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Related Concept Videos

Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
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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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Strong constraints on aerosol-cloud interactions from volcanic eruptions.

Florent F Malavelle1, Jim M Haywood1,2, Andy Jones2

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Large volcanic eruptions, like the 2014-2015 Holuhraun eruption, offer insights into aerosol-cloud interactions. This study found aerosols primarily reduced cloud droplet size, causing cloud brightening and radiative forcing, but did not significantly alter other cloud properties.

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Area of Science:

  • Atmospheric Science
  • Climate Science
  • Earth Science

Background:

  • Aerosols significantly influence climate by interacting with clouds, but their precise impact remains uncertain.
  • Volcanic eruptions provide natural experiments to study aerosol-cloud interactions and their climatic effects.

Purpose of the Study:

  • To quantify the impact of aerosols from the 2014-2015 Holuhraun volcanic eruption on cloud properties and radiative forcing.
  • To reduce uncertainties in climate projections by examining aerosol indirect effects on clouds.

Main Methods:

  • Analysis of cloud properties and radiative forcing following the massive 2014-2015 fissure eruption in Holuhraun, Iceland.
  • Utilizing the eruption as a natural experiment to observe aerosol-cloud interactions.

Main Results:

  • The eruption led to a reduction in liquid cloud droplet size, consistent with theoretical expectations.
  • Observed cloud brightening and a global-mean radiative forcing of approximately -0.2 W/m² during September-October 2014.
  • No discernible impact on other cloud properties such as cloud amount or cloud liquid water path was detected.

Conclusions:

  • Cloud systems exhibit resilience to aerosol changes, with indirect effects being well-buffered.
  • The findings help refine climate models by ruling out those with excessive liquid-water-path responses to aerosols.
  • This research reduces uncertainties in climate projections related to aerosol-cloud interactions.