IMPROVEMENT OF THE SAMPLE PREPARATION IN DETERMINATION OF THE MICROELEMENT COMPOSITION OF BROWN ALGAE USING X-RAY FLUORESCENCE ANALYSIS WITH TOTAL EXTERNAL REFLECTION

2017 ◽  
Vol 83 (12) ◽  
pp. 12-20
Author(s):  
A. V. Malkov ◽  
A. Yu. Kozhevnikov ◽  
T. M. Konstantinova ◽  
D. S. Kosyakov ◽  
A. E. Parshina
Keyword(s):  
Sample Preparation ◽  
Brown Algae ◽  
Fluorescence Analysis ◽  
Total External Reflection ◽  
X Ray ◽  
Microelement Composition

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.

Determination of the composition of binary chalcogenide glasses by X-ray fluorescence analysis

2010 ◽  
Vol 44 (1) ◽  
pp. 24-27 ◽  
Author(s):  
G. A. Bordovsky ◽  
A. V. Marchenko ◽  
P. P. Seregin ◽  
N. N. Smirnova ◽  
E. I. Terukov
Keyword(s):  
Chalcogenide Glasses ◽  
Fluorescence Analysis ◽  
X Ray

Measurement Of Relative X-Ray Intensity Ratios for Elements With Z=14 to 92 Using EDXRF Spectrometer

1993 ◽  
Vol 37 ◽  
pp. 697-709 ◽  
Author(s):  
Krassimir N. Stoev ◽  
Joseph F. Dlouhy
Keyword(s):  
Fluorescence Analysis ◽  
Radiative Transition ◽  
Published Data ◽  
Emission Rates ◽  
Experimental Physics ◽  
X Ray ◽  
Overlapped Peaks ◽  
Intensity Ratios ◽  
Atomic Structure Calculations

Nowadays x-ray fluorescence analysis is one of the major techniques for determination of trace elements. Vacuum operated Si (Li) .energy-dispersive x-ray spectrometers can analyze simultaneously up to 50 elements from Na (Z=11) to U (Z = 92) . Proper interpretation of the accumulated spectra requires correct solution of x-ray line overlap problems. In many cases knowledge of x-ray intensity ratios can make the procedure for resolving the overlapped peaks more reliable and reproducible. Measurements of radiative transition rates can also provide fundamental tests of theoretical atomic structure calculations. There are many other useful applications of x-ray emission rates in theoretical and experimental physics. On the other hand, there are differences in the published data, which suggests that x-ray intensity ratios are still not known with the necessary accuracy, and new measurements are useful and necessary.

Slope-Ratio Technique for the Determination of Trace Elements by X-Ray Spectroscopy: A New Approach to Matrix Problems

1968 ◽  
Vol 22 (4) ◽  
pp. 321-324 ◽  
Author(s):  
Frank Cuttitta ◽  
Harry J. Rose
Keyword(s):  
Trace Elements ◽  
Matrix Effects ◽  
Fluorescence Analysis ◽  
Slope Ratio ◽  
New Approach ◽  
X Ray ◽  
Standard Curve ◽  
Residual Matrix ◽  
Matrix Problems

A new approach to solving matrix problems in x-ray fluorescence analysis of trace elements has been applied to the determination of bromine in saline waters and zinc in silicates. The method requires no prior knowledge of the chemical composition of the sample. Marked matrix effects are minimized by dilution, and the problem of variable backgrounds due to residual matrix effects is solved by using a slope-ratio technique. In this proposed technique, the slope of a standard curve prepared from pure solutions is compared with that of spiked samples. The ratio of the slopes of these two curves permits the calculation of an adjusted background which does not significantly differ from that of an absorbent impregnated with the sample matrix free of the element sought. Experimental parameters concerning the technique are presented. The excellent agreement of the zinc and bromine data with analytical results obtained by more conventional methods suggests that the technique can be used for the determination of other trace constituents in geologic materials. Application of the slope-ratio technique to other modes of instrumental analysis appears feasible.

scholarly journals Evaluation of mineral fiber properties using x-ray fluorescence analysis and measurement of natural radioactivity

2018 ◽  
Vol 170 ◽  
pp. 03018 ◽  
Author(s):  
Andrey Medvedev ◽  
Ekaterina Bobrova ◽  
Alexey Poserenin ◽  
Ervand Zarmanyan
Keyword(s):  
Fluorescence Analysis ◽  
Mineral Wool ◽  
Factors Affecting ◽  
Mineral Fibers ◽  
X Ray ◽  
Fiber Properties ◽  
Building Systems ◽  
Heavy Metal Oxides

The article analyzes the factors affecting the longevity of insu-lating systems and the operational resistance of products based on mineral fibers. It is emphasized that the ratio of acid oxides contained in the charge to the main oxides is the main factor influencing the operational resistance of mineral fibers, as well as the energy intensity of their production. A hy-pothesis has been put forward and confirmed that the operational resistance of a fiber depends on the content of heavy metals (their oxides) in the ini-tial charge. Determination of the elemental composition of stone wool samples was carried out by X-ray fluorescence analysis. Conducted sam-ples with a different acidity module of the study, show, that the fibers are safe by radiation indices, and their operational resistance can be affected by heavy metal oxides. It is substantiated that the durability of building systems in which mineral wool products are used as thermal insulation is determined by the properties of mineral wool products, the literacy of de-sign solutions and the quality of installation. The properties of mineral wool products, including their operational resistance, depend on the prop-erties of mineral fibers and the observance of technological regimes both on the fact of the most complete curing of the binder and on the features of formation of the volume-oriented structure of the mineral wool carpet.

A green analytical method for the determination of Cu, Fe, Mn, and Zn in wheat flour using total reflection X-ray fluorescence

2018 ◽  
Vol 33 (7) ◽  
pp. 1264-1268 ◽  
Author(s):  
Ignacio Machado ◽  
Sebastián Mondutey ◽  
Natalia Pastorino ◽  
Valeria Arce ◽  
Mariela Pistón
Keyword(s):  
Sample Preparation ◽  
Wheat Flour ◽  
Analytical Method ◽  
Environmentally Friendly ◽  
Total Reflection ◽  
X Ray ◽  
Subsequent Determination ◽  
Environmentally Friendly Method

A simple, fast and environmentally friendly method for sample preparation and subsequent determination of minerals in wheat flour using TXRF.

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