scholarly journals Simple and efficient method for detection of traces of rare earth elements in minerals by raman spectroscopy instrumentation

2011 ◽  
Vol 30 (2) ◽  
pp. 241 ◽  
Author(s):  
Petre Makreski ◽  
Gligor Jovanovski* ◽  
Tomče Runčevski ◽  
Radojko Jaćimović
Keyword(s):  
Raman Spectroscopy ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Spectroscopic Method ◽  
Analytical Techniques ◽  
Abundance Distribution ◽  
Raman Spectroscopic ◽  
Spectroscopy Instrumentation ◽  
Modern Analytical ◽  
Ft Raman

As an effort to increase the knowledge about the abundance, distribution and geochemical behaviorof the rare earth elements (REEs), a simple and effective Raman spectroscopic method for detection of REEsin minerals is proposed. The proposed method based on Raman spectroscopy provides a lower detectionlimit for REEs compared to the modern analytical techniques. It could be practiced even in laboratoriesequipped only with FT-Raman instrumentation. This simple, inexpensive, rapid and straightforward Ramanmethod for REEs detection in minerals is a convenient experiment for undergraduate and postgraduatelaboratory courses.

scholarly journals Identification and Detection of Finasteride Polymorphs in Finasteride Tablets by FT-Raman Spectroscopy

2020 ◽  
Vol 32 (8) ◽  
pp. 1865-1868
Author(s):  
M. Chandra Sekhara Rao ◽  
R. Chenna Krishna Reddy ◽  
K.B. Chandra Sekhar ◽  
Y.V. Rami Reddy
Keyword(s):  
Raman Spectroscopy ◽  
Dosage Form ◽  
Spectroscopic Method ◽  
Weight Fraction ◽  
Polymorphic Form ◽  
Raman Spectroscopic ◽  
Solid Dosage ◽  
Ft Raman Spectroscopy ◽  
Tablet Preparation ◽  
Ft Raman

A simple FT-Raman spectroscopic method was developed for identification of finasteride polymorph form in finished dosage form. Finasteride polymorph form I was used in the tablet preparation and the weight fraction of finasteride in tablet was only about 0.023. The method was successfully used to identify the polymorphic form of finasteride in tablet and also to detect up to a level of about 15% of the other polymorph of finasteride present in the solid dosage. The dosage form was characterized by different techniques i.e. powdered X-ray diffraction, infrared spectroscopy and Raman spectroscopy. Based on literature survey, only Raman spectroscopy method is able to identify the polymorph of finasteride in dosage form.

scholarly journals Leaching of Rare Earth Elements from Central Appalachian Coal Seam Underclays

Minerals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 577
Author(s):  
Scott N. Montross ◽  
Jonathan Yang ◽  
James Britton ◽  
Mark McKoy ◽  
Circe Verba
Keyword(s):  
Rare Earth ◽  
Coal Seam ◽  
Rare Earth Elements ◽  
Chelating Agent ◽  
Analytical Techniques ◽  
Leach Solution ◽  
Alternative Source ◽  
Waste Products ◽  
Energy Applications ◽  
Sequential Digestion

Rare earth elements (REE) are necessary for advanced technological and energy applications. To support the emerging need, it is necessary to identify new domestic sources of REE and technologies to separate and recover saleable REE product in a safe and economical manner. Underclay rock associated with Central Appalachian coal seams and prevalent in coal utilization waste products is an alternative source of REE to hard rock ores that are mainly composed of highly refractory REE-bearing minerals. This study utilizes a suite of analytical techniques and benchtop leaching tests to characterize the properties and leachability of the coal seam underclays sampled. Laboratory bench-top and flow-through reactor leaching experiments were conducted on underclay rock powders to produce a pregnant leach solution (PLS) that has relatively low concentrations of gangue elements Al, Si, Fe, and Th and is amenable to further processing steps to recover and produce purified REE product. The leaching method described here uses a chelating agent, the citrate anion, to solubilize elements that are adsorbed, or weakly bonded to the surface of clay minerals or other mineral solid phases in the rock. The citrate PLS produced from leaching specific underclay powders contains relatively higher concentrations of REE and lower concentrations of gangue elements compared to PLS produced from sequential digestion using ammonium sulfate and mineral acids. Citrate solution leaching of underclay produces a PLS with lower concentrations of gangue elements and higher concentrations of REE than achieved with hydrochloric acid or sulfuric acid. The results provide a preliminary assessment of the types of REE-bearing minerals and potential leachability of coal seam underclays from the Central Appalachian basin.

FT-Raman Spectroscopic Study of Decorated Stained Glass

1998 ◽  
Vol 52 (5) ◽  
pp. 679-682 ◽  
Author(s):  
H. G. M. Edwards ◽  
J. K. F. Tait
Keyword(s):  
Raman Spectroscopy ◽  
Fourier Transform ◽  
19Th Century ◽  
Potential Application ◽  
Stained Glass ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Two Samples ◽  
Ft Raman Spectroscopy ◽  
Ft Raman

Two samples of decorated stained glass (14th century and 19th century) from Southwell Minster, Nottinghamshire, U.K. have been examined with the use of Fourier transform (FT)-Raman spectroscopy. The pigment used in both cases has been identified as red ochre, and the potential application of FT-Raman spectroscopy to an important area of conservation and restoration of glass artifacts is demonstrated.

