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Atomic Absorption Spectroscopy: Lab01:21

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For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Atomic Emission Spectroscopy: Instrumentation01:22

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Atomic Absorption Spectroscopy: Interference01:25

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Area of Science:

  • Materials Science
  • Metallurgy
  • Analytical Chemistry

Background:

  • Accurate carbon composition measurement in alloys is crucial for material properties.
  • Current detector systems face limitations due to carbon evaporation as clustered ions, causing detector pile-up and multi-hit events.
  • This phenomenon leads to inaccuracies in carbon composition analysis.

Purpose of the Study:

  • To investigate methods for improving the accuracy of carbon composition measurement in alloys.
  • To understand and mitigate the effects of carbon ion clustering and detector pile-up.
  • To evaluate the performance of newer generation atom probe instruments regarding carbon analysis.

Main Methods:

  • Positioning a grid behind the local electrode in an atom probe instrument.
  • Reducing the detector efficiency from 52% to 7% to minimize multi-hit events.
  • Analyzing carbon composition in carbide precipitates in steel and other alloys.

Main Results:

  • The study confirmed preferential loss of carbon due to detector pile-up.
  • Implementing a grid significantly reduced the fraction of multi-hit events.
  • Newer commercial atom probe instruments showed a higher discrepancy in carbon composition compared to older generations.
  • This discrepancy may stem from altered laser-matter interactions affecting metal ion detection in multi-hit events.

Conclusions:

  • Detector pile-up significantly impacts the accuracy of carbon composition measurements in alloys.
  • A grid-based approach can effectively reduce multi-hit events and improve carbon analysis accuracy.
  • Further investigation is needed to understand the discrepancies observed in newer atom probe generations and optimize their performance for carbon analysis.