Determination of effective atomic charge,extra-atomic relaxation and madelung energy in chemical compounds on the basis of X-ray photoelectron and auger transition energies

1988 ◽  
Vol 46 (2) ◽  
pp. 381-404 ◽  
Author(s):  
V.I. Nefedov ◽  
V.G. Yarzhemsky ◽  
A.V. Chuvaev ◽  
E.M. Trishkina
Author(s):  
Dana – Adriana ILUŢIU – VARVARA

The total quantity of wastes generated by metallurgical industry continues to grow. The storage of these wastes involves: occupying large areas of land; pollution potential of all environmental factors; expenses related to land storage etc. In order to eliminate the disadvantages entailed by the storage of metallurgical wastes one must find feasible solutions for their recycling or recovery. In this respect, a first step is their characterization. The paper presents an assessment of wastes recycling potential from metallurgical slag dumps. There were taken and chemically characterized the waste samples, in order to identify the compounds that have recycling potential. The determination of chemical composition of the waste samples was performed by spectrometric methods. The apparatus used was a spectrometer based on X-ray fluorescence. The chemical characterization is the most significant factor in determining the potential viability of recycling these wastes to recover metals. The results obtained from chemical characterization of these wastes, indicated the presence of the following compounds: magnesium oxide (MgO), calcium oxide (CaO), alumina (Al 2O3), total iron (Fe total), silicon dioxide (SiO2), manganese oxide (MnO), phosphorus pentoxide (P 2O5), vanadium pentoxide (V2O5), titanium dioxide (TiO2), chromium trioxide (Cr2O3), zinc oxide (ZnO) and lead oxide (PbO). Therefore, the identified chemical compounds have a major economic importance and through their recycling it is possible to save natural resources.


2020 ◽  
Vol 20 (4) ◽  
pp. 1011-1018
Author(s):  
ANTOANETA ENE ◽  
FLORIN SLOATA

This paper refers to the application of XRF method for the simultaneous determination of arsenic and selected metals from waste samples resulted from the dismanlting of distilleries in the perimeter of Azomures S.A., Mures County, Romania. The dismantling operation was carried out by a specialized Romanian company, and from this operation resulted several refractory construction wastes, such as sands with a very high content of arsenic and its chemical compounds. In order to determine the arsenic and other metals concentration, the energy-dispersive X-ray fluorescence (ED-XRF) spectrometric technique was employed. Application of the ED-XRF method was performed in an accredited laboratory for the determination of toxic substances from various samples, using a Genius portable XRF (p-XRF) spectrometer manufactured by Skyray Instruments Inc.


1992 ◽  
Vol 3 (4) ◽  
pp. 311-319 ◽  
Author(s):  
G. N. Dolenko ◽  
A. L. Litvin ◽  
V. P. Elin

2020 ◽  
Vol 232 ◽  
pp. 01006
Author(s):  
B. P. E. Tee ◽  
T. Kibédi ◽  
B. Q. Lee ◽  
M. Vos ◽  
R. du Rietz ◽  
...  

An energy correction method is described to account for the Breit and QED effects on Auger electrons and X-ray energies in the recently developed atomic relaxation model BrIccEmis. The results are compared with literature and new experimental data for Z = 52. Overall this improves the agreement of the calculated energies with the literature values. A new atomic radiation database NS_Radlist, will contain atomic transition energies from the BrIccEmis program with these energy corrections.


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