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Related Concept Videos

Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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.
The atomizer used in AAS can be either a flame atomizer or an...
Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

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.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing nebulizer...
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

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,...
Atomic Absorption Spectroscopy: Overview01:27

Atomic Absorption Spectroscopy: Overview

Atomic absorption spectroscopy (AAS) is a technique used to analyze elements by measuring electromagnetic radiation (EMR) absorbed by atoms, which causes them to transition to a higher-energy orbit. The most crucial step in AAS is atomization, where the analyte is converted into gas-phase atoms, typically through a flame or furnace. Some of these atoms become thermally excited in the flame, while most remain in the ground state.
When irradiated by EMR of a particular wavelength, these...
¹H NMR Signal Integration: Overview00:58

¹H NMR Signal Integration: Overview

The intensity of a signal, which can be represented by the area under the peak, depends on the number of protons contributing to that signal. The area under each peak is shown as a vertical line called an integral, with the integral value listed under it, as seen in the proton NMR spectrum of benzyl acetate. Each integral value is divided by the smallest integral value to obtain the ratio of the number of protons producing each signal. The ratio reveals the relative number of protons and not...
Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

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.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...

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Measuring Dissolved Methane in Aquatic Ecosystems Using An Optical Spectroscopy Gas Analyzer
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Analysis of a point-source integrating-cavity absorption meter.

R A Leathers, T V Downes, C O Davis

    Applied Optics
    |March 21, 2008
    PubMed
    Summary
    This summary is machine-generated.

    A point-source integrating-cavity absorption meter (PSICAM) shows negligible scattering errors for ocean optics. Accurate fluid absorption measurements are possible with PSICAM, even with some source anisotropy.

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    Area of Science:

    • Ocean optics
    • Spectroscopy
    • Fluid dynamics

    Background:

    • Accurate measurement of fluid absorption is crucial for ocean optics.
    • Point-source integrating-cavity absorption meters (PSICAM) offer a potential method for such measurements.
    • Understanding performance limitations and error sources is essential for reliable data.

    Purpose of the Study:

    • To theoretically evaluate the performance of a point-source integrating-cavity absorption meter (PSICAM).
    • To quantify scattering errors and assess their impact on ocean optics applications.
    • To determine the sensitivity of PSICAM to wall reflectivity and source anisotropy.

    Main Methods:

    • Monte Carlo simulations were employed to model PSICAM performance.
    • Sensitivity analysis was conducted to identify key influencing parameters.
    • Error quantification was performed for scattering, wall reflectivity, and source anisotropy.

    Main Results:

    • Scattering errors were found to be negligible for most ocean optics applications.
    • PSICAM detector response is highly sensitive to wall reflectivity.
    • Accurate absorption measurements are achievable with proper reference solutions.
    • Moderate source anisotropy can be tolerated with correct detector placement.

    Conclusions:

    • PSICAM is a viable tool for fluid absorption measurements in ocean optics.
    • Careful selection of reference solutions and detector positioning are key for accuracy.
    • The method is robust against minor deviations in source isotropy.