Enhancement of the spectral selectivity of complex samples by measuring them in a frozen state at low temperatures in order to improve accuracy for quantitative analysis. Part II. Determination of viscosity for lube base oils using Raman spectroscopy

The Analyst ◽  
2013 ◽  
Vol 138 (5) ◽  
pp. 1515 ◽  
Author(s):  
Mooeung Kim ◽  
Hoeil Chung
Keyword(s):  
Raman Spectroscopy ◽  
Quantitative Analysis ◽  
Low Temperatures ◽  
Complex Samples ◽  
Base Oils ◽  
Spectral Selectivity ◽  
Improve Accuracy ◽  
Frozen State

Measurement of polyethylene pellets near the glass transition temperature to enhance Raman spectral selectivity among samples and improve accuracy for density determination

The Analyst ◽  
2015 ◽  
Vol 140 (6) ◽  
pp. 1906-1912 ◽  
Author(s):  
Saetbyeol Kim ◽  
Hideyuki Shinzawa ◽  
Hoeil Chung ◽  
Yukihiro Ozaki
Keyword(s):  
Raman Spectroscopy ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Effective Strategy ◽  
Density Determination ◽  
Spectral Selectivity ◽  
Improve Accuracy ◽  
Raman Spectral

A simple and effective strategy for improving the accuracy of the multivariate determination of polyethylene (PE) density using Raman spectroscopy has been demonstrated.

Chain Length Determination of Fatty Acids by Raman Spectroscopy

1973 ◽  
Vol 51 (23) ◽  
pp. 3901-3904 ◽  
Author(s):  
Charles H. Warren ◽  
Donald L. Hooper
Keyword(s):  
Fatty Acids ◽  
Raman Spectroscopy ◽  
Quantitative Analysis ◽  
Long Chain Fatty Acids ◽  
Qualitative And Quantitative Analysis ◽  
Qualitative And Quantitative ◽  
Odd Order ◽  
Length Determination ◽  
Long Chain

For saturated long chain fatty acids, as for hydrocarbons, the odd order "accordion mode" vibrations are Raman active. These "accordion mode" vibrations have been used to provide qualitative and quantitative analysis of mixtures of acids in the range C12–C24.

scholarly journals Quantitative analysis by Raman spectroscopy using potassium hexacyanoferrate (III) as an internal standard

2020 ◽  
pp. 13-16
Author(s):  
A. Y. Khrushchev ◽  
E. R. Akmaev ◽  
V. O. Bondarenko ◽  
A. E. Metlin
Keyword(s):  
Raman Spectroscopy ◽  
Quantitative Analysis ◽  
Laser Beam ◽  
Quantitative Determination ◽  
Internal Standard ◽  
Potassium Ferricyanide ◽  
Potassium Hexacyanoferrate ◽  
Hplc Assay ◽  
Metrological Requirements

In this article we proposed a method for quantitative determination of active substance in pharmaceuticals via Raman scattering using potassium ferricyanide as internal standard. We approved this method in ketoprophenum quantitative determination in drug for veterinary use “Ketojekt”. The calculation of metrological requirements of procedures are established proposed method of calibration. Either we demonstrated the focalisation factor of laser beam affects on the method reproducibility. The method provides a precise, rapid, convenient to quantitative analysis that is more effective than the standard HPLC assay.

Quantitative determination of titanium tetrachloride and dichloromethane by Raman spectroscopy using carbon disulfide as an internal standard

2020 ◽  
Vol 12 (7) ◽  
pp. 988-995
Author(s):  
Xiaoyan Xiang ◽  
Xianda He ◽  
Wentang Xia ◽  
Jianguo Yin ◽  
Xiaoli Yuan ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Quantitative Analysis ◽  
Quantitative Determination ◽  
Carbon Disulfide ◽  
Titanium Tetrachloride ◽  
Internal Standard ◽  
Peak Height ◽  
Peak Height Ratio ◽  
Height Ratio

Raman spectroscopy with an internal standard and peak height ratio was applied for the quantitative analysis of dichloromethane and titanium tetrachloride.

