Showing papers in "Spectrochimica Acta Part B: Atomic Spectroscopy in 2018"

TL;DR: This work critically assess and elaborate on the approaches to utilize PCA in LIBS data processing, and derives some implications and suggests advice in data preprocessing, visualization, dimensionality reduction, model building, classification, quantification and non-conventional multivariate mapping.

TL;DR: In this paper, the promising variant of the Laser Induced Breakdown Spectroscopy (LIBS) technique, namely Nanoparticle - Enhanced LIBS (NELIBS), is described.

TL;DR: In this article, a combination of magnetic field and laser induced breakdown spectroscopy (LIBS) was used to improve the detection limit of heavy elements in different Soil samples and the emission intensity enhancement was attributed to magnetic confinement of the laser-generated plasma.

TL;DR: In this article, a laser-induced breakdown spectroscopy (LIBS) technique coupled with random forest (RF) was developed and used to classify ceramics from different dynasties.

TL;DR: The hints and drawbacks of ICP-MS application to the measurement of a set of less-studied technology-critical elements (Nb, Ta, Ga, In, Ge and Te) are discussed in this article.

TL;DR: In this article, the authors investigated the impact of data provided by complementary laser-based spectroscopic methods on multivariate classification accuracy of five Staphylococcus bacterial strains and one strain of Escherichia coli.

TL;DR: In this article, the authors performed comparative measurements by LIBS, X-ray Fluorescence (XRF) and Particle Induced X-Ray Emission (PIXE) on four typologies of materials.

TL;DR: A Laser-Induced Breakdown Spectroscopy (LIBS) approach to early diagnosis of a form of skin cancer, melanoma, based on the analysis of biological fluids harvested from diseased mice and healthy controls is reported.

TL;DR: In this article, the authors demonstrate the capabilities of laser-induced breakdown spectroscopy (LIBS) to perform fast high-resolution multi-elemental mappings of geological samples.

TL;DR: The dangers of a ‘black box’ approach in LIBS multivariate analysis are discussed, and how to overcome them using the chemical-physical knowledge that is at the base of any LIBS quantitative analysis is discussed.

TL;DR: In this article, the potential of several techniques commonly used in research studies for TiO2 nanoparticles' (NPs) characterization was evaluated for the implementation in routine analysis, including Dynamic Light Scattering (DLS), single-particle mode Inductively Coupled Plasma Mass Spectrometry (spICP-MS), and Asymmetrical Flow Field-Flow Fractionation coupled to Multi Angle LightScattering and (single particle) Inductive-Coupled Plasma mass Spectrometric (AF4-MALS)-MS) were assessed for this purpose.

TL;DR: In this paper, a collinear long short dual-pulse laser-induced breakdown spectroscopy (DP-LIBS) method was employed to enhance and stabilize the laser induced plasma from steel sample.

TL;DR: In this paper, three different ways of calculating the limit of detection (LOD) and limit of quantification (LOQ) are compared, and the validation of the model is based on different test sets, which are varying in their composition.

TL;DR: In this paper, a fast method for obtaining a quantitative elemental mapping of highly inhomogeneous samples by μ-LIBS maps is proposed, which allows the analysis of large maps through the use of a self-organizing map clustering method coupled to Calibration-Free LIBS for quantification of cluster prototypes.

TL;DR: In this article, a fly ash sample from an eastern U.S. coal power plant was analyzed to determine and quantify the mineralogical association of rare earth elements (REE) using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and a scanning electron microscope equipped with an energy-dispersive X-ray spectrometer (SEM-EDS).

TL;DR: The results show that the serum-LIBS technique can serve as a quick, less invasive and robust method for diagnosis and discrimination of human malignancies.

TL;DR: In this article, a new method for calculating the molecular ratio, which is an important control parameter that represents the acidity of the electrolyte, was proposed, and experiments were performed on solid electrolyte samples to test the performance of the proposed method.

TL;DR: In this paper, the authors compared several univariate and multivariate methods of LIBS data interpretation, such as least absolute shrinkage and selection operator and principal components regression, to reduce the interference of matrix effect in soils within the scope of data analysis.

TL;DR: In this article, a simple, cost-effective, and highly sensitive method was developed for the determination of trace cadmium in rice samples based on a new high-efficient liquid spray dielectric barrier discharge induced plasma (LSDBD) vapor generation coupled with atomic fluorescence spectrometry (AFS).

TL;DR: In this paper, the degradation processes that take place in bricks exposed to marine environments have been studied, taking into account the importance of this building material where the silicates present in the final product act as stabilizer in the porous material itself, it is necessary to understand the decay processes that occur in these aggressive environments.

TL;DR: In this article, the impact of univariate and multivariate data evaluation approaches on the quantification of nutrients in soil is discussed, which reflect trends also observed for other elements like magnesium, silicon and iron.

TL;DR: In this article, the emission spectra of zirconium metal in air obtained for a normal-pulse laser (6 ns) and a longpulse (100 ns) (wavelength: 1064nm, pulse energy: 12.5mJ, spot diameter: 0.35mm) were compared to investigate the fundamental aspects of fiber-optic LIBS with the long-Pulse laser.

TL;DR: In this paper, the spectral data of eight T91 and 12Cr1MoV steel specimens with different aging grades were obtained by laser induced breakdown spectroscopy (LIBS), and two representative feature selection methods including analysis of variance (ANOVA) and LGR filter were utilized to reduce the high dimensional LIBS data (12,281 initial variables) into fewer features for improving the performance of estimation models.

TL;DR: In this article, X-ray fluorescence analysis has been performed in wheat grains from a field trial where some biofortified and non-biofortified wheat varieties were subjected to Zn biofortification through soil fertilizer application.

TL;DR: In this article, the authors used a simple, fast, "green" and low-cost method to synthetize silver nanoparticles by using coffee extract as reducing agents for a silver nitrate solution.

TL;DR: In this paper, the effect of material properties, laser fluence, ambient gas, and ambient pressure on laser-metal ablation was investigated through series of experiments, where a 1064-nm, 6-ns Nd:YAG laser was used to ablate 1mm thick metal targets with laser energy ranging from 2mJ to 300mJ.

TL;DR: In this article, the feasibility of the calibration free method on stand-off LIBS spectra has been tested and the quantitative analysis was performed on samples of two well-known meteorites, Toluca (iron meteorite) and Sahara 98222 (L6 chondrite) by using a standoff configuration at a distance of 5

TL;DR: In this article, the authors investigated matrix effects and spectral interferences on example of lead determination in different types of soils by laser induced breakdown spectroscopy (LIBS), and compared analytical performances of univariate and multivariate calibrations with the use of different laser wavelength for ablation (532, 355 and 266nm) have been reported.

TL;DR: A laser-induced breakdown spectroscopy (LIBS) system was combined with a bead-on-plate Tungsten Inert Gas (TIG) welding process for the in situ measurement of chemical compositions in austenitic stainless steels during welding as mentioned in this paper.

TL;DR: In this paper, a novel adsorbent, graphene oxide modified with 2,2′-iminodiacetic acid (GO-IDA), was synthesized by nucleophilic substitution of dimethyl-2,2''-IMINodiacetate hydrochloride to the surface of graphene oxide (GO).