X-Ray Fluorescence Analysis of Nonhomogeneous Materials by Δμ-Correction Method

1991 ◽  
Vol 35 (B) ◽  
pp. 749-754
Author(s):  
V. I. Karmanov ◽  
V. V. Zagorodny
Keyword(s):  
Reference Sample ◽  
Fluorescence Analysis ◽  
Correction Method ◽  
Electrode Coating ◽  
X Ray ◽  
Fundamental Parameters ◽  
Sample Composition ◽  
Combined Use ◽  
Welding Electrode ◽  
Excitation Conditions

AbstractThe fundamental parameters method (FPM) enables one to determine with high accuracy the chemical composition of homogeneous samples, having only one reference sample. However, the reference sample composition should be similar to that of the samples analyzed.The x-ray fluorescence analysis of multicomponent heterogeneous materials (ores, minerals, their mixtures, welding electrode coating mixtures, fluxes, etc.) is made by the Δμ-correction method based on the combined use of the fundamental and empirical correlations maintaining all the advantages of the FPM. Sample composition is calculated on the basis of the element intensities measured in the sample and in the reference specimen and is corrected for the disturbing effect of excitation conditions and heterogeneity as well as the calculated values of one of the fundamental parameters (μ1). At the preliminary stage of calibration, the coefficients are determined using regression and the absolute fundamental expression for the element fluorescence intensity.

Sorption of Se (IV) from aqueous solutions with subsequent determination by X-ray fluorescence analysis

2020 ◽  
Vol 86 (10) ◽  
pp. 5-9
Author(s):  
D. G. Filatova ◽  
A. A. Arkhipenko ◽  
M. A. Statkus ◽  
V. V. Es’kina ◽  
V. B. Baranovskaya ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Fluorescence Analysis ◽  
Standard Samples ◽  
Phase Contact Time ◽  
Sorbent Phase ◽  
X Ray ◽  
Fundamental Parameters ◽  
Inductively Coupled ◽  
Subsequent Determination

An approach to sorptive separation of Se (IV) from solutions on a novel S,N-containing sorbent with subsequent determination of the analyte in the sorbent phase by micro-x-ray fluorescence method is presented. The sorbent copolymethylenesulfide-N-alkyl-methylenamine (CMA) was synthesized using «snake in the cage» procedure and proven to be stable in acid solutions. Conditions for quantitative extraction of Se (IV) were determined: sorption in 5 M HCl or 0.05 M HNO3 solutions when heated to 60°C, phase contact time being 1 h. The residual selenium content in the solution was determined by inductively coupled plasma mass spectrometry (ICP-MS) using 82Se isotope. The absence of selenium losses is proved and the mechanism of sorption interaction under specified conditions is proposed. The method of micro-x-ray fluorescence analysis (micro-RFA) with mapping revealed a uniform distribution of selenium on the sorbent surface. The possibility of determining selenium in the sorbent phase by micro-RFA is shown. When comparing the obtained results with the results of calculations by the method of fundamental parameters, it is shown the necessity of using standard samples of sorbates to obtain correct results of RFA determination of selenium in the sorbent phase.

A method for determining the CEC and chemical composition of clays via XRF

Clay Minerals ◽  
2006 ◽  
Vol 41 (3) ◽  
pp. 717-725 ◽  
Author(s):  
S. Battaglia ◽  
L. Leoni ◽  
F. Sartori
Keyword(s):  
Matrix Effects ◽  
Fluorescence Analysis ◽  
Correction Method ◽  
Exchange Capacity ◽  
New Method ◽  
Chemical Compositions ◽  
Wet Chemistry ◽  
X Ray ◽  
Accuracy And Precision ◽  
Source Clays

AbstractA new method for determining the cation exchange capacity (CEC) of clays is proposed. The method is based on X-ray fluorescence analysis of natural and Ba-exchanged clays following the analytical procedure suggested by Franzini et al. (1975). This procedure, which utilizes powder pellets and is based on a full matrix correction method, is frequently applied in Earth Sciences laboratories for the routine analysis of minerals and rocks. For the analysis of Ba-exchanged clays, Franzini's procedure has been modified slightly to account for the contribution of Ba to matrix effects.The new method, which furnishes both the CEC and the chemical compositions of the whole natural clay samples, has been tested on the eight ‘Source Clays’ of The Clay Minerals Society. The results compare well with data reported in the literature and confirm the accuracy and precision of the method and make it a valid alternative to techniques based on wet chemistry, execution of which is usually more time-consuming and which often requires greater analytical skill.

Unification of “Standard Background” Technique using Scattered Radiation in X-Ray Fluorescence Analysis (XRF)

1991 ◽  
Vol 35 (B) ◽  
pp. 737-742
Author(s):  
V. I. Smolniakov
Keyword(s):  
Scattered Radiation ◽  
Fluorescence Analysis ◽  
Incoherent Scattering ◽  
Analysis Procedure ◽  
X Ray ◽  
Fundamental Parameters ◽  
Binary Approach ◽  
Primary Fluorescence ◽  
Analytical Practice ◽  
Matrix Influence

AbstractSome x-ray fluorescence - concentration relationships in the framework of XRF were researched. Fundamental calculation approaches for primary fluorescence and incoherent scattering were realized for evaluation of matrix influence. A new binary approach was produced for the cases considered, and its unification was related to the empirical and regression types of the “standard background” technique, widely used in the analytical practice of XRF. It is confirmed that application of the calculations by fundamental parameters (FP) in combination with the empirical approach allows the reduction of the set of standards (to as few as one) in the analysis procedure with wide variations in matrices and concentrations, without loss of accuracy.

