Evaluation of micro-energy dispersive X-ray fluorescence spectrometry for the analysis of plant materials

Guerra, Marcelo Braga Bueno; Schaefer, Carlos E. G. R.; Carvalho, Gabriel Gustinelli Arantes de; Souza, Paulino Florêncio de; Júnior, Dário Santos; Nunes, Lidiane Cristina; Krug, Francisco José

doi:10.1039/c3ja50084e

Cited by 25 publications

(4 citation statements)

References 57 publications

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“…From the spectrum for KTO NA emerges two new peaks at 0.52 and 3.31 K eV, which can be indexed to the Kα peaks of O and K, respectively. 33,34 After converting to CTO NA via an ion exchange reaction, however, the peaks corresponding to K vanish while new peaks of Co Lα (0.78 keV) and Co Kα (6.92 keV) are seen, 35 further confirming that K + in KTO NA is replaced by Co 2+ . The EDS results are in good agreement with those of the XPS measurements.…”

Section: Resultsmentioning

confidence: 84%

Ion Exchange Synthesis of Cobalt Ion Modified Titanate Nanoarray as an Electrocatalyst toward Efficient Hydrogen Evolution Reaction

Zhao

Zhang

et al. 2019

ACS Appl. Energy Mater.

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Cobalt ion modified titanate nanoarray (CTO NA) with a three-dimensional hierarchical structure is synthesized via a facile ion exchange strategy and further developed as an electrocatalyst toward efficient hydrogen evolution reaction (HER). In 0.1 M KOH solution, CTO NA exhibits a low Tafel slope of 93 mV dec −1 and a small overpotential of 199 mV at a current density of 10 mA cm −2 as well as high electrochemical stability for HER. The superior electrocatalytic performance of CTO NA is attributed to the unique chemical composition and layered crystal structure for improved electrode kinetics. Meanwhile, the three-dimensional hierarchical morphology of CTO NA also contributes to fast charge transfer and greatly enhanced mass transport in electrochemical reaction. This work holds a great promise for the as-prepared CTO NA to be an alternative for the noble metals based catalysts toward large scale hydrogen production via water electrolysis.

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Section: Resultsmentioning

confidence: 84%

Ion Exchange Synthesis of Cobalt Ion Modified Titanate Nanoarray as an Electrocatalyst toward Efficient Hydrogen Evolution Reaction

Zhao

Zhang

et al. 2019

ACS Appl. Energy Mater.

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“…The screening and selection of genotypes with potential for bioremediation can be carried out through in vitro studies ( Nehnevajova et al, 2007 ; Doran, 2009 ; Di Lonardo et al, 2011 ). The determination of the spatial distribution of elements can show possible synergism or antagonism between the potentially toxic elements that one intends to remove from soil and the mineral nutrients in the plant ( Bueno Guerra et al, 2013 ). Imaging techniques can be used to evaluate such interactions ( Campos et al, 2015 ).…”

Section: Resultsmentioning

confidence: 99%

Laboratory Microprobe X-Ray Fluorescence in Plant Science: Emerging Applications and Case Studies

et al. 2018

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In vivo and micro chemical analytical methods have the potential to improve our understanding of plant metabolism and development. Benchtop microprobe X-ray fluorescence spectroscopy (μ-XRF) presents a huge potential for facing this challenge. Excitation beams of 30 μm and 1 mm in diameter were employed to address questions in seed technology, phytopathology, plant physiology, and bioremediation. Different elements were analyzed in several situations of agronomic interest: (i) Examples of μ-XRF yielding quantitative maps that reveal the spatial distribution of zinc in common beans (Phaseolus vulgaris) primed seeds. (ii) Chemical images daily recorded at a soybean leaf (Glycine max) infected by anthracnose showed that phosphorus, sulfur, and calcium trended to concentrate in the disease spot. (iii) In vivo measurements at the stem of P. vulgaris showed that under root exposure, manganese is absorbed and transported nearly 10-fold faster than iron. (iv) Quantitative maps showed that the lead distribution in a leaf of Eucalyptus hybrid was not homogenous, this element accumulated mainly in the leaf border and midrib, the lead hotspots reached up to 13,400 mg lead kg-1 fresh tissue weight. These case studies highlight the ability of μ-XRF in performing qualitative and quantitative elemental analysis of fresh and living plant tissues. Thus, it can probe dynamic biological phenomena non-destructively and in real time.

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“…The investigated objects were examined using a Bruker ® (Billerica, MA, USA) M4 Tornado micro X-ray fluorescence (µXRF) benchtop spectrometer equipped with an Rh tube, operating at 50 kV, 500 µA, and spot 25 µm obtained with polycapillary optics, as well as with a XFlash ® detector providing an energy resolution better than 145 eV (at Mn Kα) and five filters [20,21]. Spectrum energy calibration was performed daily before each analysis by using zirconium (Zr) metal (Bruker ® calibration standard).…”

Section: Xrf Mappingmentioning

confidence: 99%

μXRF Mapping as a Powerful Technique for Investigating Metal Objects from the Archaeological Site of Ferento (Central Italy)

et al. 2020

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This research concerns the application of micro X-ray fluorescence (µXRF) mapping to the investigation of a group of selected metal objects from the archaeological site of Ferento, a Roman and then medieval town in Central Italy. Specifically, attention was focused on two test pits, named IV and V, in which metal objects were found, mainly pertaining to the medieval period and never investigated before the present work from a compositional point of view. The potentiality of µXRF mapping was tested through a Bruker Tornado M4 equipped with an Rh tube, operating at 50 kV, 500 μA, and spot 25 μm obtained with polycapillary optics. Principal component analysis (PCA) and multivariate curve resolution (MCR) were used for processing the X-ray fluorescence spectra. The results showed that the investigated items are characterized by different compositions in terms of chemical elements. Three little wheels are made of lead, while the fibulae are made of copper-based alloys with varying amounts of tin, zinc, and lead. Only one ring is iron-based, and the other objects, namely a spatula and an applique, are also made of copper-based alloys, but with different relative amounts of the main elements. In two objects, traces of gold were found, suggesting the precious character of these pieces. MCR analysis was demonstrated to be particularly useful to confirm the presence of trace elements, such as gold, as it could differentiate the signals related to minor elements from those due to major chemical elements.

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Evaluation of micro-energy dispersive X-ray fluorescence spectrometry for the analysis of plant materials

Cited by 25 publications

References 57 publications

Ion Exchange Synthesis of Cobalt Ion Modified Titanate Nanoarray as an Electrocatalyst toward Efficient Hydrogen Evolution Reaction

Ion Exchange Synthesis of Cobalt Ion Modified Titanate Nanoarray as an Electrocatalyst toward Efficient Hydrogen Evolution Reaction

Laboratory Microprobe X-Ray Fluorescence in Plant Science: Emerging Applications and Case Studies

μXRF Mapping as a Powerful Technique for Investigating Metal Objects from the Archaeological Site of Ferento (Central Italy)

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