Detection of explosives on the surface of banknotes by Raman hyperspectral imaging and independent component analysis

Almeida, Mariana Ramos; Correa, Deleon Nascimento; Zacca, Jorge Jardim; Logrado, Lúcio Paulo Lima; Poppi, Ronei J.

doi:10.1016/j.aca.2014.12.034

Cited by 40 publications

(21 citation statements)

References 20 publications

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“…The achieved data revealed good agreement with those obtained by IC technique, thus demonstrating the huge potential of ME‐C 4 D devices for quantitative analysis. In addition to the LOD, it is important to note that the proposed methodology is faster and cheaper than most of the standard approaches including IC , capillary electrophoresis , and Raman spectroscopy . Considering the achieved results, the method reported herein demonstrated to be quite effective to detect and quantify anionic species in real samples collected from ATM and safe explosions.…”

Section: Discussionmentioning

confidence: 86%

“…The limit of detection (LOD) for chloride, nitrate, sulfate, chlorate, perchlorate and nitrite was estimated based on the signal‐to‐noise ratio equal to 3 and the achieved values were 3.8, 4.3, 2.5, 7.3, 6.1 and 9.5 μmol/L, respectively. When compared to conventional techniques including IC , capillary electrophoresis , and Raman spectroscopy , the LOD values obtained using ME‐C 4 D devices are greater. The data achieved were also compared to other reports found in the literature exploiting electrophoresis microchips coupled with conductivity detection in both contactless and contact modes.…”

Section: Resultsmentioning

confidence: 94%

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Rapid separation of post‐blast explosive residues on glass electrophoresis microchips

et al. 2018

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This study describes the development of an analytical methodology based on the use of microchip electrophoresis (ME) devices integrated with capacitively coupled contactless conductivity detection (C4D) for the separation and detection of inorganic anions in post‐blast explosive residues. The best separation condition was achieved using a running buffer composed of 35 mmol/L lactic acid, 10 mmol/L histidine and 0.070 mmol/L cetyl(trimethyl ammonium) bromide. For C4D measurements, the highest sensitivity was obtained applying a 700 kHz sinusoidal wave with excitation voltage of 20 Vpp. The separation of Cl−, NO3−, NO2−, SO42−, ClO4− and ClO3− was performed within ca. 150 s with baseline resolution and efficiencies between 4.4 × 104 and 1.7 × 105 plates/m. The found limits of detection ranged between 2.5 and 9.5 μmol/L. Last, real samples of post‐blast explosive residues were analyzed on the ME‐C4D devices obtaining successfully the determination of Cl−, NO3− and SO42−. The achieved concentration values varied between 12.8–72.5 mg/L for Cl−, 1.7–293.1 mg/L for NO3− and 1.3–201.3 mg/L for SO42−. The data obtained using ME‐C4D devices were in good agreement with the concentrations found by ion chromatography. The approach reported herein has provided short analysis time, instrumental simplicity, good analytical performance and low cost. Furthermore, the ME‐C4D devices emerge as a powerful and portable analytical platform for on‐site analysis demonstrating to be a promising tool for the crime scene investigation.

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Section: Discussionmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 94%

Rapid separation of post‐blast explosive residues on glass electrophoresis microchips

et al. 2018

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“…Poppi and co-workers 157,158 published two studies for the identification of explosive traces in banknotes using the same Raman imaging instrument (laser excitation 785 nm). In the first, 157 they developed the methodology for the identification of pre-blast traces of eight explosives (three military, four commercial and one propellant) on banknotes. They also analyzed different concentrations of trinitrotoluene (TNT), for investigating detection limits.…”

Section: Raman Spectroscopymentioning

confidence: 99%

Vibrational Spectroscopy and Chemometrics in Forensic Chemistry: Critical Review, Current Trends and Challenges

Silva¹,

Braz²,

Pimentel³

2019

J. Braz. Chem. Soc.

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The present manuscript makes an extensive review of the scientific approaches developed in the last decade involving infrared and Raman spectroscopy combined with chemometrics for solving several issues in the investigation of the most relevant forensic traces, such as questioned documents and currency, explosives, gunshot residues, illicit drugs and body fluids. In addition, current trends, main challenges and the adequate use of several chemometric techniques are discussed. Principal component analysis (PCA) was found to be the most used technique. This unsupervised approach, however, has sometimes been misunderstood as a classification technique. Discriminant analysis techniques are widely employed, leaving a range of possibilities for application of class-modeling techniques, particularly in cases of problems regarding only one target class. In addition, increasingly complex dataset structures frequently require nonlinear approaches or flexible techniques such as multivariate curve resolution-alternating least squares (MCR-ALS). Results reporting, however, still lack reliable quality parameters and sample representativeness, posing a significant challenge to the solution of forensic problems. Regarding the analytical techniques, Raman has been playing an important role, especially in the area of questioned documents and of body fluids. Portable and hyperspectral imaging infrared spectrometers have also been showing significant potential in forensic applications.

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“…RDX has a much higher photolysis quantum yield of 0.35 . We calculated a solution state quantum yield for PETN of φ ~ 0.08 …”

Section: Uv Raman Spectroscopy Of Explosivesmentioning

confidence: 99%

Review of explosive detection methodologies and the emergence of standoff deep UV resonance Raman

Gares

Hufziger

Bykov

et al. 2016

J Raman Spectroscopy

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Due to terrorist use of explosive devices, intense interest has been directed towards the development of techniques and instrumentation to detect explosives. A number of analytical techniques are currently under investigation for trace explosive detection. Several methods have been successfully commercialized including colorimetric kits, fluorescence quenching sensors, and ion mobility spectrometers that see widespread field use. A key limitation of all currently utilized field techniques is that they require close proximity or physical interaction with the object being analyzed. The ideal trace explosive detection technique would be able to detect trace amounts of explosives from a distance to ensure personnel safety. Laser‐based spectroscopies are the only currently viable techniques that can be utilized to sense trace amounts of explosives at standoff distances. This review compares currently used explosive detection techniques with recently developed standoff methods. We emphasize the development of UV resonance Raman spectroscopy for standoff explosive detection. This work has recently been enabled by advances in laser and spectrometer design. Trace explosive detection has also been advanced by the recently developed understanding of deep UV photochemistry for several explosive molecules. Copyright © 2016 John Wiley & Sons, Ltd.

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Detection of explosives on the surface of banknotes by Raman hyperspectral imaging and independent component analysis

Cited by 40 publications

References 20 publications

Rapid separation of post‐blast explosive residues on glass electrophoresis microchips

Rapid separation of post‐blast explosive residues on glass electrophoresis microchips

Vibrational Spectroscopy and Chemometrics in Forensic Chemistry: Critical Review, Current Trends and Challenges

Review of explosive detection methodologies and the emergence of standoff deep UV resonance Raman

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