scholarly journals Determination of Volatile Terpenes in Coriander Cold Pressed Oil by Vacuum Assisted Sorbent Extraction (VASE)

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 884
Author(s):  
Henryk H. Jeleń ◽  
Monika A. Marcinkowska ◽  
Maria Marek
Keyword(s):  
Quantitative Analysis ◽  
Low Temperatures ◽  
Small Sample ◽  
Plant Oils ◽  
Optimal Parameters ◽  
Main Compound ◽  
Volatile Terpenes ◽  
Cold Pressed

Cold-pressed plant oils are of high interest to consumers due to their unique and interesting flavors. As they are usually only pressed at low temperatures and filtered, without further processing stages (as refining), they preserve their character that originates from the plant the oil was extracted from. Coriander cold pressed oil is gaining popularity as a novel product, obtained from its fruits/seeds; due to the high amount of terpenes, it has very characteristic flavor. A novel, vacuum-assisted sorbent extraction (VASE) method was used to extract terpenes from coriander cold pressed oil. Optimal parameters were determined. The profile of compounds extracted using VASE was compared with that of classic hydrodistillation method. Moreover, 17 monoterpene hydrocarbons and alcohols were identified with β-linalool as the main compound, followed by α-pinene, γ-terpinene, camphor, sylvestrene, β-pinene, and o-cymene. Differences were noted between profiles of terpenes after hydrodistillation and VASE extraction. For 8 out of 17 terpenes, VASE was used for their quantitative analysis. Regarding simplicity of the method, small sample requirement (200 mg) and short extraction time (5 min), VASE combined with GC/MS is well suited for characterization of terpenes in such matrix as plant oils.

An Improved Quantitative Image Analyser

1977 ◽  
Vol 35 ◽  
pp. 226-227
Author(s):  
J.P. Fallon ◽  
P.J. Gregory ◽  
C.J. Taylor
Keyword(s):  
Feature Extraction ◽  
Quantitative Analysis ◽  
Frequency Content ◽  
General Sense ◽  
Physical Measurements ◽  
Quantitative Image ◽  
Image Analyser ◽  
Automatic Methods ◽  
Quantitative Results

Quantitative image analysis systems have been used for several years in research and quality control applications in various fields including metallurgy and medicine. The technique has been applied as an extension of subjective microscopy to problems requiring quantitative results and which are amenable to automatic methods of interpretation.Feature extraction. In the most general sense, a feature can be defined as a portion of the image which differs in some consistent way from the background. A feature may be characterized by the density difference between itself and the background, by an edge gradient, or by the spatial frequency content (texture) within its boundaries. The task of feature extraction includes recognition of features and encoding of the associated information for quantitative analysis.Quantitative Analysis. Quantitative analysis is the determination of one or more physical measurements of each feature. These measurements may be straightforward ones such as area, length, or perimeter, or more complex stereological measurements such as convex perimeter or Feret's diameter.

Lateral resolution of the electron microbeam analysis

1978 ◽  
Vol 36 (1) ◽  
pp. 542-543
Author(s):  
H.J. Dudek
Keyword(s):  
Quantitative Analysis ◽  
Depth Resolution ◽  
Lateral Resolution ◽  
Cylindrical Particle ◽  
Correction Procedure ◽  
X Ray ◽  
Element Concentrations ◽  
Microbeam Analysis ◽  
The Matrix

The chemical inhomogenities in modern materials such as fibers, phases and inclusions, often have diameters in the region of one micrometer. Using electron microbeam analysis for the determination of the element concentrations one has to know the smallest possible diameter of such regions for a given accuracy of the quantitative analysis.In th is paper the correction procedure for the quantitative electron microbeam analysis is extended to a spacial problem to determine the smallest possible measurements of a cylindrical particle P of high D (depth resolution) and diameter L (lateral resolution) embeded in a matrix M and which has to be analysed quantitative with the accuracy q. The mathematical accounts lead to the following form of the characteristic x-ray intens ity of the element i of a particle P embeded in the matrix M in relation to the intensity of a standard S

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