Rubidium in the elemental composition of Brazilian coffee

2018 ◽  
Vol 28 (01n02) ◽  
pp. 35-42
Author(s):  
Rafaela Debastiani ◽  
Livio Amaral ◽  
Johnny Ferraz Dias
Keyword(s):  
Trace Element ◽  
Elemental Composition ◽  
Elemental Analysis ◽  
Major Elements ◽  
X Ray ◽  
Ground Coffee

In this paper, a Brazilian roasted ground coffee from a popular brand was analyzed using particle-induced X-ray emission (PIXE). The elemental analysis identified elements such as Mg, Al, Si, P, S, K, Ca, Ti, Mn, Fe, Cu, Zn and Rb. While K, Mg and P are major elements, Mn, Fe, Zn and Rb were found in trace amounts. The presence of rubidium as a trace element in the samples is discussed in view of its presence in Brazilian coffee, soil and other beverages.

Automatic Data Acquisition and Reduction for Elemental Analysis of Aerosol Samples

1973 ◽  
Vol 17 ◽  
pp. 560-570 ◽  
Author(s):  
J. F. Harrison ◽  
R. A. Eldred
Keyword(s):  
Energy Spectrum ◽  
Data Collection ◽  
Data Acquisition ◽  
Elemental Composition ◽  
Elemental Analysis ◽  
Correlation Technique ◽  
Control Data ◽  
Automatic Data ◽  
X Ray ◽  
Automatic Data Acquisition

AbstractA PDF 15/40 computer wich ADC and CAMAC interfaces is used to control data collection apparatus, acquire data, and reduce data to determine the elemental composition of aerosol samples. The background is subtracted from each energy spectrum, peak centers are located automatically using a Gaussian correlation technique, peak multiplets are resolved with Gaussian fits, peak energies are compared with entries in a table of x-ray lines for possible identification, multiple identification of peaks and line interferences are resolved, and the elemental amounts are determined from the areas of the Gaussian fits.

Phase Identification and Mapping Based on Valence Loss EELS and ELNES

2009 ◽  
Vol 17 (3) ◽  
pp. 16-19
Author(s):  
R.D. Twesten
Keyword(s):  
Electronic Structure ◽  
Energy Loss ◽  
Elemental Composition ◽  
Elemental Analysis ◽  
Core Loss ◽  
Core Shell ◽  
Phase Identification ◽  
X Ray ◽  
Response Information ◽  
Electron Energy Loss

Much of analytical TEM is based on elemental analysis of core-shell ionizations and their role in electron energy-loss spectroscopy (EELS) and energy-dispersive X-ray spectroscopy (EDS). In these techniques, integrals of the primary or secondary ionization signals (typically over many tens of eV in energy) are used to measure and map the elemental composition of probed sample areas.In contrast, present-day STEM EELS systems are able to reveal spectral details with resolution in the range 0.1-1.0 eV. This means that EELS provides access to electronic structure and response information that goes beyond the simple elemental composition information of the integrated core-loss signals.

scholarly journals Review on Mineral Characterization of Precambrian Charnockites – using PIXE Technique

2020 ◽  
Author(s):  
Avupati Venkata Surya Satyanarayana ◽  
Mokka Jagannadharao ◽  
Kemburu Chandra Mouli ◽  
Kollu Sai Satya Mounika
Keyword(s):  
Long Range ◽  
Elemental Analysis ◽  
Major Elements ◽  
Analytical Tool ◽  
Trace Elemental Analysis ◽  
X Ray ◽  
Trace Elemental ◽  
Mineral Characterization ◽  
Non Destructive

Abstract. Particle Induced X-ray Emission (PIXE) has been applied to a analytical tool for long range of major, minor and trace elemental analysis in Precambrian charnockites. PIXE is sensitive and non-destructive method for some elemental analysis in a variety of Precambrian charnockite rocks down to levels of a few parts per million and it is not valid for all remaining elements in the composition. The elements identified in the Precambrian charnokite rock are Cl, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Se, Br, Rb, Sr, Y, Zr, Nb, Mo, Ru, Ag, Pb are identified without exact values by PIXE but the elements minor F, major elements Na, Mg, Al, Si, P and Ba and traces of Co, Th and U not detected due to various reasons even though there present in the charnockites, because of PIXE which is operation at 3 MeV energy and characterization material of charnockite mineral investigated. In mineral characterization of charnockite rocks, elemental errors in concentration of the compositions explained by comparing with present and previous studies.

