Elemental analysis and characterization of electrical tape backings by LA-ICP-MS

Martinez-Lopez, Claudia; Trejos, Tatiana; Mehltretter, Andria; Almirall, José R.

doi:10.1016/j.forc.2017.03.003

Cited by 21 publications

(7 citation statements)

References 7 publications

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“…The pairs K1 and Q2 belong to the same roll of tape (3M Scotch 700). These samples were selected from a set of tapes that was previously analyzed by most of the techniques in question, and were not previously differentiated by physical and microscopic examination, IR spectroscopy, or Py-GC-MS, but were differentiated by LA-ICP-MS [6,17].…”

Section: Interlaboratory Exercise #2 Resultsmentioning

confidence: 99%

“…Participants were asked to compare each known and questioned sample by their available methodology. For the participants without a protocol for the specific instrumentation, a set of parameters were suggested for the analysis of tapes by such a technique, based on previous studies [6,17]. The participant laboratories were asked to provide detailed description of the parameters used for the elemental analysis techniques; this would allow to estimate the effect of some parameters in the sensitivity and selectivity of the method.…”

Section: Instrumental Parametersmentioning

confidence: 99%

“…Data pre-processing for LA-ICP-MS for spectral overlay included the removal of non-relevant mass-to-charge peaks originating from polyatomic and isobaric interferences [20] and normalization to the sum of the intensity peaks as a mean to compensate for any shot-to-shot variation and inter-day variations [17]. In the absence of an internal standard, this normalization strategy accounts for small differences in the ablated mass between samples and improves both repeatability and reproducibility of each individual sample [17]. All the isotopes selected for LA-ICP-MS were confirmed by their isotopic pattern and natural abundance.…”

Section: Data Pre-processingmentioning

confidence: 99%

“…More recently, the methods of analysis incorporating Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) [17] and Laser Induced Breakdown Spectroscopy (LIBS) [18] have been developed for the chemical analysis of tape samples. These techniques have shown promising results for the analysis of tapes by increasing the number of elements detected, the confirmatory value of the results, and the sensitivity and selectivity of the analysis.…”

Section: Introductionmentioning

confidence: 99%

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Interlaboratory evaluations of the performance of elemental analytical methods for the forensic analysis and comparisons of electrical tapes

et al. 2019

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Adhesive tapes are an important type of evidence related to violent crimes such as the construction of improvised explosive devices and kidnappings as well as involved in other types of common evidence such as drug packaging. The methods of comparison of tape evidence consist of physical and microscopic examination followed by chemical analysis of the organic and inorganic components inherent to the tapes as part of their formulations. This work evaluates the performance of the conventional methods used in forensic analysis of adhesive tapes (physical and microscopic examination, FTIR, Py-GC-MS, and SEM-EDS) and the more recently developed elemental methods, LIBS and LA-ICP-MS, for the comparison of tape samples in different laboratories. Two interlaboratory exercises were designed to study the performance of the different analytical methods for the forensic analysis of electrical tapes. The exercises were developed with the objective to imitate forensic case scenarios where known and question tapes are compared following the laboratory's analytical protocol. The participants were asked to compare the tape

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Section: Interlaboratory Exercise #2 Resultsmentioning

confidence: 99%

Section: Instrumental Parametersmentioning

confidence: 99%

Section: Data Pre-processingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interlaboratory evaluations of the performance of elemental analytical methods for the forensic analysis and comparisons of electrical tapes

et al. 2019

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“…Additives present in it may consist of aliphatic or aromatic plasticizers; tackifiers such as terpene resins, wood rosin, rosin esters, and terpene phenolics; fillers such as TiO 2 , silica, CaCO 2 , kaolin, mica, talc, and antioxidants such as amines, phenolics, and dithiocarbamates [18]. These variations in chemical components allow the discrimination between electrical tape samples as previous studies have shown by employing analytical techniques such as FTIR [17][18][19], Py-GC-MS [2,19], SEM-EDS [15,17,19], XRD [15], LA-ICP-MS [10,20], carbon isotope ratio [21], and XRF [8,12,18]. The choice of analytical techniques to be adopted for electrical tape analysis depends largely upon the target surface (i.e., adhesive or backing side) to be analyzed.…”

Section: Introductionmentioning

confidence: 99%

Discrimination of electrical tapes using ATR‐FTIR spectroscopy and chemometrics

Nimi

Chophi

Singh

2022

Journal of Forensic Sciences

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Electrical tapes are recovered during criminal investigations as physical evidence in cases of rape, kidnapping, and explosion incidents. The analysis of such evidence can provide an evidentiary link between the suspect, the victim, object, or the crime scene. In the present study, 25 brands of electrical tapes have been analyzed using ATR‐FTIR (attenuated total reflectance Fourier transform infrared) spectroscopy. Samples (1 cm2) were analyzed in the mid IR (Infrared) region from 4000–600 cm−1, and the functional groups of various components have been profiled. Chemometric methods‐PCA (principal component analysis) and PCA‐LDA (linear discriminant analysis) have been employed to interpret the data and classify the samples into its respective classes. Preliminary assessment of sample clustering due to similar chemical composition was visualized using PCA. PCA‐LDA applied for classification purpose yielded classification accuracy (calibration) of 92.98% for the adhesive side and 88% for the backing side. The validation results showed classification accuracy of 89.47% for the adhesive side and 84% for the backing side. Blind validation study was carried out using 5 samples, and classification accuracy of 100% and 80% was obtained for the adhesive and the backing side, respectively. In the current study, a preliminary substrate study was carried out, and the results showed that the backing samples could be more accurately matched to their correct source of origin than the adhesive side.

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Mass Spectrometry Applications in Forensic Science

Smith

Tran

2019

Encyclopedia of Analytical Chemistry

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Mass spectrometry (MS) is a technique widely used in forensic science for the identification of molecular or elemental composition of submitted evidence. Relatively small, volatile, nonpolar molecules, such as ignitable liquids and some drugs, can be analyzed with electron and chemical ionization (CI) coupled with single‐stage mass analyzers that provide molecular weight and structural information. Nonvolatile and polar molecules such as other drugs, poisons, and/or their metabolites can be identified using electrospray or related soft ionization techniques. The use of tandem MS with these compounds allows structure elucidation and provides excellent screening and quantitative results. Ambient ionization sources allow sampling directly from a surface with minimal sample preparation required. Elemental profiles also provide reliable methods for distinguishing between forensic samples. This article aims to provide an overview of the MS instrumentation, techniques, and applications within the field of forensic science.

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Elemental analysis and characterization of electrical tape backings by LA-ICP-MS

Cited by 21 publications

References 7 publications

Interlaboratory evaluations of the performance of elemental analytical methods for the forensic analysis and comparisons of electrical tapes

Interlaboratory evaluations of the performance of elemental analytical methods for the forensic analysis and comparisons of electrical tapes

Discrimination of electrical tapes using ATR‐FTIR spectroscopy and chemometrics

Mass Spectrometry Applications in Forensic Science

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