Page 17 - Shimadzu EDX-8100

Comprehensive Applications

Powders (Fine/Coarse Particles)ɹ−Qualification and Quantitation of Cement− Precious Stonesɹ−Differentiation of Natural Stones/Synthetic Stones−
The analysis of powder samples is a typical X-ray fluorescence spectrometry application. The samples can be press-formed or loose in the Various instruments are used in appraisals of precious stones, including not only general gemstone appraisal tools such as the stereoscopic
sample cell. microscope, but also various analytical instruments.
The following shows an example of the analysis of a cement standard substance using Na–U qualitative/quantitative analysis, which is the The energy dispersive X-ray fluorescence spectroscope (EDXRF) is also a necessary and indispensable instrument that enables quick,
standard method for powder analysis. Accurate quantitation was achieved without using standard samples. Performing measurements in a nondestructive composition analysis.
vacuum achieved sensitive measurements of light elements. A Shimadzu EDX-8100 was used in a composition analysis of rubies which are
commonly seen gemstones and strongly loved by many people, and effective results for distinguishing natural stones and synthetic stones and
identifying the geographic origin of natural stones were obtained.
Na-S K-Zn Sr

Natural stone(Colombia) Natural stone(Zambia) Synthetic stone

[cps/ A] Na-P [cps/ A] S-V [cps/ A] Cr-Rb [cps/ A] Sr-Ba
ʕSiKa 0.100 ʕFeKa

ʕMgKa 0.040

ʕVKa 0.075 0.004
ʕNaKa

0.050
Peak Pro le of Cement Standard Substance
ʕAlKa 0.020 ʕCrKa 0.002 ʕRhKa
1.00 ʕCsLb1 0.025 ʕFeKb ʕRhKb
ʕNaKa ʕMgKa ʕKKa ʕCaKa ʕCsLa ʕCrKb ʕNiKa ʕGaKa ʕRbKa

0.00 0.000 0.000 0.000
1.0 1.5 [keV] 4.0 5.0 [keV] 8.0 10.0 [keV] 20.0 22.0 [keV]
Sample Appearance
(Press formed at 250 kN for 30 s)
Emeralds

Element MgO AI2O3 SiO2 SO3 K2O CaO TiO2 Mn2O3 Fe2O3 ZnO SrO
Quantitation value 1.75 3.95 21.86 2.44 0.11 69.60 0.079 0.011 0.18 0.002 0.023
Standard value 1.932 3.875 22.38 2.086 0.093 67.87 0.084 0.0073 0.152 (0.001) (0.018)
Comparison of Quantitative Analysis Results and Standard Values by FP Method Units: wt% Natural stone(Colombia) Natural stone(Zambia) Synthetic stone
The Zambian stone has high contents of chromium and iron and a low content of vanadium in comparison with the Colombian stone.
Comparatively large amounts of sodium, magnesium, and potassium and trace amounts of rubidium and cesium were also detected in the Zambian stone, providing
one indicator for distinguishing this stone from the Colombian stone.

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