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Chemical Analysis of metal samplesusing
Optical Emission Spectroscopy (OES)
Glen ThieleSpectrosource Pty Ltd
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What is Optical emission spectroscopy (OES) also known as Atomic emission spectroscopy (AES)?
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Aggregate state of matter
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Atomic physics – How photons are emitted
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Optical emission Spectrometers
ICP OES
Arc/Spark OES
LIBS OES
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Why Use Spark OES Analysis?
•Most widely used, reliable and reproducible metal analysis technique.
•Wide choice of instruments.
•Excellent LOD
•CCD based spectrometers allow a high number of elements and bases.
•Detection of N is possible with high end portable and high end laboratory spectrometers.
•Detection of O is possible with high end laboratory spectrometers.
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PMT based Spark OES architecture
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CCD based Spark OES architecture
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Spark Stand architecture
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Typical spark sequence
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Grating propertiesPrism:
• non-linear refraction
• affected by temperature
due to influence of
medium density
Grating:
• linear diffraction
• different orders
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Reciprocal dispersion as criteria of line separation
500
750
1000[mm]
diameters of
Rowland circuit
lines/mm
focal length [mm]
3600
500
0,51
2400
750
0,52
1800
1000
0,51reciprocal dispersion
[nm/mm]
center
entrance slit
area for
detectors
grating
3600 grooves/mm grating
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Spark OES Spectrum 130nm – 800nm
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Calculation of results from Calibration Curve
result comparison to previouslymeasured set of calibration samples
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Emission spectrometry is a relative measurement method
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Recalibration, Standardization or Drift correction
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Type Calibration
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Illustration of exaggerated concentration error Δ in a calibration curve where Type calibration correction can be used to improve accuracy.
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Measurement accuracy and reproducibility
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The analytical Process
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Sample taking Sample preparation Chemical analysisSpectrosource Pty Ltd copyright 2019
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Type Calibration and measure program
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Material Data Base / Grade Table
double click
• software compares analysis results with
element concentration ranges and
reports grade maches
• virtually unlimited material data entries
• international material standards as well
as customised data base can be loaded
• Specific material data base can be
linked to a measuring program
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Thank you. For more information or feedback contact Glen Thiele
mobile: 0420323577email: [email protected]
• References
• (1) V. Thomsen, Modern Spectrochemical Analysis of Metals: An Introduction for Users of Arc/Spark Instrumentation (ASM International, Materials Park, Ohio, 1996).
• (2) Power Point Presentations – definitions and images: Belec Spectrometrie Opto-Electronik(2012 – 2016).
• (3) Various definitions and images: Wikipedia.
• (4) Melting Spectro Analysis Version 6: G Henderieckx – Gietech BV
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