Study of matrix effects on rare earth elements in hollow cathode discharges

1992 ◽  
Vol 7 (7) ◽  
pp. 1121 ◽  
Author(s):  
Jerzy Mierzwa ◽  
Wies?aw Zyrnicki
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Hollow Cathode ◽  
Matrix Effects

Rare-Earth Analysis by a Rotating Platform, Silver-Spark Technique

1968 ◽  
Vol 22 (5) ◽  
pp. 558-561
Author(s):  
Theodore R. Lyon
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Electrode Material ◽  
Matrix Effects ◽  
Small Samples ◽  
Good Sensitivity ◽  
Rotating Platform

A rotating platform, silver-spark technique has been adapted for analysis of rare-earth elements directly, either as solutions or after coprecipitation with a carrier. The platform sample electrode is compared with the rod sample electrode conventionally used, and silver is shown to provide some advantages over copper as an electrode material. Observations are reported on conditions pertaining to the preparation and excitation of samples. Three varied applications of the method are briefly described, and matrix effects are discussed. Platform electrodes are found to be more convenient and adaptable than conventional rods, and the sensitivity of the method is comparable to the copper-spark method for small samples. When larger samples are used, the sensitivity decreases; however, good sensitivity can be obtained by properly selecting conditions or equipment.

scholarly journals Detection of Rare Earth Elements in Minerals and Soils by Laser-Induced Breakdown Spectroscopy (LIBS) Using Interval PLS

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1379
Author(s):  
Nina Rethfeldt ◽  
Pia Brinkmann ◽  
Daniel Riebe ◽  
Toralf Beitz ◽  
Nicole Köllner ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Matrix Effects ◽  
Principal Component ◽  
Laser Induced Breakdown Spectroscopy ◽  
Regression Methods ◽  
Breakdown Spectroscopy ◽  
Field Samples ◽  
Laser Induced Breakdown

The numerous applications of rare earth elements (REE) has lead to a growing global demand and to the search for new REE deposits. One promising technique for exploration of these deposits is laser-induced breakdown spectroscopy (LIBS). Among a number of advantages of the technique is the possibility to perform on-site measurements without sample preparation. Since the exploration of a deposit is based on the analysis of various geological compartments of the surrounding area, REE-bearing rock and soil samples were analyzed in this work. The field samples are from three European REE deposits in Sweden and Norway. The focus is on the REE cerium, lanthanum, neodymium and yttrium. Two different approaches of data analysis were used for the evaluation. The first approach is univariate regression (UVR). While this approach was successful for the analysis of synthetic REE samples, the quantitative analysis of field samples from different sites was influenced by matrix effects. Principal component analysis (PCA) can be used to determine the origin of the samples from the three deposits. The second approach is based on multivariate regression methods, in particular interval PLS (iPLS) regression. In comparison to UVR, this method is better suited for the determination of REE contents in heterogeneous field samples.

A Combined Dilution and Line-Overlap Coefficient Solution for the Determination of Rare Earths in Monazite Concentrates

1981 ◽  
Vol 25 ◽  
pp. 133-137
Author(s):  
T. K. Smith
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Atomic Number ◽  
Rare Earths ◽  
Microprobe Analysis ◽  
Matrix Effects ◽  
Emission Spectra ◽  
X Ray ◽  
Overlap Coefficient

The rare earth elements (REE) together give guite complex X-ray emission spectra with a considerable number of overlaps at analytical energies by lines of other REE with lower atomic numbers. Where the concentration of REE is high, as in lanthanide minerals, this Interference is more difficult to rectify. Smith and Gold resolved a similar problem with lower atomic number elements in energy dispersive microprobe analysis by establishing a series of overlap coefficients. They asserted that accurate corrections were necessary because of the relatively poor overall resolution of the instrument and that these should not be limited to the major coincidences. Some of the smaller values had probably been ignored because they were considered statistically Insignificant. The mathematical matrix of Smith and Gold covered 22 elements from fluorine to barium, with intensity coefficients (other than intraelement) quoted from 0.01% to 282.1% and with ZAF corrections necessary in cases of K to L conversion. The overlap coefficients were also adjusted for matrix effects.

scholarly journals ESPECTROSCOPIA OPTOGALVÂNICA DE ÉRBIO OPTOGALVANIC SPECTROSCOPY OF ERBIUM

2017 ◽  
Vol 38 (1) ◽  
pp. 85
Author(s):  
Patricia Bueno ◽  
Maria Esther Sbampato ◽  
José Wilson Neri ◽  
Luiz Felipe Nardin Barreta ◽  
Jhonatha Ricardo Dos Santos ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Hollow Cathode ◽  
Isotope Separation ◽  
Science And Technology ◽  
Spectroscopy Technique ◽  
Hollow Cathode Lamp ◽  
Optogalvanic Spectroscopy ◽  
The Rare Earth

The rare earth elements have been creating a large interest due to their applications in several areas of science and technology. This paper presents some spectra obtained by the optogalvanic spectroscopy technique with an erbium hollow cathode lamp, in order to gather information about the atom, necessary for the isotope separation.

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