Serendipity: Werner's argument that the `two-only forms' (green and violet) of [CoCl2(en)2]+ salts demanded his octahedral model was correct. True?

2020 ◽  
Vol 76 (3) ◽  
pp. 298-301 ◽  
Author(s):  
Ivan Bernal ◽  
Roger A. Lalancette
Keyword(s):  
Crystal Structure ◽  
Elemental Composition ◽  
19Th Century ◽  
Elemental Analysis ◽  
Asymmetric Unit ◽  
X Ray Diffraction ◽  
Late 19Th Century ◽  
X Ray ◽  
The Third ◽  
Alfred Werner

Chemists of the late 19th century, including Alfred Werner, prepared salts containing either green or violet cations of composition [CoCl2(en)2]+ (en is ethylenediamine, C2H8N2); we now refer to these as trans-dichloro and cis-dichloro species. We have discovered a third salt, purple in color, containing cations of the same elemental composition and whose asymmetric unit composition is [CoCl2(en)2]2Cl2·3H2O, in which the cobalt cations are a cis:trans dichloro pair. Such a discovery would undermine Werner's argument that if only two forms can be prepared, his octahedral theory was proven. Probably because his students never examined their crystals under a microscope, they failed to observe the `third' species, thereby ruining Werner's argument since he relied strictly on color to identify them. That was fortunate since our purple salt would have led him to abandon, or certainly delay, his momentous discovery. Our crystals consist of a 1:1 mixture of the cis and trans cations, thereby sharing the same elemental analysis and conductivity as the single salts, but not their crystal structure, inasmuch as X-ray diffraction had not even been discovered then. Serendipitously, our discovery would have been a great boon to his theoretical acumen, while his `two-color' argument may have doomed him.

Quantitative elemental analysis of bovine ovarian follicles using X-ray fluorescence imaging

Metallomics ◽  
2015 ◽  
Vol 7 (5) ◽  
pp. 828-836 ◽  
Author(s):  
M. J. Ceko ◽  
K. Hummitzsch ◽  
N. Hatzirodos ◽  
R. J. Rodgers ◽  
H. H. Harris
Keyword(s):  
Trace Element ◽  
Fluorescence Imaging ◽  
Elemental Analysis ◽  
Ovarian Follicles ◽  
Element Distribution ◽  
Trace Element Distribution ◽  
X Ray ◽  
Quantitative Elemental Analysis ◽  
Biological Structures

Highlights how quantitative XRF can differentiate between biological structures in bovine ovaries on the basis of trace element distribution alone.

Trace Element Analysis of Rocks by X-ray Spectrometry

1990 ◽  
Vol 34 ◽  
pp. 263-276 ◽  
Author(s):  
Bruce W. Chappell
Keyword(s):  
Trace Element ◽  
Trace Element Analysis ◽  
Major Elements ◽  
Good Precision ◽  
Powerful Method ◽  
Element Analysis ◽  
X Ray ◽  
Advantages And Disadvantages ◽  
Wide Range ◽  
Unique Method

Undoubtedly the most important applications of X-ray fluorescence spectrometry (XRF) have been in the analysis of major elements where the technique provides a unique method of measuring the concentration of all elements having Z > 10 with extremely good precision in a wide range of matrices. However, XRF is in addition a powerful method for trace element analysis. In this discussion, the principles of the method for the trace element analysis of rocks are outlined, its capabilities are summarized, and the advantages and disadvantages of the technique are pointed out.

scholarly journals ELEMENTAL ANALYSIS OF THE ANCIENT BRONZE COINS BY X-RAY FLUORESCENCE TECHNIQUE USING SIMULTANEOUSLY RADIOISOTOPE SOURCE AND X-RAY TUBE

