X-ray fluorescence spectroscopic analysis of bromine in pharmaceutical formulations

1991 ◽  
Vol 56 (11) ◽  
pp. 2229-2233 ◽  
Author(s):  
Maria Augusta Raggi ◽  
Federico Lucchini ◽  
Paolo Da Re
Keyword(s):  
Fluorescence Spectroscopy ◽  
Matrix Effect ◽  
Spectroscopic Analysis ◽  
High Reliability ◽  
Internal Standard ◽  
Pharmaceutical Formulations ◽  
Accurate Method ◽  
Solid Samples ◽  
X Ray

A fast and accurate method is proposed for the determination of bromine in pharmaceutical formulations. The method is based on the application of X-ray fluorescence spectroscopy to solid samples and can be used for the assay of total bromine in various chemical media. It has high reliability provided that the appropriate matrix effect correction is employed, through the use of the scattered W-line from the X-ray tube as an internal standard.

Determination of Certain Noble Metals in Solution by Means of X-ray Fluorescence Spectroscopy. 2. Determination of Palladium, Rhodium, and Ruthenium

1966 ◽  
Vol 20 (4) ◽  
pp. 247-250 ◽  
Author(s):  
F. T. Wybenga ◽  
A. Strasheim
Keyword(s):  
Fluorescence Spectroscopy ◽  
Noble Metals ◽  
Internal Standard ◽  
X Ray ◽  
Coefficients Of Variation

Methods are described for the determination of palladium, rhodium, and ruthenium in matte solutions by means of x-ray fluorescence. The best results for palladium determinations were obtained using background measurements to calculate absorption effects. Palladium was used as a variable internal standard for the determination of rhodium and ruthenium. Coefficients of variation of the order of 1% were obtained throughout.

Determination of Rubidium in Cesium Metal by X-Ray Fluorescence Spectroscopy

1964 ◽  
Vol 8 ◽  
pp. 443-447
Author(s):  
Roger D. Laib
Keyword(s):  
Fluorescence Spectroscopy ◽  
Coefficient Of Variation ◽  
Alkali Metals ◽  
Molybdenum Trioxide ◽  
Internal Standard ◽  
The Other ◽  
X Ray ◽  
Analytical Curve ◽  
Good Agreement

AbstractA rapid method for the determination of rubidium in cesium metal by X-ray fluorescence is described. Cesium metal is converted to the chloride, and pellets are pressed with molybdenum trioxide as an internal standard. The rubidium to molybdenum intensity ratio is used to eliminate the effect of small amounts of the other alkali metals. The analytical curve is linear from 0.05 to 15% rubidium, which covers the range of samples normally encountered. Rubidium can be determined with a coefficient of variation of 1.3% in this range. Good agreement was shown with results obtained by flame photometry.

scholarly journals Square-wave voltammetric determination of rutin in pharmaceutical formulations using a carbon composite electrode modified with copper (II) phosphate immobilized in polyester resin

2012 ◽  
Vol 48 (4) ◽  
pp. 639-649 ◽  
Author(s):  
Kellen Heloizy Garcia Freitas ◽  
Orlando Fatibello-Filho ◽  
Ivanildo Luiz de Mattos
Keyword(s):  
Modified Electrode ◽  
Composite Electrode ◽  
Polyester Resin ◽  
Pharmaceutical Formulations ◽  
Carbon Composite ◽  
X Ray ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Carbon Composite Electrode

A carbon composite electrode modified with copper (II) phosphate immobilized in a polyester resin (Cu3(PO4)2-Poly) for the determination of rutin in pharmaceutical samples by square-wave voltammetry is described herein. The modified electrode allows the determination of rutin at a potential (0.20 V vs. Ag/AgCl (3.0 mol L-1 KCl)) lower than that observed at an unmodified electrode. The peak current was found to be linear to the rutin concentration in the range from 9.9 × 10-8 to 2.5 × 10-6 mol L-1, with a detection limit of 1.2×10-8 mol L-1. The response of the electrode was stable, with no variation in baseline levels within several hours of continuous operation. The surface morphology of the modified electrode was characterized by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) system. The results obtained are precise and accurate. In addition, these results are in agreement with those obtained by the chromatographic method at a 95% confidence level.

Quantitative Determination of some Carbonate Minerals in Greenschist Facies Meta-volcanic Rocks

1972 ◽  
Vol 9 (1) ◽  
pp. 36-42 ◽  
Author(s):  
Calvert C. Bristol
Keyword(s):  
Standard Deviation ◽  
Quantitative Determination ◽  
Volcanic Rocks ◽  
Internal Standard ◽  
Greenschist Facies ◽  
Carbonate Mineral ◽  
Mineral Contents ◽  
X Ray ◽  
Fine Grained

X-ray powder diffraction methods, successful in quantitative determination of silicate minerals in fine-grained rocks, have been applied to the determination of calcite, dolomite, and magnesite in greenschist facies meta-volcanic rocks. Internal standard graphs employing two standards (NaCl and Mo) have been determined.Carbonate mineral modes (calcite and dolomite) for 6 greenschist facies meta-volcanic rocks obtained by the X-ray powder method have been compared to normative carbonate mineral contents calculated for the same rocks. This comparison showed a maximum variation of 7.7 wt.% between the X-ray modes and the normative carbonate mineral contents of the rocks. Maximum standard deviation for the X-ray modes of these rocks was equivalent to 4.4 wt.%.

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