scholarly journals Quantification of Solute Composition in H2O-NaCl-CaCl2 Solutions Using Cryogenic 2D Raman Mapping

Minerals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1043
Author(s):  
Haixia Chu ◽  
Guoxiang Chi ◽  
Chunji Xue
Keyword(s):  
Raman Spectroscopy ◽  
Quantitative Analysis ◽  
Fluid Inclusions ◽  
Molar Fraction ◽  
Mapping Technique ◽  
Raman Mapping ◽  
Point Analysis ◽  
Single Inclusion ◽  
Solute Composition ◽  
Non Destructive

Various analytical techniques have been developed to determine the solution composition of fluid inclusions, including destructive, non-destructive, single-inclusion, and bulk-inclusion methods. Cryogenic Raman spectroscopy, as a non-destructive and single-inclusion method, has emerged as a potentially powerful tool of quantitative analysis of fluid inclusion composition. A method of point analysis using cryogenic Raman spectroscopy has been previously proposed to quantitatively estimate the solute composition of H2O-NaCl-CaCl2 solutions, but there are uncertainties related to heterogeneity of frozen fluid inclusions and potential bias in the processing of Raman spectra. A new method of quantitative analysis of solute composition of H2O-NaCl-CaCl2 solutions using Raman mapping technology is proposed in this study, which can overcome the problems encountered in the point analysis. It is shown that the NaCl/(NaCl + CaCl2) molar ratio of the solution, X(NaCl, m), can be related to the area fraction of hydrohalite over hydrohalite plus antarcticite, Fhydrohalite, by the equation X(NaCl, m) = 1.1435 Fhydrohalite − 0.0884, where Fhydrohalite = hydrohalite area/(hydrohalite area + antarcticite area). This equation suggests that the molar fraction of a salt component may be estimated from the fraction of the Raman peak area of the relevant hydrate. This study has established a new way of estimating solute composition of fluid inclusions using cryogenic Raman mapping technique, which may be extended to other solutions.

Quantitative analysis and measurement of carbon isotopic compositions in individual fluid inclusions by micro-laser Raman spectrometry

2016 ◽  
Vol 8 (37) ◽  
pp. 6730-6738 ◽  
Author(s):  
Jiajia Li ◽  
Rongxi Li ◽  
Bangsheng Zhao ◽  
Ning Wang ◽  
Jinghua Cheng
Keyword(s):  
Raman Spectroscopy ◽  
Quantitative Analysis ◽  
Fluid Inclusions ◽  
Laser Raman Spectroscopy ◽  
Raman Spectrometry ◽  
Laser Raman ◽  
Isotopic Compositions ◽  
Carbon Isotopic ◽  
Non Destructive

Micro-laser Raman spectroscopy is a non-destructive technique to quantitatively determine the carbon isotopic compositions of CO2 in individual fluid inclusions.

scholarly journals Cryogenic Raman Spectroscopic Studies on Common Ore-forming Fluid Systems

Minerals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 363
Author(s):  
Dan Yang ◽  
Xin Xiong ◽  
Weishi Chen
Keyword(s):  
Raman Spectroscopy ◽  
Quantitative Analysis ◽  
Correlation Coefficient ◽  
Fluid Inclusions ◽  
Intensity Ratio ◽  
Spectroscopic Studies ◽  
Ore Deposits ◽  
Raman Spectroscopic ◽  
Freezing Method ◽  
Fluid Systems

The composition and properties of ore-forming fluids are key to understanding the mechanisms of mineralization in ore deposits. These characteristics can be understood by studying fluid inclusions. Hydrates in fluid inclusions containing NaCl–H2O and MgCl2–H2O were studied using cryogenic Raman spectroscopy. The intensity ratio of peaks at 3401, 3464, 3514, and 3090 cm−1 shows a positive correlation with the concentration of hydrates in the inclusions, as does the ratio of the total integrated area of the MgCl2 hydrate peak (3514 cm−1) to the 3090 cm−1 peak with the concentration of MgCl2 (correlation coefficient >0.90). These correlations are important in the quantitative analysis of MgCl2 in synthetic and natural NaCl–MgCl2–CaCl2–H2O-bearing fluid inclusions. Semi-quantitative analysis of NaCl–MgCl2–H2O solutions indicates that peaks at 3437 and 3537 cm−1 reflect the presence of NaCl in the solution. Further, a peak at 3514 cm−1 is indicative of the presence of MgCl2. The relative intensities of these peaks may be related to the relative abundances of NaCl and MgCl2. A quantitative attempt was made on NaCl–MgCl2–CaCl2–H2O system, but it was found that quantifying NaCl, MgCl2 and CaCl2 separately in NaCl–MgCl2–CaCl2–H2O system by the secondary freezing method is difficult.