2007 ◽  
Vol 14 (1) ◽  
pp. 50 ◽  
Author(s):  
NGUYEN THE QUYNH ◽  
TRUONG THI AN ◽  
TRAN DUC THIEP ◽  
NGUYEN DINH CHIEN ◽  
DAO TRAN CAO ◽  
...  
Keyword(s):  
Elemental Composition ◽  
19Th Century ◽  
Elemental Analysis ◽  
Fluorescence Technique ◽  
Interesting Point ◽  
X Ray ◽  
Radioisotope Source ◽  
The Difference ◽  
Fluorescence Spectrometer ◽  
The 19Th Century

The results on elemental analysis of the vietnamese ancient bronze coins during the time of the Nguyen dynasty (19th century) are presented. The samples were provided by the Vietnam National Historical Museum and the elemental analysis was performed on the home-made model EDS-XT-99-01 X-ray fluorescence spectrometer in the Institute of Materials Science, NCST of Vietnam. The samples exited simultaneously by radioisotope source and X-ray tube. The analytical results show the similarity in the elemental composition of the coins issued by different kings of the Nguyen dynasty, but there is the difference in the concentration of the used elements. Another interesting point is that all the coins have zinc (Zn) in their composition, which shows clearly the influence of the occidental metallurgical technology on the money-making technique in Vietnam during the 19th century.

An Elemental Analysis of Different CD-R discs

2014 ◽  
Vol 5 (1) ◽  
pp. 752-756
Author(s):  
Amir Pishkoo
Keyword(s):  
Trace Elements ◽  
Elemental Analysis ◽  
Rutherford Backscattering Spectrometry ◽  
Major And Trace Elements ◽  
Major Elements ◽  
Rutherford Backscattering ◽  
X Ray ◽  
Non Destructive ◽  
Non Destructive Techniques

In this study Proton Induced X-ray Emission (PIXE) and Rutherford Backscattering Spectrometry (RBS) as reliable and non-destructive techniques has been applied to compare thickness, major and trace elements of different brands of CD-R discs. Three elements, namely Ag, Ba, and Ti were found to be the major elements.

Elemental Analysis of Geological Samples Using a Multichannel, Simultaneous X-Ray Spectrometer

1982 ◽  
Vol 26 ◽  
pp. 451-456
Author(s):  
J. B. Cross ◽  
L. V. Wilson
Keyword(s):  
Sample Preparation ◽  
Elemental Analysis ◽  
Trace Element Analysis ◽  
Major Elements ◽  
Geological Samples ◽  
Element Analysis ◽  
X Ray ◽  
Large Numbers ◽  
Key Factor

X-ray spectrometry has been used successfully for major and trace element analysis of geological samples (e.g. reference 1). Its advantage is providing accurate and precise results in a rapid manner: a key factor in selecting analytical methods for mineralogical studies involving large numbers of samples. All elements with atomic numbers greater than 9 (fluorine), except noble gases, can be determined with sensitivities ranging down to ppm levels.The analytical method described in this report is for the determination of the major elements (i.e. Na, Mg, Al, Si, P, K, Ca, Ti, Mn and Fe) in geological samples. Commercially available automated fusion devices are used for sample preparation.

Elemental Analysis of Biomedical Samples by Pixe

1977 ◽  
Vol 21 ◽  
pp. 261-266
Author(s):  
J. A. Guffey ◽  
H. A. Van Rinsvelt ◽  
W. R. Adams ◽  
R. M. Sarper ◽  
Z. Karcioglu ◽  
...  
Keyword(s):  
Trace Elements ◽  
Early Detection ◽  
Trace Element ◽  
Elemental Analysis ◽  
Diagnostic Tool ◽  
Trace Element Analysis ◽  
Analytical Tool ◽  
Element Analysis ◽  
Pixe Analysis ◽  
X Ray

The use of particle-induced X-ray emission (PIXE) analysis as a standard analytical tool in the study of trace elements is well known. In the present investigation, an attempt is made to correlate human diseases with the presence or absence of trace elements and/or the changes in their concentration in healthy and diseased tissues. If such correlations do actually exist, trace element analysis could certainly be used as a diagnostic tool for the early detection of diseases and there is considerable interest in such information.

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