Regional discrimination of oysters using laser-induced breakdown spectroscopy

Akpovo, Charlemagne; Martínez, Jorge; Lewis, Dawn E.; Branch, John W.; Schroeder, Alexander; Edington, Maurice D.; Johnson, Lewis

doi:10.1039/c3ay40491a

Cited by 13 publications

(12 citation statements)

References 31 publications

(31 reference statements)

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“…All of these ICP-based analytical techniques facilitate measurement of the molar concentrations of each element incorporated into the mollusc shell carbonate. In contrast, Laser-Induced Breakdown Spectroscopy (LIBS) has been much less frequently used for determinations of mollusc shell elemental concentrations [9][10][11][12]. One of the main advantages of LIBS, compared to ICP-based techniques, is the reduction in the time required to perform spatially-resolved analyses, because LIBS does not require extensive sample preparation [13]; LA-ICP-MS also is considerably more costly and complex instrumentation [14,15].…”

Section: Introductionmentioning

confidence: 99%

Mg/Ca profiles within archaeological mollusc (Patella vulgata) shells: Laser-Induced Breakdown Spectroscopy compared to Inductively Coupled Plasma-Optical Emission Spectrometry

García-Escárzaga

Clarke

Gutiérrez-Zugasti

et al. 2018

Spectrochimica Acta Part B: Atomic Spectroscopy

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Biogenic carbonate mollusc shells have the unique property of being a durable material found in many archaeological and geological sites, recording in their shell chemical composition the ambient environmental conditions during the mollusc's lifespan. In particular, mollusc shell Mg/Ca ratios have been suggested to be related to seawater temperature, although such a relationship is controversial and appears to be species-and even location-specific. This study investigates the use of Laser-Induced Breakdown Spectroscopy (LIBS) for the rapid 2 measurement of Mg/Ca profiles within Patella vulgata shells, via comparison with one established analytical technique that is most often used for this purpose, ICP-OES. LIBS offers some advantages over other spectrometric techniques, including ICP-OES, the latter requiring initial micromilling of sample powders. LIBS offers faster measurement, reduced sample preparation, easier automation and less complex and lower cost instrumentation. A high correlation is evident between LIBS and ICP-OES Mg/Ca profiles within four archaeological P. vulgata shells, as well as strong similarities between LIBS measurements made in two different areas of each P. vulgata shell (i.e. the apex and a more conventional transect along the axis of shell growth). Validation of the LIBS technique for determination of Mg/Ca profiles within P. vulgata shells has implications for archaeological studies, because a greater number of shell specimens sampled from each archaeological site and chronological level can be measured, thereby improving the statistical robustness of data interpretation and conclusions. One example archaeological application that would benefit from application of the LIBS technique is identification of the season-of-capture of marine molluscs as a food resource for prehistoric societies.

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Section: Introductionmentioning

confidence: 99%

Mg/Ca profiles within archaeological mollusc (Patella vulgata) shells: Laser-Induced Breakdown Spectroscopy compared to Inductively Coupled Plasma-Optical Emission Spectrometry

García-Escárzaga

Clarke

Gutiérrez-Zugasti

et al. 2018

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…PLS-DA is a supervised classification algorithm [ 18 , 21 ]. The input variables were complete spectra and selected spectral lines.…”

Section: Methodsmentioning

confidence: 99%

“…Based on the elemental “fingerprint” and multivariate analysis, LIBS technique was able to discriminate geological materials [ 20 ]. Akpovo et al [ 21 ] used principal components analysis (PCA), discriminant function analysis (DFA), and hierarchical cluster analysis (HCA) to discriminate the geographical origin of oysters. Alvey et al [ 22 ] applied a PLS-DA algorithm for classification of garnet samples based on geochemical fingerprinting via LIBS.…”

Section: Introductionmentioning

confidence: 99%

Rapid Elemental Analysis and Provenance Study of Blumea balsamifera DC Using Laser-Induced Breakdown Spectroscopy

Liu

Zhang

et al. 2014

Sensors

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Laser-induced breakdown spectroscopy (LIBS) was applied to perform a rapid elemental analysis and provenance study of Blumea balsamifera DC. Principal component analysis (PCA) and partial least squares discriminant analysis (PLS-DA) were implemented to exploit the multivariate nature of the LIBS data. Scores and loadings of computed principal components visually illustrated the differing spectral data. The PLS-DA algorithm showed good classification performance. The PLS-DA model using complete spectra as input variables had similar discrimination performance to using selected spectral lines as input variables. The down-selection of spectral lines was specifically focused on the major elements of B. balsamifera samples. Results indicated that LIBS could be used to rapidly analyze elements and to perform provenance study of B. balsamifera.