Characterization of Ni- and Ni(Pt)-Silicide Formation on Narrow Polycrystalline Si Lines by Raman Spectroscopy

1999 ◽  
Vol 591 ◽  
Author(s):  
P. S. Lee ◽  
D. Mangelinck ◽  
K. L. Pey ◽  
J. Ding ◽  
T. Osipowicz ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Raman Spectroscopy ◽  
Raman Mapping ◽  
Silicide Formation ◽  
Nucleation Sites ◽  
The Difference ◽  
The Stability ◽  
Non Destructive ◽  
Thermal Stability Of

ABSTRACTThe formation and thermal stability of Ni- and Ni(Pt) silicide on narrow polycrystalline Si (poly-Si) lines have been investigated using the non-destructive micro-Raman technique. The presence of Ni or Ni(Pt)Si on poly-Si lines with linewidths ranging from 0.5 gtm to 0.25 μm has been monitored by a distinct Raman peak at around 215 cm−1. Ni(Pt)Si was clearly identified to be present up to a RTA temperature of 900°C on narrow poly-Si lines as compared to pure NiSi which was found only up to 750°C. Raman scattering from the 100×100 μm2 poly-Si pads showed the formation of NiSi2 at 750°C for pure Ni-salicidation and 900°C for Ni(Pt)-salicidation respectively. The difference in the stability of NiSi on the poly-Si pads and lines is discussed in terms of agglomeration, inversion and/or nucleation of NiSi2that could be due to difference in nucleation sites and/or stress. In addition, a correlation between the line sheet resistance and the presence of Ni silicide was found using micro-Raman mapping along single poly-Si lines.

In situ quantitative analysis of individual H2O–CO2 fluid inclusions by laser Raman spectroscopy

2007 ◽  
Vol 237 (3-4) ◽  
pp. 255-263 ◽  
Author(s):  
Tristan Azbej ◽  
Matthew J. Severs ◽  
Brian G. Rusk ◽  
Robert J. Bodnar
Keyword(s):  
Raman Spectroscopy ◽  
Quantitative Analysis ◽  
Fluid Inclusions ◽  
Laser Raman Spectroscopy ◽  
Laser Raman

scholarly journals Development of Transmission Raman Spectroscopy towards the in line, high throughput and non-destructive quantitative analysis of pharmaceutical solid oral dose

The Analyst ◽  
2015 ◽  
Vol 140 (1) ◽  
pp. 107-112 ◽  
Author(s):  
Julia A. Griffen ◽  
Andrew W. Owen ◽  
Pavel Matousek
Keyword(s):  
Raman Spectroscopy ◽  
Quantitative Analysis ◽  
Oral Dose ◽  
High Throughput ◽  
Pharmaceutical Tablets ◽  
Transmission Raman ◽  
Non Destructive

Transmission Raman Spectroscopy and photon diode enhancer facilitates faster scanning and quantitative analysis of pharmaceutical tablets.

scholarly journals In situ Raman mapping of art objects

2016 ◽  
Vol 374 (2082) ◽  
pp. 20160039 ◽  
Author(s):  
D. Lauwers ◽  
Ph. Brondeel ◽  
L. Moens ◽  
P. Vandenabeele
Keyword(s):  
Raman Spectroscopy ◽  
Spatial Distribution ◽  
Chemical Information ◽  
Raman Mapping ◽  
In Situ Raman ◽  
Art Objects ◽  
Mapping System ◽  
Non Destructive ◽  
Raman Image

Raman spectroscopy has grown to be one of the techniques of interest for the investigation of art objects. The approach has several advantageous properties, and the non-destructive character of the technique allowed it to be used for in situ investigations. However, compared with laboratory approaches, it would be useful to take advantage of the small spectral footprint of the technique, and use Raman spectroscopy to study the spatial distribution of different compounds. In this work, an in situ Raman mapping system is developed to be able to relate chemical information with its spatial distribution. Challenges for the development are discussed, including the need for stable positioning and proper data treatment. To avoid focusing problems, nineteenth century porcelain cards are used to test the system. This work focuses mainly on the post-processing of the large dataset which consists of four steps: (i) importing the data into the software; (ii) visualization of the dataset; (iii) extraction of the variables; and (iv) creation of a Raman image. It is shown that despite the challenging task of the development of the full in situ Raman mapping system, the first steps are very promising. This article is part of the themed issue ‘Raman spectroscopy in art and archaeology’.

Use of Raman Spectroscopy for the Quantitative Analysis of Calcium Oxalate Hydrates: Application for the Analysis of Urinary Stones

1997 ◽  
Vol 51 (1) ◽  
pp. 64-67 ◽  
Author(s):  
Christos G. Kontoyannis ◽  
Nicolaos Ch. Bouropoulos ◽  
Petros G. Koutsoukos
Keyword(s):  
Raman Spectroscopy ◽  
Quantitative Analysis ◽  
Calcium Oxalate ◽  
Raman Band ◽  
Molar Fraction ◽  
Relative Advantage ◽  
Urinary Stones ◽  
Calcium Oxalate Dihydrate ◽  
Analytical Technique ◽  
Potential Use

The potential use of the Raman spectroscopy (RS) for the quantitative analysis of the mineral components of urinary stones consisting mainly of the mono- and dihydrate salts of calcium oxalate has been demonstrated. The quantitative analysis was based on the construction of calibration curves made of known mixtures of synthetically prepared pure calcium oxalate monohydrate (COM) and calcium oxalate dihydrate (COD). The Raman spectra of well-mixed powdered samples of COM and COD were recorded, and the characteristic bands at 1462 and 1477 cm−1 for COM and COD, respectively, were used as the basis for the quantitative analysis. It was found that xM = ( IR – 0.134)/(0.8 IR + 1.52), where xM is the molar fraction of COM in the solid mixture and IR represents the intensity ratio of the Raman band at 1462 cm−1 to that of 1477 cm−1. The calibration curve was used for the analysis of a typical urinary stone surgically removed, and it was found that xM = 0.33. This finding was confirmed by infrared quantitative spectroscopic analysis. Quantitative analysis using the proposed Raman technique had a detection limit of approximately 0.6 mol % content in COM. The relative advantage of RS lies in its potential use as a nondestructive analytical technique for the mineral composition of urinary stones.

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