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Related Concept Videos

Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

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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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Instrument Calibration01:12

Instrument Calibration

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Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
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An analytical balance measures mass and requires regular calibration to...
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Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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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 Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

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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.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
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Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

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Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
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Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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Dependence of Laser-induced Breakdown Spectroscopy Results on Pulse Energies and Timing Parameters Using Soil Simulants
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Self-absorption correction method for one-point calibration laser-induced breakdown spectroscopy.

Zhenlin Hu, Junfei Nie, Zhiyong Ouyang

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    |December 23, 2022
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    Summary
    This summary is machine-generated.

    A new self-absorption correction (SAC) method improves one-point calibration laser-induced breakdown spectroscopy (OPC-LIBS) accuracy by addressing self-absorption effects. This technique enhances quantitative analysis of elements in titanium alloys without needing to calculate the self-absorption coefficient.

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    Area of Science:

    • Analytical Chemistry
    • Spectroscopy
    • Materials Science

    Background:

    • One-point calibration laser-induced breakdown spectroscopy (OPC-LIBS) offers improved quantitative accuracy over calibration-free LIBS (CF-LIBS).
    • Self-absorption is a significant factor limiting the accuracy of OPC-LIBS analysis.
    • Existing methods for self-absorption correction can be complex or require coefficient calculations.

    Purpose of the Study:

    • To develop and validate a novel self-absorption correction (SAC) method for OPC-LIBS.
    • To enhance the accuracy of quantitative elemental analysis using OPC-LIBS.
    • To provide a simpler SAC method that avoids calculating the self-absorption coefficient.

    Main Methods:

    • A new algorithm-based self-absorption correction (SAC) method was developed for OPC-LIBS.
    • The SAC method was applied to determine Ti, V, and Al elements in two titanium alloy samples.
    • Performance was evaluated by comparing results from classical OPC-LIBS and the SAC-enhanced OPC-LIBS.

    Main Results:

    • The SAC method effectively corrected for self-absorption effects in OPC-LIBS.
    • Average relative errors (AREs) for elemental determination in titanium alloys were reduced.
    • AREs decreased from 8.78% and 9.28% to 8.07% and 7.56% for the two samples, respectively.

    Conclusions:

    • The proposed SAC method is effective in improving the accuracy of OPC-LIBS.
    • This method offers a practical solution for mitigating self-absorption in LIBS analysis.
    • The SAC method enhances the reliability of quantitative elemental analysis in materials like titanium alloys.