Related Experiment Video
Updated: Feb 8, 2026
08:33
Use of Capillary Aerosol Generator in Continuous Production of Controlled Aerosol for Non-Clinical Studies
Published on: April 12, 2022
4.0K
[Marine Aerosol Using On-board Aerosol Mass Spectrometry]
Jin-Pei Yan1,2, Li-Qi Chen1,2, Qi Lin1,2
1Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China.
Huan Jing Ke Xue= Huanjing Kexue
|July 3, 2018
Summary
Marine aerosols over the Southeast China Sea were analyzed. Coastal aerosols stemmed from industry, while open-sea aerosols originated from marine biological sources, indicating mixed pollution influences.
Area of Science:
- Atmospheric Chemistry
- Marine Science
- Aerosol Science
Context:
- Marine aerosols play a crucial role in Earth's climate system.
- Understanding aerosol composition is vital for air quality and climate modeling.
- The Southeast China Sea is a region with significant anthropogenic and marine influences.
Purpose:
- To investigate the chemical composition and size distribution of marine aerosols.
- To identify the sources and characteristics of aerosol particles in the Southeast China Sea.
- To differentiate between anthropogenic and marine-based aerosol contributions.
Summary:
- Real-time measurements of marine aerosols were conducted using a signal particle aerosol mass spectrometer (SPAMS).
- Particle number concentration decreased with distance from the coast.
- Coastal aerosols were dominated by industrial emissions (vessel, traffic, coal), while open-sea aerosols showed characteristics of marine biological sources (e.g., high Na+, MSA-, CN-).
- Aerosol particles exhibited a peak diameter of 0.5 μm, with most in the 0.2–0.8 μm range.
- Distinct ion spectra were observed for coastal (high EC, K+, HSO4-) and open-sea (high Na+, MSA-, CN-, O-, HSO4-) aerosols.
Impact:
- Provides insights into the complex interplay of anthropogenic and marine sources affecting air quality.
- Contributes to a better understanding of aerosol formation and transformation processes in a dynamic marine environment.
- Highlights the need for integrated pollution control strategies considering both land-based and marine emissions.
Related Concept Videos
01:19Mass Spectrometry: Overview
9.0K
Mass spectrometry is an analytical technique used to determine the molecular mass and molecular formula of a compound. The basic principle of mass spectrometry is to generate ions from the analyte molecule and measure these ion abundances against their molecular mass. One common type of ionization, known as electron ionization or EI, bombards the analyte molecules in the gas phase with high-energy electron beams. The electron beams displace an electron from the molecule and leave behind a...
9.0K
01:21Tandem Mass Spectrometry
2.5K
Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
2.5K
01:13Mass Spectrometry: Isotope Effect
4.3K
Most elements exist in nature as a mixture of isotopes. The isotopes differ in weight due to their respective number of neutrons. The molecular weight of a molecule is different depending on the specific isotope of its elements involved. As a result, the mass spectrum of the molecule exhibits peaks from the same fragment at multiple positions. The positions of these mass signals depend on the mass differences between isotopes. Furthermore, the intensity of these signals is dependent on the...
4.3K
01:15Mass Spectrometry of Amines
5.4K
In mass spectroscopy, amines undergo fragmentation to give parent ions with odd molecule weights. This observed mass spectrum follows the nitrogen rule; a molecule with an odd number of nitrogen atoms produces a molecular ion with an odd molecular weight. Amines undergo fragmentation through α cleavage, producing nitrogen-containing cations—iminium ions—and alkyl radicals. Mass spectra of aromatic and cyclic aliphatic amines exhibit strong molecular ion peaks, but acyclic...
5.4K
01:21Chemical Ionization (CI) Mass Spectrometry
1.6K
The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
1.6K
00:59Mass Spectrometry: Alkene Fragmentation
3.7K
Alkenes lose one electron from the unsaturated π bond upon ionization and form stable molecular ions. Further fragmentation of alkenes occurs through three different reaction pathways. The most prominent fragmentation is the cleavage at the allylic position. The resultant allylic carbocation is resonance stabilized. In the mass spectra of terminal alkenes, this fragment appears at a mass-to-charge ratio of 41. In the internal alkenes, where there are two choices of allylic cleavage, the...
3.7K