Correction Method for Particle-Size Effect in XRF Analysis of Ore Slurries

1987 ◽  
Vol 31 ◽  
pp. 503-506
Author(s):  
Marek Lankosz
Keyword(s):  
Particle Size ◽  
Size Effect ◽  
Fluorescence Analysis ◽  
Particle Size Effect ◽  
Correction Method ◽  
Measured Concentration ◽  
X Ray ◽  
Weight Percentage ◽  
Xrf Analysis

In on–stream X–ray fluorescence analysis of ore slurries, the effects due to variation in the particle-size of solids can cause appreciable and sometimes major errors in the measured concentration of an element to be determined. Weight percentage of slurry ore grains with diameter smaller than 75 um (called later W75) is commonly used as measure of ore fineness and can be determined using particle-size analyzers. A method of correcting for W75 variaition is highly desireable, particularly in a case when high analysis accuracy is required for economical reasons.

Lama I - A General Fortrah Program for Quantitative X-ray Fluorescence Analysis

1976 ◽  
Vol 20 ◽  
pp. 515-528 ◽  
Author(s):  
Daniel Laguitton ◽  
Michael Mantler
Keyword(s):  
Input Data ◽  
Fluorescence Analysis ◽  
Matrix Correction ◽  
X Ray ◽  
Fundamental Parameters ◽  
The Matrix ◽  
Film Form

A comprehensive Fortran IV program designed to perform the matrix correction in x-ray fluorescence analysis is described. Specimens and standards can be in bulk or film form. All necessary fundamental parameters are provided by internal routines thereby requiring a minimum of input data.

Fundamental-Parameters Calculations on a Laboratory Microcomputer

1979 ◽  
Vol 23 ◽  
pp. 93-97 ◽  
Author(s):  
J. W. Criss
Keyword(s):  
Computer Program ◽  
Full Advantage ◽  
Data Base ◽  
Software Package ◽  
Fluorescence Analysis ◽  
Absorption Coefficients ◽  
Accurate Analysis ◽  
X Ray ◽  
Fundamental Parameters ◽  
Automatic Treatment

Fundamental-parameters calculations can be made on a laboratory microcomputer fo r automatic treatment of interelement absorption and enhancement effects in x-ray fluorescence analysis. A new software package, called XRF-11, uses an efficient combination of fundamental parameters and alpha factors to compensate for any lack of measured reference materials, while taking full advantage of whatever standards are available, even just pure elements. In many cases, one multi-element standard is enough for accurate analysis.The new XRF-11 software uses the same data base of absorption coefficients, fluorescence yields, etc. as the big-computer program NRLXRF, and combines theory with experiment in a consis tent way that is similar to, but more efficient than, the treatment used in NRLXRF.

Total reflection x-ray fluorescence analysis of light elements under various excitation conditions

1995 ◽  
Vol 24 (3) ◽  
pp. 137-142 ◽  
Author(s):  
C. Streli ◽  
P. Wobrauschek ◽  
W. Ladisch ◽  
R. Rieder ◽  
H. Aiginger
Keyword(s):  
Fluorescence Analysis ◽  
Total Reflection ◽  
Light Elements ◽  
X Ray ◽  
Excitation Conditions

The electronic age: energy-dispersive X-ray analysis and other modern techniques to the present and beyond

2014 ◽  
Vol 29 (2) ◽  
pp. 127-132 ◽  
Author(s):  
Michael Mantler
Keyword(s):  
Programming Languages ◽  
Field Effect Transistors ◽  
Fluorescence Analysis ◽  
Industrial Applications ◽  
100Th Anniversary ◽  
Low Noise ◽  
Energy Dispersive ◽  
X Ray ◽  
Fundamental Parameters ◽  
Related Data

This paper summarizes an oral presentation of the same title presented at the occasion of recognizing the “The 100th Anniversary of X-ray Spectroscopy” at DXC 2013. It gives an overview of the development in electronics with focus on (mainly) energy-dispersive X-ray detectors and related data processing. Naturally this has its origin in the early transistors and the first semiconductor junction detectors of the late 1940s. It was followed by refinement of semiconductor detector technology in general and particularly by the invention of Li-drifting and employment of low-noise field effect transistors until such devices matured sufficiently to be marketed by the late 1960s. Further improvement followed in resolution, speed, operability at room temperature, and development of junction arrays with imaging capabilities. An important aspect is the development of related software requiring affordable laboratory computers, programming languages, and databases of fundamental parameters. Today x-ray fluorescence analysis (and not only the energy-dispersive variant) is widely employed as an analytical tool for the traditional technical and industrial applications but notably also, at an expanding rate as well as variety, in other fields including environmental, medical, archaeological, space, arts, and many more.

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