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Related Concept Videos

Emission Spectra02:39

Emission Spectra

74.0K
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

445
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

Atomic Emission Spectroscopy: Instrumentation

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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.
960
Nuclear Overhauser Enhancement (NOE)01:07

Nuclear Overhauser Enhancement (NOE)

1.1K
Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

4.0K
Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
4.0K
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

3.2K
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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[Spatiotemporal Evolution and Driving Mechanism of Aerosol Optical Depth in the Ebinur Lake Basin].

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Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces
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[Aerosol Optical Properties over the Ebinur Region].

Zhe Zhang1,2, Jian-Li Ding1,2, Jin-Jie Wang1,2

  • 1Key Laboratory of Smart City and Environment Modelling of Higher Education Institute, College of Resources and Environment Science, Xinjiang University, Urumqi 830046, China.

Huan Jing Ke Xue= Huanjing Kexue
|October 30, 2020
PubMed
Summary
This summary is machine-generated.

Dust aerosols significantly impact aerosol optical depth (AOD) in Jinghe County, with spring experiencing the most intense AOD due to dust input from prevailing winds. Seasonal variations show higher AOD in spring, influenced by coarse particles and weather conditions.

Keywords:
Angström wavelength exponentEbinur Lake regionaerosol optical depthaerosol optical propertiessun photometer

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Experimental Protocol to Investigate Particle Aerosolization of a Product Under Abrasion and Under Environmental Weathering
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Experimental Protocol to Investigate Particle Aerosolization of a Product Under Abrasion and Under Environmental Weathering
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Area of Science:

  • Atmospheric Science
  • Environmental Science
  • Remote Sensing

Context:

  • Understanding salt dust transport to Ebinur Lake requires analyzing aerosol properties in Jinghe County.
  • A CE-318 sun photometer station provided data for aerosol optical depth (AOD) and Angström exponent (α) analysis in 2019.

Purpose:

  • To quantitatively evaluate aerosol concentration and characteristics in Jinghe County.
  • To analyze the seasonal variations and daily patterns of AOD and α.

Summary:

  • AOD peaked between 12:00-14:00 daily, inversely related to α. Seasonal AOD followed spring > summer > autumn, while α showed summer > autumn > spring.
  • Spring exhibited intense AOD fluctuations, larger particle sizes, and greater sensitivity to wind and humidity. Dust input during gales was the primary driver of high spring AOD.
  • Aerosols transitioned from coarse to fine modes from spring to autumn. Temperature influenced diffusion, but dust aerosols were the main AOD determinant, not small particles or moisture absorption.

Impact:

  • Provides crucial data for modeling salt dust transport and deposition processes affecting Ebinur Lake.
  • Highlights the significant role of dust aerosols and meteorological factors in regional air quality.
  • Informs environmental management strategies for mitigating dust pollution and its impacts.