A subsequent procedure for further deciphering weapons after application of the Trace Metal Detection Test (TMDT): Proof of concept

Xing, Zhuo; Lü, Sijia; Wang, Aihua; Yang, Renqiang

doi:10.1016/j.forsciint.2020.110253

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…Cosmetics, illicit substances and gunshot residues all contain metal ions, which can be detected in fingermark residue through the use of coloured or fluorescent indicators. [24][25][26][27][28][29][30] However, such methods do not offer high elemental specificity, and it is challenging to identify if nonspecific and generic presence of metal ions can be linked to a particular physical activity, or if "false-positives" could occur from endogenous biological metal ions naturally secreted through the fingertips. Through detailed understanding of the specific metal ions that are transferred to and persist within fingermarks, there may be scope to develop improved and/or targeted strategies to detect metal ions using various coloured or fluorescent indicators.…”

Section: Introductionmentioning

confidence: 99%

The transfer and persistence of metals in latent fingermarks

Boseley

Howard

Hackett

et al. 2022

Analyst

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Section: Introductionmentioning

confidence: 99%

The transfer and persistence of metals in latent fingermarks

Boseley

Howard

Hackett

et al. 2022

Analyst

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show abstract

Section: Introductionmentioning

confidence: 99%

The transfer and persistence of metals in latent fingermarks

Boseley

Howard

Hackett

et al. 2021

Preprint

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In forensic science, knowledge and understanding of material transfer and persistence is inherent to the interpretation of trace evidence and can provide vital information on the activity level surrounding a crime. Detecting metal ions in fingermark residue has long been of interest in the field of forensic science, due to the possibility of linking trace metal ion profiles to prior activity with specific metal objects (e.g. gun or explosive handling). Unfortunately, the imaging capability to visualise trace metal ions at sufficient spatial resolution to determine their distribution within a fingermark (micron level) was not previously available. Here, we demonstrate for the first time transfer and persistence of metals in fingermarks, at micron spatial resolution, using synchrotron sourced x-ray fluorescence microscopy. Fingermarks were taken before and after brief handling of a gun barrel, ammunition cartridge case and party sparkler to demonstrate the transfer of metals. The results reveal increased metal content after contact with these objects, and critically, a differential pattern of metal ion increase was observed after handling different objects. Persistence studies indicate that these metals are removed as easily as they are transferred, with a brief period of hand washing appearing to successfully remove metallic residue from subsequent fingermarks. Preliminary work using x-ray absorption near edge structure spectroscopic mapping highlighted the potential use of this technique to differentiate between different chemical forms of metals and metal ions in latent fingermarks. It is anticipated that these findings can now be used to assist future work for the advancement of trace metal detection tests and fingermark development procedures

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“…Thus, for health and environmental protection, it is vital to employ sensitive and routine methods suitable for on-site monitoring of this hazardous element. Different spectrometric techniques (the most frequently applied is inductively coupled plasma mass spectrometry (ICP-MS)), are used for the measurement of lead concentration, but they require expensive and bulky instrumentation as well as expert technicians, which make them unsuitable for on-site applications [4,5]. On the other hand, anodic stripping voltammetry (ASV), providing inexpensive and portable instrumentation, simple operational protocols, and enhanced analytical sensitivity, has been recognized as the gold standard technique for heavy metal determination [6,7].…”

Section: Introductionmentioning

confidence: 99%

Voltammetric Determination of Pb(II) by a Ca-MOF-Modified Carbon Paste Electrode Integrated in a 3D-Printed Device

Vlachou

Margariti

Papaefstathìou

et al. 2020

Sensors

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In this work, a voltammetric method based on a metal organic framework (Ca-MOF)-modified carbon paste electrode for lead determination was developed. The MOF-based electrode was packed in a new type of 3D-printed syringe-type integrated device, which was entirely fabricated by a dual extruder 3D printer. After optimization of the operational parameters, a limit of detection of 0.26 µg L−1 Pb(II) was achieved, which is lower than that of existing MOF-based lead sensors. The device was used for Pb(II) determination in fish feed and bottled water samples with high accuracy and reliability. The proposed sensor is suitable for on-site analyses and provides a low-cost integrated transducer for the ultrasensitive routine detection of lead in practical applications.

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A subsequent procedure for further deciphering weapons after application of the Trace Metal Detection Test (TMDT): Proof of concept

Cited by 4 publications

References 18 publications

The transfer and persistence of metals in latent fingermarks

The transfer and persistence of metals in latent fingermarks

The transfer and persistence of metals in latent fingermarks

Voltammetric Determination of Pb(II) by a Ca-MOF-Modified Carbon Paste Electrode Integrated in a 3D-Printed Device

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