Raman Spectroscopic Studies of Amsacrine

1992 ◽  
Vol 46 (10) ◽  
pp. 1540-1544 ◽  
Author(s):  
Catherine A. Butler ◽  
Ralph P. Cooney ◽  
William A. Denny
Keyword(s):  
Crystal Structure ◽  
Raman Spectroscopy ◽  
Crystal Structure Data ◽  
Visible Spectrum ◽  
Spectroscopic Studies ◽  
Resonance Raman Spectrum ◽  
Raman Spectroscopic ◽  
Ft Raman Spectroscopy ◽  
Uv Visible ◽  
Ft Raman

Amsacrine (4′-(9-acridinylamino)methanesulfon- m-anisidide) in both solid and aqueous forms was characterized with the use of resonance and nonresonance Raman spectroscopy (including FT-Raman spectroscopy). Evidence that the acridine nucleus is the dominant chromophoric unit contributing to the resonance Raman spectrum is based upon the apparent similarities of the spectra of aqueous amsacrine (in the unpro-tonated form) and acridine (in ethanol). The probable non-coplanarity of the acridine and phenyl units in the amsacrine molecule (based on previously reported crystal structure data) is consistent with the suggestion that the acridine nucleus may constitute an independent chromophoric unit. Further evidence is derived from analysis of the UV-visible spectrum, which indicates that excitation at 457.9 nm falls within an electronic transition of the acridine nucleus of amsacrine. The excitation profiles of aqueous amsacrine are presented, and four types of profiles have been identified.

Dispersive and FT-Raman spectroscopic methods in food analysis

RSC Advances ◽  
2015 ◽  
Vol 5 (70) ◽  
pp. 56606-56624 ◽  
Author(s):  
Ismail Hakki Boyaci ◽  
Havva Tümay Temiz ◽  
Hüseyin Efe Geniş ◽  
Esra Acar Soykut ◽  
Nazife Nur Yazgan ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Molecular Analysis ◽  
Food Analysis ◽  
Food Samples ◽  
Spectroscopic Methods ◽  
Raman Spectroscopic ◽  
Powerful Technique ◽  
Ft Raman

Raman spectroscopy is a powerful technique for molecular analysis of food samples.

scholarly journals Stabilization of rare earth elements (La, Nd, Pr, Ce) by ZrO2 concentrate

2018 ◽  
pp. 39-45
Author(s):  
V. B. Kul'metyeva ◽  
S. E. Porozova ◽  
V. G. Gilev ◽  
D. S. Vokhmyanin
Keyword(s):  
Thermal Analysis ◽  
Raman Spectroscopy ◽  
Differential Thermal Analysis ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Phase Transformations ◽  
Tetragonal Phase ◽  
Cubic Phases

The effect of annealing and sintering temperatures on the phase transformations of ZrO2was studied depending on the content of REE concentrate using differential thermal analysis, Raman spectroscopy andX-ray diffraction. It is shown that the introduction of REE concentrate in an amount of more than 15 wt. % stabilizes the tetragonal phase of ZrO2only at temperatures below 1200 °C. A further increase in temperature leads to destabilization of the tetragonal phase with the formation of the monoclinic and cubic phases of theLn2Zr2O7type isostructural compounds (n= La, Nd, ...) with the pyrochlore structure.Ill. 8. Ref. 19. Tab. 1.

FT Raman Spectroscopy as a Tool for Characterization of Derivatized Silica Gel Sorbents

2005 ◽  
Vol 70 (2) ◽  
pp. 168-177
Author(s):  
Zuzana Tománková ◽  
Pavel Matějka ◽  
Karel Volka ◽  
Vladimír Král
Keyword(s):  
Raman Spectroscopy ◽  
Silica Gel ◽  
Stationary Phases ◽  
Amide Bonds ◽  
Raman Spectroscopic ◽  
Ft Raman Spectroscopy ◽  
Trimethylsilyl Groups ◽  
Ft Raman

The potential of Fourier-transform (FT) Raman spectroscopy for verification of individual steps of synthesis of new chromatographic stationary phases was studied. 3-Aminopropylated silica gel was modified with two different optically active compounds ((+)-cloprostenol, (+)-(R)-2,2'-dihydroxy-1,1'-binaphthalene-3-carboxylic acid) via amide bonds. In the next step, free silanol groups were protected with trimethylsilyl groups. The FT Raman spectroscopic results compared with the data obtained by elemental analysis enable not only qualitative verification of synthetic steps, but also a semiquantitative determination of covering of the silica gel surface by derivatization agent.

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