scholarly journals Effect of silicon on elemental composition determination of mineral samples

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 164-168
Author(s):  
M. B. Malysheva ◽  
◽  
D. S. Bernadskaia ◽  
E. B. Roshchin ◽  
I. R. Elizarova ◽  
...  
Keyword(s):  
Sample Preparation ◽  
Shelf Life ◽  
Elemental Composition ◽  
Silicon Content ◽  
Sample Solution ◽  
Polycondensation Reaction ◽  
Mineral Sample ◽  
Composition Determination ◽  
Silicic Acids

In this paper, the effect of the silicon content in the sample solution on obtaining reliable analysis results of macro- and microcomponents of a mineral sample is shown. The methods for sample preparation and analysis are proposed. It should be noted that it is important to take into account the polycondensation reaction of silicic acids, its effect on the shelf life of the sample without the formation of polymer forms.

scholarly journals Analysis of crude mineral sample preparation schemes

2020 ◽  
pp. 68-78
Author(s):  
Vladimir Z. Kozin ◽  
Keyword(s):  
Sample Preparation ◽  
Mass Fraction ◽  
Sample Mass ◽  
The Third ◽  
Multi Stage ◽  
Mineral Sample ◽  
Model Scheme ◽  
Paradoxical Growth ◽  
Selection Of

Introduction. Sample preparation schemes are multi-stage. Sample reduction in the process of preparation introduces extra inaccuracy in the result of sampling, consequently, sample preparation schemes inaccuracy should be calculated with further selection of its rational parameters. Research methodology is based on calculation by the formula of sample reduction random inaccuracy. Inaccuracy calculation of a sample preparation scheme. Calculation has been carries out of the scheme recommended by GOST 14180-80. Paradoxical growth of inaccuracy of sample preparation has been shown with ore homogeneity growth. Determination of sample mass by the stages of preparation. Standards and techniques of ore and nonferrous metals concentrates sampling for the creation of sample preparation schemes recommend finding the coefficient in minimum mass formula depending on the mass fraction variation coefficient in the sampled product. Sample preparation is carried out in laboratory conditions, and sample mass cannot depend on this coefficient of variation. Sample inhomogeneity in the laboratory depends only on the inhomogeneity of separate lumps of a sample. Sample inhomogeneity in the preparation laboratory is defined by lump dispersion, and the coefficient is the function of this dispersion, admissible inaccuracy of sample reduction and the dimensions of grain impregnations of the mineral which contains the analyte. 78 "Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal". No. 1. 2020 ISSN 0536-1028 For each factory, individual coefficient can be found, and sample masses can be calculated by the stages of preparation. Analysis of sample preparation schemes. Sample preparation scheme inaccuracy formula is given. Calculation and analysis of the model scheme of sample preparation according to GOST 14180-80 have shown that at the third crushing stage the sample is advisable to be crushed not up to 3, but up to 2 mm, and the recommended sample size at the final stage 8.08 hardly improves the result of preparation, that is why the previous recommendation of 0.1 mm can be used.

A Simple Multielement-Calibration System for Analysis of Minor and Major Elements in Minerals by Fluorescent X-Ray Spectrography

1961 ◽  
Vol 5 ◽  
pp. 389-404 ◽  
Author(s):  
Merlyn L. Salmon
Keyword(s):  
Sample Preparation ◽  
Preliminary Investigation ◽  
Major Elements ◽  
Calibration System ◽  
Simple Method ◽  
Maximum Information ◽  
X Ray ◽  
Mineral Sample ◽  
Trace Concentrations

AbstractTechniques of mineral analysis by fluorescent X-ray spectrography can generally be classified on the basis of (1) extensive sample preparation and simple instrumental examination, (2) simple sample preparation and extensive instrumental examination, (3) extensive processes for both, or (4) simple processes for both major phases of the technique. The latter type of technique is usually the most commensurate with the concept “maximum information with minimum effort.”Suitable analytical results with multielement calibration systems for random mineral samples can be obtained if there are valid considerations of the relevant absorption and enhancement effects or if the systems are based on general procedures to minimize absorption and enhancement effects. Preliminary investigation indicated that control of sample mass and use of thin films of the mineral sample is a convenient and simple method of minimizing absorption and enhancement effects.Successful application of thin-film samples with known masses in a multielement calibration system is highly dependent upon details of sample preparation and comprehensive studies of these details will be discussed.The calibration system is suitable for the determination of minor and major concentrations in the sample, but it is not recommended for determination of trace concentrations.

scholarly journals Portable X-ray fluorescence (pXRF) applications in tropical Soil Science

2017 ◽  
Vol 41 (3) ◽  
pp. 245-254 ◽  
Author(s):  
Bruno Teixeira Ribeiro ◽  
Sérgio Henrique Godinho Silva ◽  
Elen Alvarenga Silva ◽  
Luiz Roberto Guimarães Guilherme
Keyword(s):  
Elemental Composition ◽  
Chemical Properties ◽  
Tropical Soil ◽  
Soil Science ◽  
Soil Characterization ◽  
X Ray ◽  
Analytical Technique ◽  
Composition Determination ◽  
Physical And Chemical

ABSTRACT The X-ray fluorescence (XRF) is an analytical technique for determination of elemental composition of different materials. In soils, the XRF has many pedological, environmental and agronomic applications, mainly after the emergence of portable equipments (pXRF). This technique has been recently adopted and successfully used for soil characterization worldwide, but very rare works have been carried out in soils of developing countries. The soil characterization includes the complete elemental composition determination (nutrients, trace and rare-earth elements) and allows estimating some soil physical and chemical properties. In Brazil, this technique is still incipient, mainly the use of pXRF, however, it can greatly contribute to soil characterization in-field or in-lab conditions and also replacing methods of soil analyses considered non-environmentally friendly. This review summarizes the XRF technique including principles and the main applications of pXRF in soils highlighting its potential for tropical Soil Science.

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