Article

Estimation of Ti on textiles by LIBS method

January 2010

Authors:

Mária Průšová

Technical University of Liberec

Technical University of Liberec

Miloslav Pouzar

University of Pardubice

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LIBS analysis of chromium in samples of dyed wool fabric

Article

Apr 2009
J ANAL ATOM SPECTROM

A method for the analysis of chromium in wool fabric samples was developed. It is fast and cheap with no sample preparation. This method involved the use of double pulse Laser Induced BreakdownSpectrometry (LIBS) for the wool fabric samples dyed by two types of metal complex dyes (C.I. Acid Orange 173 and C.I. Acid Black 60). A commercially available LIBS spectrometer was calibrated with the aid of authentic wool fabric samples previously analysed by F-AAS after microwave digestion. Comparable results can be obtained using this unique procedure if the same set of standards is used for XRF and LIBS calibration. Limits of detection for chromium achieved by suggested LIBS methods (from 5 to 10 mg kg−1) are comparable with the WDXRF ones (from 4 to 5 mg kg−1).

Article

LIBS analysis of chromium in samples of dyed wool fabric

April 2009 · Journal of Analytical Atomic Spectrometry

A method for the analysis of chromium in wool fabric samples was developed. It is fast and cheap with no sample preparation. This method involved the use of double pulse Laser Induced BreakdownSpectrometry (LIBS) for the wool fabric samples dyed by two types of metal complex dyes (C.I. Acid Orange 173 and C.I. Acid Black 60). A commercially available LIBS spectrometer was calibrated with the aid ... [Show full abstract] of authentic wool fabric samples previously analysed by F-AAS after microwave digestion. Comparable results can be obtained using this unique procedure if the same set of standards is used for XRF and LIBS calibration. Limits of detection for chromium achieved by suggested LIBS methods (from 5 to 10 mg kg−1) are comparable with the WDXRF ones (from 4 to 5 mg kg−1).

Article

Spectrochemical mapping using laser induced breakdown spectroscopy as a more objective approach to s...

February 2019 · Spectrochimica Acta Part B Atomic Spectroscopy

This study proposes the application of Laser-induced breakdown spectroscopy (LIBS) as a novel and practical method to detect gunshot residues around bullet holes and to estimate shooting distances in firearm-related criminal events. Clothing samples fired at different distance intervals were analyzed by LIBS, and the spectral data collected from these experiments were used to construct 2D ... [Show full abstract] elemental maps. Spatial distributions of inorganic gunshot residues (IGSR), such as lead, barium, and antimony, were used to classify the shooting distance range. Seventy-three cotton textiles of different color and fabric patterns were shot using a 9 mm pistol and a Rossi revolver with different ammunition. Forty-five of the fabrics were shot at known distances to create a control training set, while the remaining twenty-eight samples were used as blind items, of unknown distances to the examiner, to test the accuracy of the method. The performance of the LIBS method was compared to visual and colorimetric tests currently used by crime laboratories. Results show that LIBS offers superior sensitivity, selectivity, reproducibility, and accuracy compared to color tests. Unlike the conventional assays, LIBS produces permanent chemical images that allow objective statistical treatment of the data. Principal Component Analysis and Discriminant Analysis of LIBS data resulted in 100% correct classification of the shooting distance ranges, while color tests resulted in 78.6% correct classification, 3.6% misclassification, and 17.8% inconclusive results. The LIBS method offered improvements over conventional tests such as simplicity, versatility, and reliability. First, the technique is virtually reagent-free, does not require sample preparation and the micro-beam can be scanned across a target in a matter of minutes. Second, the ablation platform can accommodate diverse substrates, and the laser settings can be controlled to offer different solutions, from ultra-fast screening for the identification of IGSR on bullet entrance holes to detailed chemical mappings for shooting distance determinations. Finally, LIBS affords a more reliable and objective presentation of the scientific results in the courtroom. The incorporation of LIBS in forensic laboratories will help to modernize current methodologies and increase the scientific validity of the detection of gunshot residues in crime scene reconstructions.

Article

Full-text available

Analysis of Ti in textile stippled by TiO2 nanoparticle sol using double-pulse LIBS and ED XRF spect...

November 2011 · Journal of Applied Spectroscopy

Double-pulse LIBS and ED XRF usabilities for quantitative analysis of Ti in samples of cotton, wool, and viscose fabrics were compared to each other. The analyzed samples were prepared by stippling a particular fabric with TiO2 nanoparticle sol (particle size 100 nm). Both spectrometers were calibrated with the aid of the same sets of authentic fabric samples previously analyzed by ICP OES after ... [Show full abstract] the microwave digestion. Average values of the Ti concentration calculated from five repeated measurements of the same sample obtained by LIBS and ED XRF were comparable for all types of the tested materials (100∙(CTi-LIBS/CTi-ED XRF)) ≅ 96–109%), but the precision of analysis expressed as RSD (relative standard deviation) was usually better for ED XRF (RSDLIBS from 9 to 25%, RSDED XRF from 3 to 17%). Poor RSD values of LIBS measurements were observed mainly in the case of samples with lower areal weights. Limits of detection calculated as a triple standard deviation of five repeated measurements of Ti in a sample with the low concentration of the analyte were comparable for both methods (LODLIBS = from 15 to 97, and LODED XRF = from 21 to 64, all in mg/kg).