Soot particle agglomeration inlet (Spai) for enabling online chemical composition measurement of nanoparticles with the aerosol mass spectrometer

Sampsa Martikainen, Sanna Saarikoski, Paxton Juuti, Hilkka Timonen, Jorma Keskinen, Panu Karjalainen

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Nanoparticles are a topic of interest because of their effects on human health and the climate, but the current options for evaluating their chemical composition—one of the key properties that determine the mechanisms of these effects—remain very limited and often require long collection times. For example, the Soot Particle Aerosol Mass Spectrometer (SP-AMS) is an instrument that measures the chemical properties of particles in real time, but sampling loss fixes its lower particle size limit at 50 nm, thus excluding nanoparticles. Hence, we developed the Soot Particle Agglomeration Inlet (SPAI), an addition to the SP-AMS that enables it to detect and analyze nanoparticles by attaching them to the surfaces of artificially generated soot particles. We characterized and optimized the soot generation and the soot–nanoparticle agglomeration via laboratory testing and then assessed the SPAI’s performance using silver nanoparticles as the test aerosol. The SPAI increased the SP-AMS’s capability to detect the silver nanoparticles by 35 times, demonstrating its potential in resolving issues related to analyzing the chemical composition of nanoparticles, either as an enhancement of the SP-AMS or as an addition to other sample pretreatment systems.

Original languageEnglish
Article number200638
Number of pages8
JournalAerosol and Air Quality Research
Volume21
Issue number6
DOIs
Publication statusPublished - 2021
Publication typeA1 Journal article-refereed

Keywords

  • Aerosol characterization
  • Chemical composition
  • Nanoparticle

Publication forum classification

  • Publication forum level 1

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution

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