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“…PCA was successfully used to classify 4 widely used plastics (polyethylene terephthalate, high‐density polyethylene, polypropylene, and polystyrene), and the parameters of Mahalanobis distances and spectral residual error were optimized to improve the accuracy of the PCA classification model . Akpovo et al used LIBS to analyze the elemental composition of oysters collected from 2 different coastal estuarine reserves. PCA was applied to a data matrix of identified elemental lines, resulting in intrasite and intersite clustering of the oysters according to their geographical origin, and 91.3% of unselected original grouped cases was correctly classified.…”

Section: Qualitative Analysismentioning

confidence: 99%

Chemometrics in laser‐induced breakdown spectroscopy

Zhang

Tang

2018

Journal of Chemometrics

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Laser-induced breakdown spectroscopy (LIBS) is a new type of elemental analytical technology with the advantages of real-time, online, and noncontact as well as enabling the simultaneous analysis of multiple elements. It has become a frontier analytical technique in spectral analysis. However, the issue of how to improve the accuracy of qualitative and quantitative analyses by extracting useful information from a large amount of complex LIBS data remains the main problem for the LIBS technique. Chemometrics is a chemical subdiscipline of multi-interdisciplinary methods; it offers advantages in data processing, signal analysis, and pattern recognition. It can solve some complicated problems that are difficult for traditional chemical methods. In this paper, we reviewed the research progress of chemometrics methods in LIBS for spectral data preprocessing as well as for qualitative and quantitative analyses in the most recent 5 years (2012-2016). KEYWORDSchemometrics, data preprocessing, laser-induced breakdown spectroscopy, qualitative analysis, quantitative analysis | INTRODUCTIONAs one of the most promising analytical tools in the 21st century, laser-induced breakdown spectroscopy (LIBS) is a novel analytical technique for materials and elements; it is based on atomic emission spectroscopy and a laser as an excitation source. 1-4 In LIBS, a low-energy pulse laser (typically tens to hundreds of millijoules per pulse) generated from a laser device is reflected by a plane mirror and focused by a plano-convex lens onto the sample surface; a laser-induced plasma with high temperature is then generated. The light with different frequencies is radiated during the plasma cooling process, and it is collected by an optical fiber coupled to a spectrometer. The qualitative and quantitative analyses by the LIBS technique can be performed using the wavelength and integrated intensity of the spectral line. A schematic diagram of the LIBS instrument is presented in Figure 1. It consists of Nd:YAG laser, optical part, X-Y-Z manual micrometric stage, optical fiber, spectrometer, Charge coupled device (CCD) camera, and computer.The LIBS technology has benefited from the invention of the ruby crystal laser 5 and was first reported by Brech and Cross. 6 It has become a research focus in the spectral field with the development of laser and optical detection techniques. Compared with conventional analytical tools, LIBS demonstrates some substantial advantages with regards to being rapid, real-time, on-site, and nondestructive while allowing remote detection without complicated sample preparation procedures as well as simultaneous multicomponent analysis. 7-9 Because of these advantages, LIBS technology has been widely used in process analysis and in the control of industrial manufacturing, food supervision, environmental monitoring, historical relic identification, and space exploration. [10][11][12][13] The National Aeronautics and

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Regional discrimination of oysters using laser-induced breakdown spectroscopy

Cited by 13 publications

References 31 publications

Mg/Ca profiles within archaeological mollusc (Patella vulgata) shells: Laser-Induced Breakdown Spectroscopy compared to Inductively Coupled Plasma-Optical Emission Spectrometry

Mg/Ca profiles within archaeological mollusc (Patella vulgata) shells: Laser-Induced Breakdown Spectroscopy compared to Inductively Coupled Plasma-Optical Emission Spectrometry

Rapid Elemental Analysis and Provenance Study of Blumea balsamifera DC Using Laser-Induced Breakdown Spectroscopy

Chemometrics in laser‐induced breakdown spectroscopy

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