EDXRF Determination of Major and Minor Elements in Compound Fertilizers

1984 ◽  
Vol 28 ◽  
pp. 215-220
Author(s):  
Leif Højslet Christensen ◽  
Leif Rasmussen
Keyword(s):  
Sample Preparation ◽  
Unique Solution ◽  
Fundamental Parameter ◽  
Fluorescence Technique ◽  
Matrix Correction ◽  
X Ray ◽  
Minor Elements ◽  
Elemental Analyses ◽  
Precision And Accuracy

AbstractThe combination of the energy-dispersive x-ray fluorescence technique and a backscatter/fundamental parameter-based matrix correction approach provides a new and unique solution to elemental analyses of fertilizers. This is demonstrated by means of results obtained for three reference materials and a range of in-house fertilizers. The results further demonstrate problems of sample preparation as well as the precision and accuracy of the method.

The Determination of Quartz in Perlite by X-ray Diffraction

1989 ◽  
Vol 33 ◽  
pp. 493-497 ◽  
Author(s):  
R. D. Hamilton ◽  
N. G. Peletis
Keyword(s):  
Detection Limit ◽  
Sample Preparation ◽  
Accurate Determination ◽  
Analytical Techniques ◽  
Crystalline Silica ◽  
X Ray Diffraction ◽  
X Ray ◽  
Precision And Accuracy ◽  
Improved Technique

AbstractIARC's designation of crystalline silica as a “probable carcinogen” triggered the requirement to label products containing greater than 0.1 % crystalline silica. For perlite and other materials which may contain crystalline silica in levels close to 0.1% an accurate determination is critical from both legal and marketing considerations.Existing analytical techniques for the determination of crystalline silica at levels of less than 1.0% were found to be inadequate to meet the new requirements. An improved technique based on x-ray diffraction has been developed specifically to analyze perlite for crystalline silica, which occurs largely in the form of quartz, at the 0.1%. level. The technique employs long counting times and improved sample preparation and mounting to increase both precision and accuracy, and to lower the detection limit to less than 0.1%.The technique was tested on a large number of samples from a variety of sources and proven to give excellent results for all types of expanded perlites and perlite ores. The procedures developed are applicable to a wide variety of materials in addition to perlite.

An Improved Sample Preparation and Analysis Technique for the Determination of Minor Elements in Catalytic Materials by Radio-Isotope Induced X-Ray Fluorescence

1980 ◽  
Vol 24 ◽  
pp. 393-398 ◽  
Author(s):  
John J. LaBrecque
Keyword(s):  
Sample Preparation ◽  
Standard Procedure ◽  
Internal Standard ◽  
X Ray ◽  
Minor Elements ◽  
Catalytic Materials ◽  
Cobalt Nickel ◽  
Analysis Technique ◽  
The Matrix

SummaryAn improved method for sample preparation and determination of minor elements in catalytic materials by radioisotope induced X-ray fluorescence is presented. The sample preparation is simple and rapid, it utilizes both and internal standard procedure as well as a thin film technique. Synthetic standards are prepared simply by mixing thoroughly the appropriate amounts of the elements of interest as their respective oxides with the matrix and the internal standard. The above standards are used to calculate the relative-fluorescence ratio factors (FJL) for each element of interest relative to the internal standard.Some of the different types of deviations (sample preparation, standard counting, instrumental, etc) will be shown for typical determinations applying experimental methods. Finally the application of this technique for the determination of Cobalt, Nickel, Molybdenum, Platinum and Palladium in catalytic materials is presented.

Quantitative Energy Dispersive X-Ray Flourescence Analysis of Low Alloy Steel by Regression and Modified Fundamental Parameter Techniques

2012 ◽  
Vol 620 ◽  
pp. 480-485
Author(s):  
Yusoff M.S. Meor ◽  
Muslimin Masliana ◽  
Paulus Wilfred
Keyword(s):  
Quantitative Analysis ◽  
Alloy Steel ◽  
Pure Metal ◽  
Fundamental Parameter ◽  
Low Alloy Steel ◽  
Fast Analysis ◽  
X Ray ◽  
Minor Elements ◽  
Edxrf Analysis

EDXRF analysis provides several important advantages such as simultaneous determination of the elements present, analyses of wide concentration ranges, and fast analysis with no sample preparation. The paper relates a comparative quantitative analysis using regression and modified Fundamental Parameter Technique FPT methods in the determination of minor elements present in low alloy steel. Regression was developed by plotting calibration graphs using low alloy reference standards while the modified FPT method involves incorporation of pure metal spectrum to the existing equation to improve on the accuracy of the analysis. Discrepancy tests carried out for the two methods showed that the error ranges were 0.3-6.5% and 1.2-7.9% for regression and modified FPT analyses, respectively. This makes the FPT method more acceptable for quantitative analysis of elements present in low alloy steel.

Synthesis of 4-(3-coumarinyl)-3-benzyl-4-thiazolin-2-one 4-methylbenzylidenehydrazone and determination of the isomeric structure by X-ray analysis

2003 ◽  
Vol 218 (12) ◽  
Author(s):  
Süheyla Özbey ◽  
Nilgün Karalı ◽  
Aysel Gürsoy
Keyword(s):  
Single Crystal ◽  
Diffraction Analysis ◽  
Spectral Data ◽  
X Ray Diffraction ◽  
X Ray ◽  
Isomeric Structure ◽  
Elemental Analyses

AbstractIn this study 4-(3-coumarinyl)-3-benzyl-4-thi azolin-2-one 4-methylbenzylidenehydrazone 3 was synthesised. An independent proof of the thiazolylhydrazone structure of 3 was achieved by single crystal X-ray diffraction analysis. Elemental analyses and spectral data (IR,

Determination of the crystal structure of magnesium perchlorate hydrates by X-ray powder diffraction and the charge-flipping method

2010 ◽  
Vol 66 (6) ◽  
pp. 579-584 ◽  
Author(s):  
Kevin Robertson ◽  
David Bish
Keyword(s):  
Crystal Structures ◽  
Powder Diffraction ◽  
Fundamental Parameter ◽  
Magnesium Perchlorate ◽  
Space Group ◽  
X Ray ◽  
Partial Pressures ◽  
Dehydration Reactions

X-ray powder diffraction (XRD) data were used to solve the crystal structures of phases in the magnesium perchlorate hydrate system, Mg(ClO4)2·nH2O (n = 4, 2). A heating stage and humidity generator interfaced to an environmental cell enabled in-situ XRD analyses of dehydration reactions under controlled temperatures and partial pressures of H2O (P_{{\rm H}_2{\rm O}}). The crystal structures were determined using an ab initio charge-flipping method and were refined using fundamental-parameter Rietveld methods. Dehydration of magnesium perchlorate hexahydrate to tetrahydrate (348 K) results in a decrease in symmetry (space group = C2), where isolated Mg2+ cations are equatorially coordinated by four H2O molecules with two [ClO4]− tetrahedra at the apices. Further dehydration to the dihydrate (423 K) leads to bridging of the isolated packets to form double corner-sharing chains of octahedra and polyhedra (space group = C2/m).

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