Time-resolved monitoring of polycyclic aromatic hydrocarbons adsorbed on atmospheric particles

TL;DR

This study introduces a real-time single-particle fluorescence spectrometer to monitor PAHs on atmospheric particles, revealing their dynamic behavior and aging process in the environment.

Contribution

The paper presents a novel real-time monitoring technique for PAHs on atmospheric particles, enabling analysis of their physicochemical changes over time.

Findings

Distinguished background emissions from traffic peaks.

Tracked particle aging through fluorescence wavelength shifts.

Provided real-time insights into atmospheric particle dynamics.

Abstract

Real-time monitoring of individual particles from atmospheric aerosols was performed by means of a specifically developed single-particle fluorescence spectrometer (SPFS). The observed fluorescence was assigned to particles bearing polycyclic aromatic hydrocarbons (PAH). This assignment was supported by an intercomparison with classical speciation on filters followed by gas chromatography-mass spectrometry (GC-MS) analysis. As compared with daily-averaged data, our time resolved approach provided information about the physicochemical dynamics of the particles. In particular, distinctions were made between background emissions related to heating, and traffic peaks during rush hours. Also, the evolution of the peak fluorescence wavelength provided an indication of the aging of the particles during the day.