample dissolution or extraction is performed, so that shape, size, and individual particle identification are impaired.…”

Section: Luisa P Ferreira a Clésia C Nascentes * A Frederico N mentioning

confidence: 99%

Feasibility of a New Method for Identification and Discrimination of Gunshot Residues by Total Reflection X-Ray Fluorescence and Principal Component Analysis

Ferreira¹,

Nascentes²,

Valladão³

et al. 2019

J. Braz. Chem. Soc.

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This study aims at identifying and discriminating gunshot residue (GSR) from conventional ammunition of six different calibers by total reflection X-ray fluorescence (TXRF) and pattern recognition by principal component analysis (PCA). GSR samples were collected from hands of volunteer shooters with swabs moistened with deionized water and were extracted with 5% v v-1 nitric acid. Aliquots were deposited on quartz disks for further determination by TXRF of the elements Al,

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Section: Luisa P Ferreira a Clésia C Nascentes * A Frederico N mentioning

confidence: 99%

Feasibility of a New Method for Identification and Discrimination of Gunshot Residues by Total Reflection X-Ray Fluorescence and Principal Component Analysis

Ferreira¹,

Nascentes²,

Valladão³

et al. 2019

J. Braz. Chem. Soc.

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“…Inorganic gunshot and explosive residues can provide important information in the forensic reconstruction of shooting incidents and are usually analyzed with neutron activation analysis (NAA) [49], atomic absorption spectrometry (AAS)-based methods [50,51], inductively coupled plasma (ICP) [52], and SEM combined to energy dispersion analysis (SEM-EDX) [53]. Organic gunshot and explosive residues can be analyzed with gas chromatography (GC), GS-MS, or HPLC [54].…”

Section: Gunshot and Explosive Residuesmentioning

confidence: 99%

Forensic Potential of Atomic Force Microscopy with Special Focus on Age Determination of Bloodstains

Smijs¹,

Hosseinzoi²,

Galli³

2019

Atomic-Force Microscopy and Its Applications

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An important aspect of any crime scene investigation is to detect, secure and analyze trace evidence. In forensic examinations where topographic characterization is important like in fingermark, textile and document forgery examinations, the atomic force microscopy (AFM) imaging technique can be of value. However, it is the force spectroscopy that could make AFM a versatile tool in crime investigations. Particularly, the ability to measure changes in mechanical properties of forensic trace material over time makes this technology in potential interesting for forensic examinations. The usefulness of force measurements to evaluate the elasticity of red blood cells (RBCs) in relation to the age of a bloodstain is an interesting example. With minimally invasive AFM technology, timedependent alterations in the viscoelasticity of RBCs that occur during the aging of bloodstains can be featured. A discrimination between traces left by the perpetrator and other persons that have been present at the crime scene will thus be enabled. A recently obtained proof-of-concept demonstrating the usefulness of AFM for age estimation of bloodstains will be described. Additionally, the usefulness of AFM imaging and force spectroscopy for human hair, document forgery, textile fiber, fingermark and gunshot and explosive residue examinations will be discussed.

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“…Various metal ions present in GSR with potential to react with rhodizonate ion, such as Ba(II), Ca(II), Cu(II), Zn(II) and Fe(II), 12 were tested for their interference effects on the distancebased detection of Pb(II). Different amounts of these ions were added to a test solution containing 300 mg L -1 of Pb(II) and the solutions analyzed using the developed method.…”

Section: Interference Studymentioning

confidence: 99%

“…5 Various analytical methods for the identification of Pb in GSR have been proposed, [6][7][8][9][10][11][12] from a simple colorimetric test [6][7][8] to advanced instrumentation, such as atomic absorption spectroscopy (AAS), 9 inductively coupled plasma-optical emission spectroscopy (ICP-OES), 3,4 inductively coupled plasma-mass spectroscopy (ICP-MS), 10 X-ray fluorescence (XRF), 11 scanning electron microscopy/energy X-ray spectroscopy technique (SEM/EXS). 12 SEM/EXS has been used by a large number of experts because it allows for the correlation of morphology and chemical composition of individual particles composed of Pb, Ba and Sb. On the other hand, ICP-OES and ICP-MS techniques appear to be more promising and versatile in terms of quantitative analysis, since these techniques provide higher sensitivity and accuracy than those obtained from SEM/EXS.…”

Section: Introductionmentioning

confidence: 99%

Microfluidic Paper-based Analytical Device for Quantification of Lead Using Reaction Band-length for Identification of Bullet Hole and Its Potential for Estimating Firing Distance

et al. 2018

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A low-cost and user-friendly microfluidic paper-based analytical device (μPAD) was developed for identification of bullet hole from gunshot residue (GSR) on cotton fabric target. The device (25 × 82 mm) is made of filter paper with a printed pattern consisting of a circular sample loading reservoir (6 mm i.d.), a circular waste reservoir (4 mm i.d.) and a straight flow channel (3 mm wide and 60 mm long). A sticker with a ruler scale in millimeters was mounted alongside the channel. The straight channel is first impregnated with rhodizonate and dried at ambient temperature. Tartrate extract of the target fabric is loaded on the sample reservoir. If Pb(II) ions are present in the extract, pink streak of Pb(II)-rhodizonate precipitate is formed as the sample solution flows from the reservoir along the channel. The length of the pink strip is employed to estimate the firing distance.

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A new method to reduce false positives due to antimony in detection of gunshot residues

Cited by 17 publications

References 11 publications

Feasibility of a New Method for Identification and Discrimination of Gunshot Residues by Total Reflection X-Ray Fluorescence and Principal Component Analysis

Feasibility of a New Method for Identification and Discrimination of Gunshot Residues by Total Reflection X-Ray Fluorescence and Principal Component Analysis

Forensic Potential of Atomic Force Microscopy with Special Focus on Age Determination of Bloodstains

Microfluidic Paper-based Analytical Device for Quantification of Lead Using Reaction Band-length for Identification of Bullet Hole and Its Potential for Estimating Firing Distance

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